CN117348275A - The optical center of the orthokeratology lens and the design structure of the multi-arc lens - Google Patents

Abstract

The invention discloses a design structure of an optical center and a multi-arc segment lens of a cornea molding sheet, wherein the lens is a cornea molding sheet worn on the cornea surface of a preset eyeball, the surface of the lens is aspheric, the lens comprises a base arc and a reversal arc of a treatment area, which can be used for light to pass through to image at the retina of the eyeball, and a positioning area of a non-visual area outside the treatment area, which comprises a parallel arc and a side arc, the lens is provided with the reversal arc, the parallel arc and the side arc from the outer side of the base arc to the outer side in sequence, the inner side of the base arc is provided with an optical center inner arc and a tear height inner arc with different radians in two sections respectively, so that the eyeball can pass through the two-section radians of the base arc to increase the peripheral defocus area imaged on the retina and maintain the visual degree of the existing vision, and further effectively control myopia or hyperopia, thereby achieving the purposes of controlling vision, correcting myopia or hyperopia, and the like.

Description

The optical center of the orthokeratology lens and the design structure of the multi-arc lens

Technical field

The invention relates to the design structure of an optical center of an orthokeratology tablet and a multi-arc segment lens. In particular, the inner side of the base arc of the lens is in two sections, respectively provided with an optical center inner arc and a tear height inner arc of different curvatures to maintain The optimal tear storage capacity between the lens and the eyeball can maintain the image viewing clarity of existing vision, increase the peripheral defocus area of the image on the retina, and effectively control myopia or hyperopia.

Background technique

At present, the main ways to correct refractive error include wearing glasses, contact lenses, corneal myopia surgery or orthokeratology lenses. Each of the above methods has its own advantages and disadvantages. Here, in particular, Research on orthokeratology lenses. The orthokeratology lenses are made of highly oxygen-permeable hard materials. When the lenses are worn on the eyeballs, there is a layer sandwiched between the lenses and the outer surface of the cornea of the eyeballs. Unevenly distributed tears can flatten the epithelial cells through the positive pressure exerted by the tears on the cornea. At the same time, if the wearer uses the eyelids to close the eyes, the weight of the eyelids and lenses will exert pressure on the cornea. Applying a certain amount of pressure and wearing it for enough time can gradually flatten the central curvature of the cornea and gradually thin the central epithelial layer, thereby flattening the central cornea and thereby reducing the refractive power of the cornea, thereby correcting myopia and even restoring myopia. Effects of normal vision.

However, although orthokeratology lenses can generally correct myopia, some people cannot effectively control the progression of myopia by wearing orthokeratology lenses. As a result, myopia will continue to grow, and orthokeratology lenses will continue to grow at low powers ( (about 50 to 400 degrees), because the base curve of the orthokeratology lens is spherical, the space formed by the spherical base curve and the inversion curve on one side for tear accumulation will be insufficient, resulting in The inability to effectively squeeze epithelial cells results in poor myopia control. How to solve the current problems and problems of wearing orthokeratology lenses is the direction that relevant manufacturers in this industry are eager to research and improve.

Contents of the invention

Therefore, in view of the above-mentioned problems and deficiencies, the purpose of the present invention is to provide a corneal remodeling sheet through the collection of relevant information, through multiple evaluations and considerations, and through continuous creation and modification based on years of experience accumulated in this industry. Optical center and multi-arc lens design structure.

In order to achieve the above object, the present invention provides an optical center of an orthokeratology piece and a design structure of a multi-arc lens. The aspherical lens is an orthokeratology piece worn on the corneal surface of the preset eyeball. The surface is Aspheric shape, including the base arc and reversal arc of the treatment area, which allow light to pass through to be imaged on the retina of the eyeball, and the positioning area of the non-visual area outside the treatment area, including parallel arcs and edge arcs, and the lens is composed of the base arc There are reverse arcs, parallel arcs and edge arcs on the outside in order. There is an optical center inner arc at the center point of the base arc. There are tear height inner arcs of different arcs located outside the optical center inner arc, which can provide eyeballs. The two-stage curvature of the base curve can increase the peripheral defocus area of the image on the retina, maintain the image viewing clarity of existing vision, and maintain a better tear storage capacity between the lens and the eyeball, and can pass through The electronic device simulates wearing a lens on the cornea, and uses a calculation formula to calculate the amount of tear fluid between the cornea and the base arc and the inversion arc of the lens. The calculation equation is tear amount = Then effectively control myopia or hyperopia, thereby achieving the purpose of correcting and controlling myopia or hyperopia.

