TWI739173B - Manufacturing method of aspheric lens using E value to control the growth rate of eyeball - Google Patents

Abstract

The present invention relates to an aspheric lens manufacturing method that uses E value to control the growth rate of the eyeball. The treatment area of the lens includes a base arc with a non-zero eccentricity, and the image screen can be imaged on the retina through the base arc The eccentricity is non-zero to increase the peripheral defocus area imaged on the retina, thereby effectively controlling myopia or hyperopia, thereby achieving the purpose of correcting myopia or hyperopia.

Description

Aspheric lens manufacturing method using E value to control eyeball growth speed

The present invention relates to an aspheric lens manufacturing method that uses the E value to control the growth rate of the eyeball. In particular, the treatment area of the lens makes the eccentricity of the image screen on the retina non-zero through a base arc with a non-zero eccentricity, so as to increase the imaging effect. The peripheral defocus area on the retina effectively controls myopia or hyperopia.

According to, with the development and innovation of various electronic and electrical products, it has brought people a lot of convenience in daily life and work, especially the advent of a large number of electronic products, and has led to the popularization of applications in communications and the Internet, resulting in many People are immersed in the field of use of electronic products, and a large number of electronic products are used for a long time, whether it is office workers, student groups, middle-aged and elderly people, etc., covering a wide range, which in turn derives the phenomenon of bowed heads, and thus creates many People's eyesight loss, injuries and other conditions are becoming more serious, and the myopia population is relatively increasing.

Furthermore, people’s nearsightedness is caused by the mismatch between the eye’s light bending ability and the length of the eye. It may be that the eye axis is too long or the corneal arc is too steep, causing the imaging point of the visual object to fall in front of the retina. It causes blurring of vision when imaging, so in order to correct myopia, it is necessary to reduce the tortuosity of the eye's light. Since the cornea's light tortuosity accounts for about 80% of the entire eye, the effect of correcting myopia can be achieved by reducing the refractive power of the cornea. .

At present, the main ways to correct refractive errors are to wear glasses to correct and wear invisible There are several methods of lens correction, corneal myopia surgery or wearing orthokeratology lenses. The above methods have their own advantages and disadvantages. Here, the research is especially aimed at orthokeratology lenses, which are made of high-transmittance lenses. It is made of oxygen-hard material. When the lens is worn on the eyeball, a layer of unevenly distributed tear fluid will be sandwiched between the lens and the outer surface of the cornea of the eyeball. The positive pressure exerted by the tear fluid on the cornea can reduce The epithelial cells are squashed. At the same time, if the wearer uses the eyelid to close the eyes, it will exert a certain pressure on the cornea by the weight of the eyelid and the lens. If the wear time is sufficient, the central curvature of the cornea can be gradually increased. Flatten and gradually thin the central epithelial layer to flatten the center of the cornea, thereby reducing the refractive power of the cornea, thereby achieving the effect of correcting myopia and even returning to normal vision.

However, although general orthokeratology lenses can correct myopia, some people cannot effectively control the progression of myopia by wearing orthokeratology lenses, so that the degree of myopia will continue to grow, and orthokeratology lenses are in low power ( (Between about 50~400 degrees), because the base curve of the orthokeratology lens is spherical, the space formed by the spherical base curve and the inverted arc on one side for the accumulation of tears will be insufficient, so that Inability to effectively squeeze epithelial cells, resulting in poor myopia control.

Therefore, how to try to solve the above-mentioned deficiencies and inconveniences of conventional use is the direction that relevant industries in this industry urgently want to study and improve.

Therefore, in view of the above-mentioned deficiencies, the inventor collected relevant information, evaluated and considered from many parties, and based on the accumulated years of experience in this industry, through continuous trials and modifications, he designed this kind of E-value to control the speed of eyeball growth. Inventor of aspheric lens manufacturing method.

The main purpose of the present invention is that the treatment area of the lens includes a base arc with a non-zero eccentricity, through which the base arc can make the image screen eccentricity of the image on the retina non-zero, so as to increase the image on the retina. The peripheral defocus area can effectively control myopia or hyperopia, thereby achieving the purpose of correcting myopia or hyperopia.

The secondary objective of the present invention is that the surface of the lens is made through an aspherical type, which can have a better peripheral defocusing area at low power than conventional spherical type corneal plastic lenses, so as to achieve better The purpose of the control effect of myopia or hyperopia.

