CN104739365B - A variable-distance phoria measurement device - Google Patents

Abstract

The invention discloses a kind of variable-distance heterophoria measuring device, comprise point source, graduated disc, graduated disc light source, two lens turrets, multiple lens, look sheet rotating disk, geneva bar sheet, zero diopter sheet and Hardware drive module; Described two lens turrets arrange multiple lens one to one respectively, and described multiple lens is arranged along the circumference of described lens turrets, rotate the different battery of lens of described lens turrets scalable to measuring position for the formation of the point source virtual image of different distance.Measuring device of the present invention can produce the point source virtual image of different distance by rotating lens turrets, thus can realize the measurement of accurate displacement, and pitch range, from 33CM to infinity, is the instrument that doctor provides accurate displacement to measure.

Description

A variable-distance phoria measurement device

technical field

The invention relates to a variable-distance heterophoria measuring device, which belongs to the field of ophthalmic medical treatment.

Background technique

Phphoria is a potential deviation of eye position to a lesser extent than strabismus, and its patients can maintain binocular single vision under the control of fusion reflex, so as to force the two eyeballs to remain in the normal position without showing deviation. Misalignment manifests itself when brain fusion is blocked (eg, when one eye is covered) or out of control (eg, during vision overuse or mental fatigue).

Clinically, a common method for accurate and quantitative detection of phoria is by using the von Graefe technique with a phoropter. However, the technique has communication difficulties in some young children and has limitations in non-office settings, such as mass vision screening/screening, and some research settings. At present, the existing phoria measurement devices on the market are fixed-distance measurement devices with only one distance, and the measurement range is small, and the accuracy is not enough, which has great limitations in clinical, screening and scientific research and other related applications. Therefore, those skilled in the art are devoting themselves to developing a measuring device that can accurately change the distance, and preferably is portable, so that medical personnel can provide detection for patients more conveniently and accurately.

Contents of the invention

In order to solve the problem that the existing phoria measuring device cannot change the distance and has poor measurement accuracy, the present invention provides a variable-distance phoria measuring device, which switches lenses of different thicknesses by rotating the lens turntable to obtain different The angle α between the light path of the line of sight. The smaller the angle α is, the farther the simulation distance is, and when the angle α=0, the simulation is infinite. It has the characteristics of precise variable distance measurement.

The technical solution provided by the present invention is: a variable-distance phoria measurement device, including a point light source, a dial, a dial light source, two lens turntables, multiple sets of lenses, a optic turntable, a Maldox rod sheet, a plano-optic sheet and Hardware drive module; the point light source can move relative to the scale along the scale direction on the dial. groups of lenses, and the plurality of groups of lenses are arranged along the circumference of the lens turntable, and rotating the lens turntable can adjust different lens groups to measurement positions for forming virtual images of point light sources at different distances; the Maddox rod sheet and The flat light film is set on the turntable, used to provide visual windows for the eyes of the person being measured; the dial light source is set near the dial or just on the dial, the scale The disk light source is used to provide illumination when reading the scale; the hardware drive module controls the rotation of the lens turntable and the film turntable, and the lighting or extinguishing of the point light source and the dial light source.

Preferably, the dial is made of light-guiding material; further, the light source of the dial is located above the dial, and when the light source of the dial is turned on, the entire dial made of light-guiding material is lit; further preferably Specifically, the dial is black on a white background.

Preferably, the point light source is a red light source located behind the dial.

Preferably, the scale is rotatable so that the scale on it can be placed horizontally or vertically.

Preferably, the variable distance range of the variable distance phoria measurement device is from 33CM to infinity.

Preferably, the multiple groups of lenses are provided with three groups of lenses on each lens turret, and they can be evenly arranged around the periphery of the lens turret with the center of the lens turret as the center.

Preferably, the Maldovsky rod sheets and the plain optical sheets are symmetrically distributed on both sides of the viewing turntable, and the distance between the Maddox rod sheets and the plain optical sheets can be adjusted according to the interpupillary distance of the person being measured, and The Maldox rod can be rotated to a horizontal position or a vertical position.

Preferably, the variable distance phoria measurement device is a portable device.

The present invention has the following beneficial effects: due to the adoption of the above scheme, the measuring device can switch lenses of different thicknesses by rotating the lens turntable, and can generate virtual images of point light sources at different distances, thereby realizing accurate variable distance measurement, and the variable distance range is from 33CM to infinity It provides doctors with a tool for accurate variable distance measurement.

Description of drawings

Fig. 1 is a schematic structural view of a preferred embodiment of the present invention.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings.