In one embodiment of the present invention, the eccentricity of the base arc of the lens can be between -4 and 4, and the eccentricity of the image screen imaged on the retina of the preset eyeball is non-zero, and the inversion arc of the lens It is aspherical, and the third intersection point between the parallel arc and the edge arc of the lens is in contact with the corneal surface of the preset eyeball.

In one embodiment of the present invention, the lens can simulate wearing the above-mentioned lens on the cornea through an electronic device, and uses arithmetic formulas to calculate the amount of tear fluid between the cornea and the base arc and reversal arc of the lens, and then adjusts the The eccentricity of the base curve of the shaping lens makes the base curve aspherical, thereby making the amount of tear fluid between the shaping lens and the cornea conform to the shape of the cornea and the amount of tear fluid required to produce peripheral defocus. This manufacturing method can easily Making sure that the amount of tear fluid between the lens and the cornea meets the required tear volume can reduce manufacturing errors and thereby improve product yield.

Description of drawings

Figure 1 is a schematic diagram of the light path of the present invention.

Figure 2 is a side cross-sectional view of the present invention.

Figure 3 is a schematic diagram (1) of the base arc radius design of the present invention.

Figure 4 is a schematic diagram (2) of the base arc radius design of the present invention.

Figure 5 is a schematic diagram of the base arc proportional design of the present invention.

Figure 6 is a flow chart of the present invention.

Explanation of reference signs: 1-lens; 100-center point; 101-first intersection point; 102-second intersection point; 103-third intersection point; 11-treatment area; 111-base arc; 112-reversal arc; 113- Optical center inner arc; 114-tear height inner arc; 12-positioning area; 121-parallel arc; 122-edge arc; 2-eyeball; 20-image screen; 21-retina; 211-peripheral out-of-focus image area; 22- Cornea; A0-spherical image screen.

Detailed ways

In order to achieve the above objects and effects, the technical means, structures, implementation methods, etc. used in the present invention are described in detail below for a complete understanding of the preferred embodiments of the present invention.

Please refer to Figures 1, 2, 3, 4, and 5, which are respectively a schematic diagram of the light path, a side cross-sectional view, a schematic diagram of the base arc radius design (1), and a schematic diagram of the base arc radius design (1) of the present invention. 2) Schematic diagram of base-curve ratio design. It can be clearly seen from the figure that the optical center of the corneal plastic sheet of the present invention and the design structure of the multi-arc segment lens. The lens 1 is a corneal plastic sheet, and the surface is It is aspherical and includes a treatment area 11 for light to pass through to be imaged at the retina 21 of the eyeball 2, and a positioning area 12 in the non-visual area outside the treatment area 11, where:

The treatment area 11 includes a base arc 111 (BC) with an eccentricity (E value) between -4 and 4, and a matching base arc 111 is formed outside the base arc 111 to form a gap with the eyeball 2. Reversal arc 112(RC) for tear accumulation.

The positioning area 12 includes a parallel arc 121 (Alignment Curve) that enables the lens 1 to be firmly positioned on the eyeball 2, and a side curve 122 (PC) located outside the parallel arc 121.

