JPS5985641A - Apparatus for measuring refractive index - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

The present invention relates to a refractive power all+determining device for determining the corrected refractive power of the eye to be examined by 1JI9. The device for measuring the corrected refractive power of the eye to be examined projects a refractive power test optotype onto the eye muscle of the examinee through a corrective optical system, and moves the corrective optical system according to the examinee's response. So-called subjective refractive power measurement to measure the appropriate corrective refractive power! The examiner can observe the refractive power test optotype projected on the fundus of the patient's eye at position A, and the system automatically detects the focus state and determines the appropriate corrective refractive power. ) is known. By the way, in this type of refractometer, accurate measurement results cannot be obtained unless the refractive power aV + distance between the constant optical system and the subject's eye is set to an appropriate value. It is something that cannot be done. Also. This operability! #1 has a different operation when measuring the refractive power of a normal eyeglass lens and when determining the refractive power of a contact lens. No. However, in conventional equipment, there are two types of illumination.
I can't find anything with a groove formed so that the distance is 1ζ (L is arbitrarily set?j), and for example, when setting the corrective refractive power for contact lenses as all+, the bridge positive refractive power II for eyeglass lenses is used.
An expedient measure has been taken in which the 411] constant result is processed by a microcomputer or the like and converted to 1j degrees of corrective refraction for contact lenses, without changing the fixed operating microscope part. However, it is not necessarily simple to provide means such as arithmetic processing by a microcomputer, and there has been a demand for a device that can easily set two or more types of operation. The present invention was made in response to such conventional demands, for example, a corrective refractive power of 81'l for eyeglass lenses.
It is an object of the present invention to provide a refractive power measuring device that has a simple configuration and can extremely easily set the working distance for measuring corrective refractive power for contact lenses. Hereinafter, an example in which the invention is applied to a subjective refractometer will be explained with reference to the drawings.
, E: An index for projecting an index for setting the positional relationship of the measuring optical system S for measuring the refractive power of 2 and the subject's eye E with respect to this 41g constant optical system S onto the subject 1IliilE1, E. Projection system l] and the eyes to be examined E1, E, :! It is roughly composed of an aiming system J for aiming at the Note that the suffix 1°2 attached to the reference numerals hereinafter refers to the right eye and the left eye, respectively, except for the explanation of the arrangement spacing of the optical system shown in FIGS. 2 and 3. First, to explain the 4111 constant optical system S in detail, the light source 1
The light passes through a condenser lens 2 and illuminates a refractive power testing optic 4m4 provided on a rotary plate 3. There are various types of optotypes 4 for detecting spherical power, cylindrical power, cylindrical axis, etc.; these are selected by rotation 4 of the rotating disk 3 and inserted into the optical path. Note that the light source 1, condensing lens 2, and rotating disk 3 are capable of `C8''JJ along the optical axis for near refraction atq, which will be described later. Also, the light of the optotype 4 or C] is transmitted through the first projection lens 5 to this lens 5.
The light passes through a pair of correcting optics KJ, which are provided behind the lens, for correcting spherical power, cylindrical power, cylindrical axis, etc. In the second correction optical system, +, 2 and 2 are arranged at symmetrical positions on both sides with the optical axis of the first projection lens 5 interposed therebetween, and these have optically the same configuration. Below, the corrective optical system K1 for right eye measurement is used as an example. To explain the details of 2, the correction optical system Kr is the first ? Ifj lens system 61, 2nd? iC Renren71. Third group lens system 81 first and second cylindrical lenses 91. ．． 91 and declination prism [11,]Oz1]]
, 100 J, and the spherical power can be corrected by moving the first group lens system 61 along the optical axis. Here, the third lens group 81 consists of two L-lens systems, and the cylindricity can be corrected by the first and second cylindrical lenses 91 and 91 sandwiched between these two lens systems. There is. And these two cylindrical lenses 91.93
are cylindrical lenses with the same absolute values of cylindricity and opposite signs, and each can be rotated around the optical axis.If both lenses 9 units and 100 units are rotated by the same angle in the same direction, the cylinder 1t+i+ When the lenses are rotated by the same angle in opposite directions, the cylindrical power is corrected. On the other hand, the lens 2 disposed behind the third lens group 8j
The two deflection prisms 1sIOx and 101 have a deflection amount that is symmetrical with respect to the vertical axis perpendicular to the optical axis, and these deflection prisms 10* and 101 are rotated around the optical axis by mutually opposite directions and the same angle. Accordingly, the horizontal prism value of the eye E1 to be examined can be corrected, and so-called skew correction can be performed. In addition, the deflection prism 10. The declination prisms 11+, , 11.1 arranged behind the declination prisms 101, 101 are optically rotated by 90'', and have the same configuration as -42. By rotating the direction and angle, the prism value in the vertical direction of the eye to be examined is obtained. In this way, the right eye measurement correction optical system 1 is configured to be able to independently correct the force 11 fold state such as spherical power, cylindrical power, cylindrical axis, prism value, etc., but the left eye d11] For corrective optical system:! can be explained in the same way, so I will omit the details. In addition, each corrective optical system has 1. ' = = test eye E1. In order to match the interpupillary distance of Ez+tllt, it is movable in parallel to the horizontal direction across the optical axis of the first projection lens 5. In this way, each light beam that has passed through the pair of corrective optical systems Kx, K, :+ is transmitted through the second projection lens 12, the half mirror 13, and the third