Fig. 1 shows the structural representation of a preferred embodiment of the present invention, and a kind of variable-distance phoria measurement device comprises point light source 1, scale plate 2, scale plate light source 3, two lens turntables 4, six groups of lenses 5, sight A turntable 6, a Maddox rod sheet 7, a flat sheet 8 and a hardware drive module 9; the point light source 1 is located behind the dial 2, and can move relative to the scale along the scale direction on the dial 2; the dial 2 is made of light-guiding material, when the point light source 1 is on, a red light source bright spot is displayed on the dial; the dial light source 3 is set above the dial, when the dial light source 3 is on, The entire dial 2 made of light-guiding material clearly presents the scale of black characters on a white background; the two lens turntables 4 are respectively provided with three groups of lenses 5 corresponding to each other, and the three groups of lenses 5 are arranged along the The circumferential arrangement of the lens turntable 4, rotating the lens turntable 4 can adjust different lens groups to the measurement position for forming virtual images of point light sources 1 at different distances; the Maddox rod sheet 7 and the flat sheet 8 are It is arranged on the video turntable 6 to provide visual windows for the eyes of the subject to be measured; connected to control the rotation of the lens turntable 4 and the film turntable 6 and the lighting or extinguishing of the point light source 1 and the dial light source 3 .

When measuring, light up the red point light source 1 first, and the left and right eyes of the person to be measured pass through the Maddox rod sheet 7 and the flat light sheet 8 on the viewing sheet turntable 6, and then see the red light and the red light spot through the lens group 5, When the red light does not intersect the red light spot, adjust the position of the point light source until the red light intersects the red light spot, then turn off the point light source 1, turn on the dial light source 3, and read out The position of the point light source 1 on the dial, and its corresponding value is the phoria value. The phoria value of different viewing distances can be obtained by changing different lens groups. An included angle α is formed between the optical path of the point light source-lens group-Madov rod sheet formed by the virtual point light source and the optical path of the point light source-lens group-planar sheet. The smaller the included angle α, the farther the simulation distance is. When the angle α=0, it simulates infinity. Therefore, the doctor can measure the patient's phoria very intuitively and accurately.

Claims (10)

1. A variable-distance heterophoria measuring device, comprising a point light source, a scale, a turntable for viewing, a Maddox rod sheet and a plain sheet; the Maddox rod sheet and the flat sheet are arranged on the turntable for viewing It is used to provide visual windows for the eyes of the person being measured, and it is characterized in that the variable-distance phoria measurement device also includes a dial light source, two lens turntables, multiple groups of lenses, and a hardware drive module; The point light source can move relative to the scale along the scale direction on the dial. When the point light source is on, a bright spot of the light source is displayed on the dial; multiple sets of lenses corresponding to each other are respectively arranged on the two lens turntables, and the Multiple groups of lenses are arranged along the circumference of the lens turntable, and rotating the lens turntable can adjust different lens groups to measurement positions for forming virtual images of point light sources at different distances; the dial light source is set at a position close to the dial Or just on the dial, the dial light source is used to provide illumination when reading the scale; the hardware drive module controls the rotation of the lens turntable and the film turntable and the lighting of the point light source and the dial light source or off. 2. The variable-distance phoria measurement device according to claim 1, wherein the dial is made of light-guiding material. 3. The variable-distance phoria measuring device as claimed in claim 2, wherein the dial light source is positioned above the dial, and when the dial light source is turned on, the entire dial made of light-guiding material is clicked. Bright. 4. The variable-distance phoria measurement device according to claim 2, wherein the dial is black on a white background. 5. The variable-distance phoria measurement device according to claim 1, wherein the point light source is a red light source and is located behind the dial. 6. The variable-distance phoria measurement device according to claim 1, wherein the dial is rotatable so that the scale on it can be placed horizontally or vertically. 7. The variable-distance phoria measurement device according to claim 1, characterized in that, the variable-distance range of the variable-distance phoria measurement device is from 33CM to infinity. 8. The variable-distance heterophoria measuring device as claimed in claim 1, wherein the multiple groups of lenses are provided with three groups of lenses on each lens turntable, and they can be arranged uniformly on the center of the lens turntable around the lens turret. 9. variable-distance phoria measuring device as claimed in claim 1, is characterized in that, described Maldoch rod sheet and flat smooth sheet are symmetrically distributed on the both sides of described visual sheet turntable, and described Maldoch rod sheet and described The distance between the plain light sheets can be adjusted according to the interpupillary distance of the person being measured, and the Maddox rod sheet can be rotated to a horizontal position or a vertical position. 10. The variable-distance phoria measurement device according to any one of claims 1-9, wherein the variable-distance phoria measurement device is a portable device.