And the eccentricity of the base arc 111 of the treatment area 11 of the lens 1 can be between -4 and 4, and when the eccentricity is between 0 and 1, the surface of the base arc 111 is in an elliptical shape; and, the base arc 111 has an elliptical shape. 111 may further include two sections of optical center inner arc 113 (BC1) and tear height inner arc 114 (BC2) with different radian proportions, wherein the optical center inner arc 113 (BC1) and the tear height inner arc 114 (BC2) are The aspheric surface value [Ai] is:

And the eccentricity value (e) is:

Then (e) above is the eccentricity value, (c) is the curvature value [curvature], (r) is the radius of curvature of the lens 1, and (A _i ) is the tear height inner arc 114 (BC2) The aspheric surface value, [P _i (x, y)] is a function of the coordinate value of the radius of lens 1 on the coordinate axis.

The above-mentioned lens 1 is provided with a reversal arc 112, a parallel arc 121 and a side arc 122 of the positioning area 12 in sequence from the outside of the base arc 111 of the treatment area 11, and a center point 100 is formed in the center of the base arc 111. , and a first intersection point 101 is formed at the intersection of the base arc 111 and the reversal arc 112, a second intersection point 102 is formed at the intersection of the reversal arc 112 and the parallel arc 121, and a third intersection point is formed at the intersection of the parallel arc 121 and the side arc 122. 103, and the straight-line distance between the first intersection point 101 at the intersection of the base arc 111 and the inversion arc 112 and the cornea 22 of the preset eyeball 2 is between 89 μm and 189 μm, thereby effectively controlling myopia or hyperopia, thereby achieving the desired effect. To correct myopia or hyperopia.

The preferred ratio [D 1 : D2] of the optical center inner arc 113 of the base arc 111 of the lens 1 and the width of the tear height inner arc 114 [D ₁ : D2] can be 2:1, and when the length of the tear height inner arc 114 is 6 mm When , the angle of the inner arc 113 of the optical center is 1.78°, and the angle of the inner arc 113 of the optical center + the inner arc 114 of the tear height is 2.34°.

In addition, the preferred ratio [D 1 : D 2 ] of the optical center inner arc 113 of the base arc 111 of the lens 1 and the width of the tear height inner arc 114 [D ₁ : D ₂ ] can be 2:1, then when the tear height inner arc 114 When the length is 5.5mm, the angle of the inner arc 113 of the optical center is 1.657°, and the angle of the inner arc 113 of the optical center + the inner arc 114 of the tear height is 2.238°.

And based on the radius design method of the optical center inner arc 113 of the base arc 111 of the lens 1 and the tear height inner arc 114 (please also refer to Figures 3, 4, and 5), when the base arc 111 reaches the retina of the eyeball 2 The axial length between 21 = 24.02mm, the radius of the base arc 111 can be 7.72mm, (e) is the eccentricity value [eccentricity] = 0.51°, where: (θ) is the incident angle relative to the normal; (η) is the refraction angle relative to the normal; (w) is the width of the optical center inner arc 113, or the width of the optical center inner arc 113 + tear height inner arc 114; (Ψ) is the viewing angle half width.

Then the width of the optical center inner arc 113 and the tear height inner arc 114 of the base arc 111 of the lens 1 can be designed in two sections. The better ratio is that the width occupied by the optical center inner arc 113 and the tear height inner arc 114 is larger. The optimal ratio [D ₁ : D ₂ ] is 2:1, which can increase the capacity space for storing tears between the inside of the base arc 111 and the cornea 22 of the eyeball 2, and increase the moistness of the tears to the cornea 22 of the eyeball 2 for the purpose. The optical center inner arc 113 and the tear height inner arc 114 of the base arc 111 can closely resist and adhere to the cornea 22, and allow the retina 21 of the eyeball 2 to maintain the image viewing clarity and clarity of existing vision through the lens 1. visual field, etc., and can achieve the effect of slowing down the growth rate of the eyeball 2 and further having good control of vision (myopia or hyperopia, etc.).

As for the width ratio [D 1 : D 2 ] of the optical center inner arc 113 of the base arc 111 of the lens 1 and the tear height inner arc 114 [D ₁ : D ₂ ], it can also be 2/3: 1/3 or 3/4: 1/ 4, etc., and the length from the center point 100 of the optical center inner arc 113 to the intersection point of the tear height inner arc 114 and the positioning area 12 (i.e., the first intersection 101) on one side can be 3.25 mm to 5.25 mm.