It reaches the subject's eyes Ex, E, and r via the projection lens 14 and the half mirror 15, and passes through the pupil of the subject's eye to form an image of the optotype 4 on the fundus of both eyes. In addition, the light beams that have passed through each of the corrective optical systems Kr and Kz are commonly relayed by a relay lens system I (composed of a second projection lens 12 and a third projection lens 14) to a double-wave optometry Ex,
E+z glasses-wearing position (l 2 mm from the front of Ilffi)
degree) to the corrective optical system: 1. 2 images are formed. In addition, when measuring the corrective refractive power for contact lens 1 to lens, test eye E1. The corneal apex position of E2 is set in the corrective optical system at a position where an image of +-, :x is formed. Therefore, 1. This is equivalent to placing the target 4 in front of the eyes, and the subject can standardize the image of the visual target 4 through the half mirror I5 in a state of natural vision. In this way, the subject looks directly at the optotype 4 in a state of natural vision and 1
The corrective optical system K 1 , K ? responds to the examiner until the optotype 1 appears properly. , the refractive power d1 is determined based on the straightening value. Next, the arrangement of the measurement optical system S and the state of the light flux are shown in Figure 2 (a
), (-b) and FIG. 3L+), (b). In each figure, the same reference numerals are given to the same components as in Figure 1, and each lens system is shown as a thin lens whose front principal point position and rear principal point position match for the sake of simplicity. has been done. Regarding J3, the position of the eye to be examined will be explained below only in the case of measuring the corrective refractive power for a spectacle lens. FIGS. 2(a) and 2(b) show the arrangement of the optical system during continuous refraction measurement, and to explain an example of the optical data, the focal length fj of the first projection lens 5 is 2501+1n+,
The focal length f2 of the second projection lens 12 is 150 mi,
The focal length 1iIIIlf3 of the third projection lens 14 is the same as that of the second projection lens 12, and is 150 nun. Also, the distance Q1 between the optotype 4 and the first projection lens 5 is; 25
0, the first projection lens 5 and the correction optical system 1. , the distance Q2 between = is 250 I:nn, the corrective optical system Kx, and
: and the second projection lens 12 (Ig is 100 +1
1111, second projection lens 12 f53 projection lens 1
The distance Q4 from /l is 301) nit. Further, the third projection lens 14 and the glasses wearing position P1 of the subject 111E1, E2. The distance from P2 is 20011 inches, the corneal position of the subject's eye M J , and the position where M2 and glasses are worn: , Px,
P,l! Which intervals Q are 12 sai 11. Under such optical data, 1. The case where 2 is the spherical power of 0 taobters will be explained below with respect to Fig. 2 Ca). The chief rays of the luminous flux from the optotype 4 are kept parallel to each other by the first projection lens 5 and sent to the correction optical system 1. 2, intersect on the optical axis at an intermediate position between the second projection lens 12 and the third projection lens 14, and then become two mutually parallel light beams by the third projection lens 14 and enter the eyes Ei and E2. reach. Further, the image of the optotype 4 is formed by the light, which is once focused on the point α on the axis, and then the third projection lens 1
4 to the subject eye E1. Images are formed on fundus positions β1 and β of E2, respectively. In this case, the spherical power of the subject is assumed to be 0 teopter. 1. In the corrective optical system. The center points 71 and γ2 of 2 are set to have a conjugate relationship with the points δ1 and δ2 of the subject's glasses wearing positions P1 and P2 with respect to the second projection lens 12 and the third projection lens 11. For this setting, the measurement optical system S is adjusted to align with the subject. This adjustment will be described later. Due to this setting adjustment, even though the corrective optical system is not placed in front of the examinee's eyes, the same situation can be obtained as if the corrective optical system were placed at the position where the examinee wears glasses. In the corrective optical system, 1. and 2 are explained using a thin lens system in which the front principal point position and the rear principal point position coincide, but in an actual thick lens system, the rear principal point position of the corrective optical system is overlapped. This is set to be conjugate with the points δ1 and δ· of the examiner's glasses-wearing position P1.P, ::. The luminous flux state is shown when the spherical power of + and K: is set to -10 teobters, and other optical front lf
f1N, the position of the subject, etc. are the same as in FIG. 2(a). Here, the corrective optical system Kz,,t<2 is configured so that the position of the rear principal point does not change even if the spherical power is changed, and the point γ
The conjugate relationships between 1 and point δ1, and between point γ2 and point δ2 are the second
The result will be similar to that shown in Figure (a). Note that the edge of optotype 4 is located at the subject's I.