Another purpose of the present invention is to detect the shape of the cornea when the lens is manufactured, and then adjust the eccentricity of the base curve of the preset shaping lens to make the base curve aspherical, and then make the preset shaping lens and The amount of tears between the cornea meets the amount of tears required for the shape of the cornea to produce peripheral defocusing. This manufacturing method can easily make the amount of tears between the lens and the cornea really meet the required amount of tears, so as to reduce manufacturing errors. This achieves the purpose of improving product yield.

1: lens

11: Treatment area

111: base arc

112: Reverse arc

12: Positioning area

121: positioning arc

122: Edge Arc

2: eyeball

20: Video screen

21: Retina

211: Peripheral out-of-focus image area

22: cornea

The first figure is a schematic diagram of the optical path of the present invention.

The second figure is a cross-sectional side view of the present invention.

The third figure is a flow chart of the present invention.

In order to achieve the above-mentioned purpose and effect, the technical means and structure adopted by the present invention are illustrated below in detail to illustrate the features and functions of the preferred embodiments of the present invention, so as to fully understand.

Please refer to the first and second drawings, which are schematic diagrams and side cross-sections of the light path of the present invention The figure, as can be clearly seen from the figure, the lens 1 is a keratoplasty sheet with an aspheric surface and includes a treatment area 11 through which light passes to image the retina 21 of the eyeball 2, and The positioning area 12 of the non-visual area outside the treatment area 11, wherein: the treatment area 11 includes a non-zero base arc 111 (BC) with eccentricity (Eccentricity; E value), and a matching base arc 111 is formed outside the base arc 111 The reversal arc 112 (RC) that forms a gap with the eyeball 2 for the accumulation of tears.

The positioning area 12 includes a positioning arc 121 (AC) for stably fixing the lens 1 on the eyeball 2 and a side arc 122 (PC) located outside the positioning arc 121.

Moreover, the eccentricity of the base arc 111 of the treatment area 11 of the lens 1 is non-zero, and when the eccentricity is between 0 and 1, the surface of the base arc 111 is elliptical.

Please refer to the third figure again, which is a flowchart of the present invention. It can be clearly seen from the figure that when the lens 1 of the present invention is actually manufactured, the following steps may be included:

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

(B) Use 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 calculate the base curve of the cornea 22 and the preset shaping lens And reverse the amount of tears between arcs.

(C) Perform a calibration operation on the preset plastic lens. The calibration operation is to adjust the eccentricity (E value) of the base arc of the preset plastic lens so that the eccentricity of the base arc is non-zero, and the preset plastic The base curve of the shaped lens is aspherical, which can adjust the eccentricity of the base curve to make the amount of tears between the preset shaped lens and the cornea 22 conform to the shape of the cornea 22 to produce peripheral defocusing. The amount of tears needed.

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

The corneal inspection machine in the above step (A) is a machine that can include parameters such as Manifest refraction, Schirmer, Axial Length, Topography, Auto-K, or Corneal diameter for detecting the refractive power, shape or radius of curvature of the cornea 22 of the eyeball 2 .

And the amount of tears required to produce peripheral defocusing phenomenon in the above step (A) can be obtained through a wearing experiment (that is, through a tester with different corneal 22 shapes to wear the corneal shaping sheet for the test, to know the The amount of tears required for the peripheral defocusing phenomenon is established, and a database is built so that the database contains data on the amount of tears required for the peripheral defocusing phenomenon caused by various corneal 22 shapes).

Furthermore, the electronic device in the above step (B) can be an electronic device with arithmetic functions such as a desktop computer, a notebook computer, or a tablet computer, and the electronic device can be installed with preset corneal plastic sheet manufacturing software. The software can be used to simulate wearing a preset shaping lens on the cornea 22, and the calculation formula can be used to calculate the amount of tears between the base and reversal arcs of the cornea 22 and the preset shaping lens, and the calculation formula Can be:

Among them: BCW is the base arc width of the preset plastic lens, RCW is the reverse arc width of the preset plastic lens, f1(x) is the inner surface of the base arc of the preset plastic lens, f2(x) is the preset Set the reversal arc inner surface of the shaping 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 lens 1 can be worn on the eyeball 2 first, so that the light passes through the treatment area 11 of the lens 1, and when the light passes through the treatment When the base arc 111 of the zone 11, the eccentricity of the base arc 111 is non-zero, so that the image shell 20 imaged on the retina 21 is non-arc-shaped, and its non-arc-shaped image screen 20 Compared with the arc-shaped image screen, the peripheral defocus area of the image on the retina 21 can be increased, and because the peripheral defocus area is increased, it has a better myopia or hyperopia control effect than the general lens with a spherical base arc. good.