Moreover, the eccentricity of the base arc 111 of the lens 1 can be between -4 and 4, and the eccentricity of the image screen imaged on the retina 21 of the preset eyeball 2 is non-zero, and the treatment area 11 of the lens 1 The inversion arc 112 is aspherical, and the straight-line distance between the second intersection 102 of the inversion arc 112 and the parallel arc 121 of the positioning area 12 and the cornea 22 of the preset eyeball 2 can be between 15 μm and 25 μm. During this time, the third intersection point 103 between the parallel arc 121 and the edge arc 122 of the positioning area 12 of the lens 1 is in contact with the surface of the cornea 22 of the preset eyeball 2 .

Moreover, the straight-line distance between the second intersection point 102 between the reversal arc 112 of the treatment area 11 of the lens 1 and the parallel arc 121 of the positioning area 12 and the cornea 22 of the eyeball 2 is between 15 μm and 25 μm. Due to the The base arc 111 and the inversion arc 112 are aspherical, so the straight-line distance between the second intersection point 102 and the cornea 22 of the eyeball 2 can be indeed between 15 μm and 25 μm through this aspheric design, thereby improving the manufacturing time. Accuracy, and because the base arc 111 of the lens 1 is aspherical (the eccentricity is non-zero), the eccentricity of the image screen on the retina 21 of the eyeball 2 can be made non-zero, thereby increasing the number of images on the retina 21 The peripheral defocus area on the lens can effectively control the speed of eye axis change (lengthening or shortening), thereby effectively controlling myopia or hyperopia, thereby achieving the effect of correcting myopia or hyperopia.

Furthermore, the third intersection 103 between the parallel arc 121 and the edge arc 122 of the positioning area 12 of the lens 1 is in contact with the surface of the cornea 22 of the eyeball 2. Since the lens 1 is in the shape of an arc, the lens 1 crosses The circumference closer to the periphery will be larger, so that when the third intersection point 103 contacts the surface of the cornea 22 of the eyeball 2, the most contact part will make the lens 1 less likely to shake when the eyelid is closed, thereby reducing The offset of the lens 1 can thereby improve the accuracy during squeezing to truly squeeze the surface of the cornea 22 .

In addition, the preset curvature of the base curve 111 of the treatment area 11 of the lens 1 is greater than the horizontal curvature of the cornea 22 of the eyeball 2 (that is, the curvature of the base curve 111 is flatter than the horizontal curvature of the cornea 22). Since the base curve 11 The curvature is greater than the curvature of the cornea 22. When the lens 1 is worn on the eyeball 2, it can generate a positive pressure on the epithelial cells of the cornea 22 through the tears between the base arc 11 and the cornea 22; in addition, the lens 1 The reversal arc 112 is used to store tears, so that the negative pressure provided by the tears can be used to achieve the effect of lifting the lens 1 on the eyeball 2.

In addition, the edge arc 122 of the positioning area 12 of the lens 1 is preferably designed with a slightly raised edge, which can be used to squeeze tears when blinking to promote tear circulation inside the lens 1, which can be used through tear circulation. The lens 1 and the cornea 22 of the eyeball 2 are continuously lubricated and oxygen is brought in to improve the comfort and wearability of the lens 1 .

The electronic device is used to simulate wearing the lens 1 on the cornea 22, and a calculation formula is used to calculate the amount of tear fluid between the cornea 22 and the base arc 111 and the inversion arc 112 of the lens 1. The calculation formula is:

When the present invention is actually used, the user can first wear the lens 1 on the eyeball 2 and make the inner surface of the lens 1 contact the surface of the cornea 22 of the eyeball 2. At this time, the inner surface of the lens 1 and the cornea 22 Tears with uneven thickness will be produced between the eyes. When the user blinks or goes to bed at night and closes the eyelids (not shown in the figure), the eyelids will press against the outer surface of the lens 1. At the same time, the eyelids and the lens The weight of 1 will generate a positive pressure, and exert a positive pressure on the epithelial cells at the center of the surface of the cornea 22 of the eyeball 2 through the tears between the base arc 111 of the treatment area 11 of the lens 1 and the cornea 22, and the cornea When the epithelial cells on the surface of cornea 22 are squeezed by tears, the central curvature of the cornea 22 will gradually become flatter, thereby thinning the central epithelial layer of the cornea 22 and thereby reducing the refractive power of the cornea 22 so that the visual imaging point moves toward the center of the eyeball 2 The direction of the retina 21 moves, thereby achieving the effect of reducing the degree of myopia or eliminating the degree of myopia.

Please refer to Figures 1, 2, 3, 4, 5, and 6 again. It can be clearly seen from the figures that the optical center of the orthokeratology sheet of the present invention and the design structure of the multi-arc lens , and the actual manufacturing of the lens 1 of the present invention may include the following steps:

(A) means that a corneal testing machine (not shown in the figure) can first be used to obtain the shape of the cornea 22 of the wearer's eyeball 2, so as to know the amount of tears required to produce peripheral defocusing in the shape of the cornea 22.

(B) Using an electronic device (not shown in the figure) to simulate wearing a preset shaping lens (not shown in the figure) on the cornea 22, and calculating the base curve of the cornea 22 and the preset shaping lens and tear volume between inversion arcs.

(C) The preset shaped lens is then calibrated. The correction operation is to adjust the eccentricity (E value) of the base curve of the preset shaped lens so that the eccentricity of the base curve is non-zero, thereby making the preset shaped lens The base curve of the shaped lens is aspherical, so that the eccentricity of the base curve can be adjusted to make the amount of tear fluid between the preset shaped lens and the cornea 22 conform to the amount of tear fluid required to produce peripheral defocusing due to the shape of the cornea 22 .

(D) The lens manufacturing machine (not shown in the figure) can be used to produce the lens 1 of the present invention according to the preset shaped lens.

The cornea detection machine in the above step (A) may include Manifest refraxtion, Schirmer, AxialLength, Topography, Auto-K or Corneal diameter and other parameters related to detecting the diopter, shape or radius of curvature of the cornea 22 of the eyeball 2 .

And the amount of tears required to produce the peripheral defocusing phenomenon in the above step (A) can be determined through wearing experiments (that is, testers with different cornea 22 shapes wear the test orthokeratology sheet). The tear volume required for the peripheral defocus phenomenon is obtained by establishing a database so that the database contains data on the tear volume required for various cornea 22 shapes to produce the peripheral defocus phenomenon).

The electronic device in the above step (B) can be an electronic device with computing functions such as a desktop computer, a notebook computer, or a tablet computer, and the electronic device can be installed with preset corneal remodeling sheet manufacturing software, and the software can be used to It is simulated to wear a preset shaping lens on the cornea 22, and a calculation formula is used to calculate the tear volume between the cornea 22 and the base arc and the inversion arc of the preset shaping lens, and the calculation formula can be:

As for the above calculation formula, BCW is the base curve width of the preset shaped lens, RCW is the reverse arc width of the preset shaped lens, f1(x) is the base curve inner surface of the preset shaped lens, f2 (x) is the inner surface of the inverted arc of the pre-shaped lens.

When the user wants to correct myopia or hyperopia (that is, the imaging distance of the eyeball 2 is too long or too short), the user can first wear the lens 1 on the eyeball 2 to allow the light to pass through the treatment area 11 of the lens 1, and when the light passes through the treatment area When the base arc 111 is 11, the eccentricity of the base arc 111 can be between -4 and 4, so the image shell 20 imaged on the retina 21 will have a non-circular arc shape. Compared with the arc-shaped image screen 20, the arc-shaped image screen 20 can increase the peripheral defocus area of the image on the retina 21, and because the peripheral defocus area increases, it is compared with the general lens 1 whose base arc 111 is spherical. , its myopia or hyperopia control effect is better.