II! Speculum position P], l) 2 to 300 Ill11 The image is formed at points ε1 and ε2 in front of the eye, and then projected onto the subject with a spherical power of -10 diopters to determine the fundus positions β1 and β2.
is imaged. Although continuous refraction measurement is performed in this way, as mentioned above, the principal rays of the two beams projected onto the subject's both eyes are always kept parallel, and the subject completes the refraction measurement in a state of natural vision at a distance. be able to. Next, the optical arrangement and the state of the light flux during the near refraction d1 will be explained with reference to FIGS. 3(a) and 3(b). When measuring near refraction, the optotype 4 is moved along with the light source 1 and condensing lens 2 toward the first projection lens 5 and along the optical axis by d (. The distance Q1 between the target 4 and the first projection lens 5 is 4 ], ,
6+nm movement setting is performed. Other optical arrangements, the position of the subject, etc. are the same as in the case of continuous refraction 6111. Fig. 3(a) shows the luminous flux state when the corrective optical system is set to 1, +(, 0 dayopter), and Fig. 3(b) shows the luminous flux state when -10 dayopter is set. Regarding (a), 8: a To clarify, the two principal rays of the light flux from the optotype 4 intersect at a point φ on the optical axis between the second projection lens 12 and the third projection lens 14, and then pass through the third projection lens. 14 to reach the subject at an intersection angle, that is, a convergence angle O.The image of the optotype 4 is focused on a point φ on the optical axis -. A point ω in front of is the virtual image position by the third projection lens 14, and this point ω is
I! Mirror wearing position 1'1. , 300 + nm in front of P2
・As a result, the subject is placed in the glasses wearing position Pty.
It is possible to standardize in the state of natural near vision with the same width and articulation angle O with the optotype 4 placed 300 m in front of P2. FIG. 3(b) shows 1. Adding the cases where l<2 is set to 110 diopters, the image of visual target 4 is a point 75 nyn in front of the subject's glasses-wearing positions P1 and P2.
The image is formed on 2. In this case as well, the eyes to be examined Ei, E2
The angle formed by the principal rays of the two light beams that reach , that is, the convergence angle O, is the same as in Figure 3 (a), and the subject is in a proper convergence state, that is, a state of near natural vision. Visual target 4 can be referenced. In addition, in this example, near refraction? I11 constant distance 3
I set it to 00 inn, but the visual target 4 moved! By changing the amount of lfl+, it becomes possible to measure near refraction at a desired distance, and even with ISUKU's 1llll constant distance 1711, it is possible to create an appropriate cross-over condition. In this way, when measuring near refraction, it is possible to obtain a standard by simply moving the optotype 4 along the optical axis, and this standard is based on the state of natural near vision. This can be achieved with In addition, in this embodiment, the correction optical system has 1, K
2 (corresponding to the front principal point position when assuming a thick lens system) is the position 250 in front of the projection lens 5.
It is placed in mm. Thereby, the visual angle when the optotype 4 on the rotating disk 3 is referenced is not affected by the position of the optotype. This means that the rotating disk 3
Rotation eliminates the need to select optotypes of different sizes, improving the 3+1 constant efficiency. Note that similar effects can be obtained even if the first to third projection lenses in this embodiment are constructed of concave mirrors. Next, the subject eye position setting optical system (2) for setting the subject eyes E1 and E2 at appropriate positions will be described. This eye to be examined position setting optical system 1 has an index 1 directed toward the eyes to be examined E1 and E.