Furthermore, when the user wants to correct myopia, the 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 imaged on the retina 21. The eccentricity of 20 is between 0 and 1, that is, it is non-circular (elliptical). Compared with the default spherical image screen A, the non-circular image screen 20 can increase the image on the retina 21 The peripheral out-of-focus area on the peripheral out-of-focus image area 211 has a better myopia control effect.

The present invention has the following advantages:

(1) When the lens 1 is worn on the eyeball 2, since the eccentricity of the base arc 111 of the treatment area 11 is non-zero, the eccentricity of the image screen 20 imaged on the retina 21 can be made non-zero to increase the image on the retina The peripheral defocus area on 21 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.

(2) The surface of the lens 1 is made through an aspherical type, which is lower in power (between about 50 and 400 degrees) or can be used in comparison with conventional spherical keratoplastic lenses. The base arc 111 and the reversal arc 112 form more space for the accumulation of tear fluid, and thus can have a better peripheral defocus area, thereby having a better myopia or hyperopia control effect.

(3) When the lens 1 is manufactured, the shape of the cornea 22 is detected first, and then the eccentricity of the base curve of the preset shaping lens is adjusted to make the base curve aspherical, so that the preset shaping lens and the cornea 22 The amount of tears between the lens 1 and the cornea 22 can easily match the amount of tears between the lens 1 and the cornea 22 to reduce the manufacturing error. To improve product yield.

Therefore, the above are only preferred embodiments of the present invention, and are not limited to the scope of the present invention. The present invention is mainly aimed at the treatment area 11 of the lens 1 including the base arc 111 with non-zero eccentricity. The eccentricity of the image screen 20 imaged on the retina 21 can be made non-zero through the base arc 111, so as to increase the peripheral defocus area imaged on the retina 21, thereby effectively controlling myopia or hyperopia, so as to correct myopia. Or the effect of hyperopia, so all structures and devices that can achieve the aforementioned effects should be covered by the present invention. Such simple modifications and equivalent structural changes should be included in the scope of the patent of the present invention for the same reason. .

To sum up, the present invention uses the E value to control the eyeball growth speed of the aspheric lens manufacturing method in actual application and implementation, in order to achieve its efficacy and purpose, so the present invention is a research and development with excellent practicability. The application requirements for invention patents are filed in accordance with the law. I hope that the review committee will grant the approval of this case as soon as possible to protect the inventor’s hard research and development. Really feel good.

1: lens

11: Treatment area

111: base arc

112: Reverse arc

12: Positioning area

121: positioning arc

122: Edge Arc

2: eyeball

20: focus

21: Retina

211: Peripheral out-of-focus image area

22: cornea

Claims (2)

An aspheric lens manufacturing method that uses E value to control the growth rate of the eyeball. It includes the following steps: (A) First use a cornea inspection machine to obtain the shape of the wearer’s cornea, so as to know that the corneal shape produces peripheral deviations. The amount of tears required for the focal phenomenon; (B) and use an electronic device to simulate wearing a preset shaping lens on the cornea, and calculate the amount of tears between the base and reversal arcs of the cornea and the preset shaping lens ; (C) Then perform a correction operation on the preset plastic lens, which is to adjust the eccentricity of the base curve of the preset plastic lens so that the eccentricity of the base curve is non-zero, and then the base curve of the preset plastic lens The arc is aspherical, by which the eccentricity of the base arc is adjusted to make the amount of tear fluid between the preset shaping lens and the cornea meet the amount of tear fluid required for the shape of the cornea to produce peripheral defocusing; (D) Convenient lens manufacturing The machine produces the lens according to the preset shaping lens. The method for manufacturing an aspheric lens using E value to control the growth rate of the eyeball as described in the first item of the scope of patent application, wherein the electronic device uses an algorithm to calculate the tears between the base and reversal arcs of the cornea and the preset plastic lens Volume, and the calculation formula is tear volume =

, And the BCW is the base arc width of the preset plastic lens, RCW is the reversal arc width of the preset plastic lens, f1(x) is the base arc curved surface of the preset plastic lens, and f2(x) is the preset The reversal curved surface of the shaping lens.

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