In addition, when the user wants to correct myopia, the optimal eccentricity of the base arc 111 of the treatment area 11 can be set between 0 and 1. When the light passes through the base arc 111, the image can be formed on the retina 21 The eccentricity of the screen 20 is between 0 and 1, that is, it is non-arc-shaped (elliptical). Compared with the default spherical image screen 20, the non-arc-shaped image screen 20 can increase the number of images on the retina 21 The peripheral defocused area on the peripheral defocused image area 211 has a better myopia control effect.

The above descriptions are only preferred embodiments of the present invention, which do not limit the scope of the present invention. Therefore, any simple modifications and equivalent structural changes made by using the description and drawings of the present invention should be included in the scope of the present invention. Within the scope of protection of the present invention, it shall be clearly stated.

To sum up, the design structure of the optical center of the orthokeratology sheet and the multi-arc segment lens of the present invention can indeed achieve its effect and purpose when actually implemented and used. Therefore, the present invention is truly a creation with excellent practicality. .

Claims (8)

1. The design structure of the optical center and the multi-arc segment lens of the cornea molding sheet is that the lens is worn on the cornea surface of a preset eyeball, and is characterized in that the lens is the cornea molding sheet, the surface is in an aspheric shape, and the lens comprises a treatment area for light to pass through so as to image on the retina of the eyeball, and the treatment area comprises a base arc and a reverse arc; and a positioning area of the non-visual area outside the treatment area, wherein the positioning area comprises a parallel arc and a side arc, the treatment area comprises two sections of optical center inner arcs with different radian ratios and a tear height inner arc at the inner side of the base arc, and a reverse arc, a parallel arc and a side arc are sequentially arranged outside the tear height inner arc outwards.

2. The structure of claim 1, wherein the base curve eccentricity of the lens is-4 and the eccentricity of the image screen imaged on the retina of the predetermined eyeball is non-zero.

3. The optical center and multi-arc segment lens design structure of claim 1, wherein the optical center inner arc and the tear height inner arc of the lens have aspheric values Ai of:

BC1SAG-BC2wherein BC1 is the inner arc of the optical center, BC2 is the inner arc of the tear height, e is the eccentric value, c is the curvature value, r is the curvature radius of the lens, A _i Is the non-spherical value, P, of the tear level inner arc BC2 _i (x, y) is a function of the coordinate values of the radius of the lens on the coordinate axis.

4. The optical center and multi-arc lens design structure of the cornea molding sheet as defined in claim 3, wherein the optical center inner arc and the tear of the lensThe eccentricity value e of the inner arc of the liquid height is as follows:

5. the structure of claim 1, wherein the ratio of the inner arc of the optical center to the inner arc of the tear height of the base curve of the lens is 2:1, and when the length of the inner tear-height arc is 6mm, the angle of the inner optical center arc is 1.78 °, and the angle of the inner optical center arc+the inner tear-height arc is 2.34 °.

6. The structure of claim 1, wherein the ratio of the inner arc of the optical center to the inner arc of the tear height of the base curve of the lens is 2:1, and when the length of the inner tear-height arc is 5.5mm, the angle of the inner optical center arc is 1.657 °, and the angle of the inner optical center arc+the inner tear-height arc is 2.238 °.

7. The structure of claim 1, wherein the ratio of the inner arc of the optical center to the inner arc of the tear height of the base curve of the lens is 2/3:1/3 or 3/4:1/4, and the length from the center point of the inner arc of the optical center to the intersection point position of the inner arc of the tear height and the positioning area is 3.25 mm-5.25 mm.

8. The structure of claim 1, wherein the center point is formed at the center of the base curve of the lens, the lens is simulated by an electronic device and the tear between the base curve and the reverse curve of the cornea and the lens is calculated by a calculation formula, the calculation formula is that The BCW of the calculation formula is the base arc width of the lens, RCW is the reverse arc width of the lens, f1 (x) is the base arc curved surface of the lens, and f2 (x) is the reverse arc curved surface of the lens.