A pair of target projection systems I4 for projecting images of 8a1.18b1 and the eye to be examined E1. E:: consists of one aiming thread J for aiming at the anterior segment of both eyes. First, the index projection system H will be explained using a right eye projection system as an example with reference to FIGS. 1, 4, and 5. light source 1
The light from 61 has a moving distance of 1lJl by the condensing lens 171.
[Illuminating the detection index plate 181.] This index plate 181
As shown in Figure 5, there is an indicator 1 on the front and back sides respectively.
8a>, 18b1 are provided. The images of these indices 18ax and 18bz are formed at the front 1u4 of the eye Ej through the fourth projection lens 19] and the reflecting mirror 201 (7). It is used to set the working distance *lE (291JfL between the measurement optical system S and the eye E1", IE 2) when measuring the corrective refraction power of the lens, and the index 18b1 is the working distance for contact lenses. In addition, the filter 211 provided in front of the light source 161 transmits only light in the near-infrared band, which is invisible light. Also, the light beam from this index projection system illuminates the area around the anterior segment of the subject's eye.The left eye projection system has a similar structure.
, the optical axis of the pair of target projection systems 1-1 is the measurement optical system S.
and inclined with respect to the optical axis of the aiming system J. Also, the point where the optical axis of the measurement optical system S intersects with the virtual line V'a passing through the center of the 71st projection lens 191 and perpendicular to its tip axis, and the center of the two indicators 18a1.18bz of the indicator plate 18 are The point where the virtual line vb intersects with the optical axis of the measurement optical system S can be obtained, and a clear NJI measurement of the image of the index 18a1 or 18tz at M, + or Ql, which will be described later, can be performed. This matching point is point F1 shown in FIG. The principle of setting the working distance using the index projection system 14 is explained below in the fourth section.
This will be explained according to the diagram. Note that unless otherwise specified, only the right eye projection system will be described. Point Q1 is a position that is conjugate with the rear principal point position of corrective optical system 1 in measurement optical system S, and when measuring the corrective refractive power of a subject for a normal eyeglass lens, the position of this point Q is 11 and the glasses-wearing position P], it is necessary to set the working distance so that they match. Therefore,
When the examinee's eye Ex or -L is positioned, the examinee I
An image of the index 18a1 is formed at the corneal apex M1 of the I-band E1. Once this is done, the examiner aims at the anterior segment of the subject's eye using the sighting system J and sets the working distance so that it coincides with the center of the pupil of the index 18a. Next, a case will be described in which the corrected refractive power of the eye E1 for contact lens 1 is measured. In this case, the eye to be examined E1 is placed at the position of the point Qj, which is the imaging position IM of the corrective optical system 1.
Is it necessary to match the anterior segment of the eye? Therefore, the index 181)1 is placed at the position of the point Q1 on the subject's eye Ex.
T! When the knee is adjusted, the mark 18bx (elephant) is formed at the center of the anterior segment of the examinee's eye. Therefore, when measuring the corrective refraction power for contact lenses, the examiner should Aim at the anterior segment of the subject's eye, and mark 18
The operation distance y+j is set so that the image b1 coincides with the pupil center. Note that the indicators 18a'', , 1.8bx are the projection lens 1.
It is arranged on the index plate 181 so that the focus position is slightly abducted with respect to 91 at 4° C., so that when set to a predetermined operation Wlj part, it can be imaged back to the niJ IIR part of the eye E1 to be examined b) . Next, the aiming system J will be explained. The eye E1 to be examined is illuminated with near-infrared light by the index projection system H as shown in FIG.
, the luminous flux from both anterior ocular segments of E2 is half mirror 15, third
The half mirror 13 is passed through the projection lens 14, and the aiming plate 23a is set by the imaging lens 22. 23b, and near-infrared light is used to form both anterior eye images of the eyes Ex and Ez on the aiming plates 23a, 2:lb, and J2. The third projection lens 1/l and the imaging lens 22 are telecentric)
- Since it has a rigid optical system, the aiming plate 23a,
23b,,I: Both anterior segment images of the examined eyes E1 and E2 are 1
Made 1! Even if the distance between the images changes, the positional deviation can be observed. The sighting plates 23a and 23b are respectively aimed at as shown in FIGS. 6 and 7. (11 fingers ml
a, nb, and nC, which are arranged so that the respective index forming surfaces face each other with a small interval therebetween, and are arranged in the corrective optical system in the K111 constant optical system S. To: The distance between the optical axes of , that is, the distance between the centers of the pair of measurement light beams projected onto the subject's eye is changed. 1fJl 'F
It has become a noh performance. In this way, the J eye area image formed by the near infrared rays of the examinee's eyes E1, E, : +6 is the index +1.1.
．． nb, IIC (7R), these images are sent to the image pickup tube 2 via a mirror 24 and a relay lens 25.
6, it is converted into a video image, and B-kyo is displayed on the monitor television 27 as a iiJ visual image. The procedure for setting the position of the finger (m projection system 11 and aiming system J to be examined TF, -+, , lE:!) will be explained with reference to FIG. 8. FIG. This is a schematic representation of the image displayed in the image 13F]1, Ba, and z are the images of the pupil of the subject's eye E', E2, and the images 13F]1, Ba, and z are the index projection system 1.
4, the eye to be examined 1': 1. Finger projected on E2 (vote 18
a1.18a2 is marked, B b, B b, z
is an image of finger+m18b1.181-JJ. Also,
Images i and 4 are images of indexes na and nb formed on the aiming plate 23a, and i is an image of index nC formed on the aiming plate 231). 8th) In case of (a), the corrective optical system has 1. The distance between the optical axes of 2, i.e., all of the distances projected onto the subject's eye
In addition to the fact that the beam center spacing for the ll light does not match the interpupillary pressure j of the subject, and the central optical axis of the measurement optical system S does not match the center of the subject's both eyes, H1l This indicates that the distance between the constant optical system S and the subject's eye Ez, E, ], that is, the working distance, is not appropriate. Below, we mainly focus on measuring the corrective refractive power for eyeglass lenses.

[The following describes the adjustment procedure for transitioning from the improper setting state to the proper setting state. Masu, eye to be examined E1. Pupil image of E2 On the 1st day, the refractometer body or the subject itself is moved and adjusted in the vertical direction so that AS is sandwiched in the center of the index image hole. At this time, the subject is fixed to a subject holding section (not shown), and the position of the subject can be adjusted by moving the subject holding section. This adjustment completes the optical axis alignment in the vertical direction (see FIG. 8(b)). Next, as shown in FIG. 8(C,), index images Ba], B
a. Move the apparatus main body or the subject itself along the measurement optical axis so that it is located at the center of the 2-cus index image na, that is, at the center of the pupil image Ai, A, :. This movement adjustment completes the setting of the working distance. In addition, when measuring the corrective refractive power for contact 1-lens, the index image B
bx, Bb2 should be adjusted so that the index mark (n) is located at the center of a, that is, the pupil images Az, A are located at the center.7. The following adjustments are the same in the case of corrective refractive power measurement for contact lenses. Next, as shown in FIG. 8(d), the apparatus body or the subject is moved in the left-right direction so that the distance between the pupil @Aj and the index image nb and the distance Im between the pupil image A2 and the index image i are made equal. move it to This adjustment completes the alignment of the central optical axis of the measurement optical system S and the eye to be examined E], E in the left-right direction. Next, as shown in Fig. 8 (, ()), by moving the sight plate 23a, 2:3b, the index hole and door are moved in the left and right direction, and the center of the pupil image Δx, A, is adjusted. The index image hole and the shoulder are aligned with each other, and the sight plates 23a, 23
As described above, the sights Fj, 23a, and 23b move by the same amount in opposite directions, and the movement of the sights Fj, 23a, and 23b causes the correction optical system to have 1. 7 in conjunction with the optical axis movement in step 2. In this way, the distance between the optical axes of 1 and K2 in the correction optical system is the eye to be examined E1,
The optical axis of the measurement optical system S can be made to match the pupil distance of the eye E1.F:]. Optical axis alignment and working distance adjustment of E;・ are completed. Next, 1. , , 9th drive mechanism for 2
This will be explained based on the diagram. The corrective optical systems K] and K2 are attached to optical benches 301 and 302 and are movable within a plane including both optical axes so that both optical axes can be moved closer or farther apart. That is, the optical benches 30 It is connected to a moving motor 36 via. Here, the pheasant thread part 34 of the connecting member 33 is divided into two parts each having opposite threads, each of which is adapted to be screwed into the female thread part of the flaket 32 of the optical table 3Ch, 302. Note that the screwing state of the optical bench 302 with the brackets 1 to 3 and the connecting member 33 is not shown. Next, 1. 2 will be explained, but since both optical systems have the same +, 2, and = configurations, one optical system K1 will be explained as an example. The first group lens system 61 is arranged at the front end of the lens barrel 37], and
1 is provided with a lug 381 extending in the optical axis direction. And this rack 381 is vinyl on 39.
This pinion 391 is pivotally supported by the motor 40. This allows the first group lens system 6 to move along the optical axis. Further, a second group lens system 7 is provided behind the first group lens system 61.
” and one of the third group lens systems 81 at a predetermined interval lJ.
Each lens system 71. ．． 81) ■School building 3
Furthermore, a lens barrel 41 is installed behind the lens barrel 371, and two cylindrical lenses 9x and 91 are arranged in front and behind each other in this lens barrel 411. The cylindrical lens 91 on the - side is engaged with a link gear 421, and this link gear 421 is connected to the motor 44 via a drive gear 431. This link gear 451 is attached to a ring gear 451 provided at the rear of the
is connected to a motor 471 via a drive gear 461. In this way, the cylindrical lens 9.1.91 is rotatable around the optical axis. . Further, a lens barrel 481 is provided behind the lens barrel 411, the other of the third lens groups 8 and 1 is fixed to the front end of this lens barrel 481, and a horizontal deflection prism 101 is fixed to the front end of the lens barrel 481.
, 101 are arranged. The crown gears 491501 of these declination angle bridges A10+ and 101 are taken out respectively, and these crown gears 491 and 5
01 is combined with one binion 511, and this binion 5
11 is driven one rotation by a motor 521. As a result, the deflection prisms 101 and 101 can be rotated by the same angle in opposite directions. Furthermore, vertical deflection prisms 111 and +11 are arranged behind the horizontal deflection prisms 101 and 103, and these deflection prisms ILx and 1.1x are provided with crown gears 531. These crown gears 53+, 54:+ can be rotated in the same way as in the horizontal direction by a motor 561 via a pinion 55t. 30;: is an optical bench 30x, 3 where support tubes 57 and 58 for front and rear guides are taken.
The horizontal movement of 02 is made stable. Also,
Optical bench 301, 30. :! At the rear end of the guide slot I"5
! h, 592 and arm 601. , 602, the slider plates 621 and 622 are connected, and the arm 6 (
h, 602 is rotatable around the rotating bins 61J, 612, and the slide plate 621.6L?
The horizontal movement of the optical axes of the corrective optical systems Kr, r, ie, the movement of the 1lllll normal beam travel distance projected onto the eye to be examined, can be visually observed by the movement of . The correction optical systems Kx and Kz configured in this way are connected to each motor 3.
6.4ON, 402, . . . are outputted to the output of a control arithmetic circuit, which will be described later, and are controlled to perform adjustment driving. Note that the eclipse motor 441 is attached to the optical bench 3002.
, 47. Illustrations of motors that move in the same way as L are omitted, and illustrations and descriptions of members and parts that appear symmetrically in the other optical systems K 1 , K, . . . are omitted. Next, a processing system such as a control arithmetic circuit for controlling and driving the present device will be explained based on FIG. In the figure, reference numeral 70 indicates a control calculation circuit, and this control calculation circuit 70 receives a signal from the drive input section Xa or the f-tar input section Xb and performs control calculations to operate the drive output section Y and the display means Z. What it does is composed of a microcomputer, etc. The data input section xb is for inputting refractive power data of the subject's eye that is roughly known in advance, such as measurement result data with an objective refractive power measuring device, etc.
By providing this data input section xb, highly accurate measurements can be made in a short time using the subjective refractometer of the present invention from the corrected power set based on measurement result data input in advance. The distance/near change switch 71 of the drive input section Xa is connected to a motor 73 for moving the refractive power test optotype 4 via a drive circuit 72.
A single motion signal is supplied to the control f calculating circuit 70 to provide selection information for far-sight Ell measurement or near-sight refraction measurement. In addition, the corrective optical system inter-axis movement switch 74 of the IW dynamic input section Xa supplies 1121tlJ information to the moving motor 36 for changing the distance between the respective optical axes of the corrective optical system Kt, and performs control calculation. A command from the circuit 70 is received and the output thereof is used to drive the moving motor 36 via a drive circuit 75 constituting the drive output section Y. Further, by operation 11b of the correction optical system inter-axis movement switch 74, the movement motor 36 is driven 1, and the aiming plates 23a, 2 are driven.
When 3t+ moves and the interpupillary distance is determined, the value is displayed on the interpupillary distance display section 76L that constitutes the display element 1 and 2. Note that the interpupillary pressure (η (E) is also controlled by commands from the data input section 77. Frequency change switch 781
, 782 is the motor 4 for moving the first group lens system 63.62.
0+, 40. It adds one drive information to +,
Control calculation circuit "toj'; Yobi l!N !lil* Output fit', Y ]19K m!IJ times'181g1
．． 79 through motor 401.411.7. It is so that the 1 drive signal is increased by 1. When the C1 spherical power changes in this manner, a corresponding value is displayed on the spherical power display section 80 of the display means Z. The spherical power is also controlled by a signal from the spherical power data section 81 of the data input section xb.7 Furthermore, the cylindrical power change switch 821, 82 of the drive input section xb:! are the first and second
Cylindrical lens 91.9], 9t, 9. : provides drive information to the motors 7I711.47t which aim to rotate in opposite directions to the motors 441, 47jl via the control calculation circuit 70 and the drive 9 circuits 83, 832, 831.832 of the drive output section Y. \It is designed to give a drive signal. In this way, as the cylinder power changes, the value is displayed on the cylinder power display section 84 of the display means Z. Further, the cylinder power is also controlled by a signal from the cylinder power theta section 85 of the data input section xb. Further, the cylindrical shaft angle change switch 851. of the drive input section Xa.
85-! are the first and second cylindrical lenses 9, 9s, 9
a motor 44+ for making 1.92 turns in the same direction;
, to 47+! W, IIJ information is provided to the control arithmetic circuit 7,] and the drive circuit 83 of the drive output section Y.
1.83:! , 8. -1], 83:> to give a driving force to the motor 1, 471. In this way, when the 0th degree of the cylinder axis is determined, the value is displayed on the cylinder axis angle display section 86 of the display means Z. Also, the angle of the cylinder axis is determined by the cylinder axis angle theta section 8 of the data input section xb.
It is also controlled by the signal No. 7. The horizontal deflection prism change switch 88x, 88:2 of the drive input section Xa is a motor for rotating the horizontal deflection prism 1υ+, ](h, 10.:, 102!'i:!1. , 52z, and the motor 52], via the control calculation circuit 7'' and the drive circuit 891.8!
, 522 to provide a drive signal. In addition, the vertical force plane declination prism change switch 901.9021 of the drive input section Xa or the vertical declination prism I]
Motor 5 for rotating Ill, 11=, 112
lfA on 61.562! It provides I'JJ information, and is used by the control calculation circuit and the drive circuit 91 of the drive output section Y.
1. A drive signal is now applied to the motors 5611 and 562 via the old motor. Thus, from the bias, tII
The skew correction prism value displayed on the skew correction prism value display section 92 of the display means Z is displayed. Further, the prism value is also controlled by a signal from the skew correction prism value data section 93 of the data input section Xb. The signals corresponding to the values displayed on the name display sections 76, 110, etc. of the display means Z are the images obtained from the image pickup tube 26 (the synthesis circuit 95, which together with number n constitutes the signal processing section 94)
Signal synthesis is performed, and the result of the refractive power measurement to be corrected is displayed on the screen of the monitor television 27 in response to the output of the synthesis circuit 95. Next, a control example of the control calculation circuit 70 will be explained. For example, in order to obtain the desired spherical power and cylindrical power by operating the spherical power change switch 781 and the cylindrical power change switch F821, the six corrective optical systems 1 (1st) 11, 2nd group, and 311i4 lens system are required. , 7], 83 (
(hereinafter referred to as a spherical optical system) and the first and second cylindrical lenses, 91.9] (hereinafter referred to as a cylindrical optical system) may be adjusted as follows. In other words, the combined refractive power of the spherical optical system and the cylindrical optical system is determined by the first and second cylindrical lenses 9
Since it is expressed as a function of the intersection angle of each axis of x and 9*,
Perform 11 adjustment such as setting the intersection angle to correspond to spherical power or cylindrical power 13. In addition, when obtaining the angle of the cylinder 1ili by the cylinder axis change switch 851, the first and second cylinder lenses 9r, 9
The second cylindrical lens 91 or the second cylindrical lens 91 is rotated by an angle determined by the sum or difference of the intersection angle of each axis of x and the base angle. Furthermore, a horizontal deflection prism change switch 883
, 88: In order to obtain the desired Brism value, since a predetermined relational expression is established between the rotation angle of the declination angle Bris l, ]0+, 10i and the Brism value, the angle corresponding to the Gris 11 value is established. Rotate the angle prisms l, 101 and J, 01. To obtain a vertical prism, use a horizontal prism ], Oj, ] (orthogonal to h, ゛C
In addition to taking into account the fact that the prisms 111 and 101 are arranged vertically in the same way as in the horizontal direction, the rotation of the vertical deflection prisms 111 and 101 is controlled. In this embodiment, the case where the present invention is applied to the IT-type refractometer 6 has been described, but the same applies to a third-view refractometer. As explained above, according to the present invention, the index projection which forms a projected image of the distance detection index created on the anterior segment of the subject's eye; Anterior segment of optometry 1! (
(The optical axis of the aiming optical system to be illuminated is provided so as to be inclined to the optical axis of the aiming optical system, and at least two indexes are placed on the optical axis at a distance of 1llllC from the optical axis of the index projection system.
? , so for example, two indicators are placed on the front and back of a flat transparent finger @ W temporary.
The refractive power can be determined by arbitrarily setting the two working distances to 11 J using a flexible means, and can meet the desired requirements.

[Brief explanation of drawings]

1 V'ir to 10 are diagrams explaining the present invention in detail, and FIG. 1 is a perspective view showing the arrangement of the optical system of the subjective refractive power 11111 fixing device, FIG. 2(n), (b)
2 is a schematic diagram showing the luminous flux state of the measurement optical system in distance refraction measurement, and FIG. 2(a) shows the case of an O-teopter, and FIG. 2(b) shows the case of a -10-teopter. Figures 3(a) and 3(b) are schematic diagrams showing the luminous flux state of the measurement optical system for near refraction measurements. (1)) is -
Figure 4 showing the cases of 10 te and r of ter, respectively.
The figure is a schematic configuration diagram showing the layout of the index projection system. FIG. 5 is a schematic diagram showing the index of the index projection system, and FIGS. 6 and 7 are schematic diagrams showing the index of the aiming optical system. 8A and 8B respectively show the index images of other index plates, and FIGS. 8(,1) to (e) are diagrams explaining the procedure for adjusting the position of the eye to be examined, and FIG. Figure 8(b) shows the -1: direction adjustment, Figure 8(c) shows the operating pressure 7111 setting has been completed, and Figure 8(d) shows the left/right adjustment. 1μs! FIG. 8(e) shows the case where all adjustments have been completed, FIG. 9 is a perspective view showing the lens drive mechanism of the corrective optical system, and FIG. 10 shows the lens 11. ! FIG. 2 is a block diagram illustrating a circuit that controls til++ drawing. IL,' 18 ・Operating hole 1! JI+ detection index plate. 18a+, ]8a; 2... Eyeglass lens index 2]
81) + -1, Flb 2...Contact 1-lens index, S.../1lll constant optical system, J...Sighting system, F(...index projection system. El, E2-Eye to be examined.

Claims (3)

[Claims] (1) A measurement optical system for measuring the refractive power of the eye to be examined. and an aiming system for aiming at the anterior segment of the subject's eye. an index projection system having an optical axis inclined with respect to the optical axis of the aiming system and forming an index image on the anterior segment of the eye to be examined for each of the at least two indexes; By arranging the centers of each index at different positions spaced apart from the optical axis of the index projection system and at different positions along the optical axis of the index projection system, the center of each index is located at a different position along the optical axis of the index projection system. 1. A refractive power measuring device, characterized in that at least two types of working distances of 1 L can be set between the constant optical system. (2) A patent claim characterized in that the two types of operation j'ti Mlt are working distances for measuring the corrective refractive power for glasses/lenses of the eye to be examined and for measuring the corrective refractive power for lenses for contact lens 1. The refractometer according to item 1. (3) On the optical axis of the measurement optical system, there is an imaginary line that passes through the center of the projection lens system that constitutes the index projection system and is orthogonal to the optical axis of the projection lens system, and an imaginary line that connects the index centers of the two indexes. 3. The refractometer according to claim 1, wherein the refractometer has a common intersection point.