Patent ID: 12197046

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring toFIGS.1,2and3, as shown in the drawings, it can be clearly seen that the aspheric lens of the present invention uses E-value to control the eyeball growth rate. The lens1is an orthokeratology lens and the surface is aspheric. The lens1comprises a treatment zone11through which light passes to image at the retina21of the eyeball2, and a positioning zone12of the non-visual area outside the treatment zone11.

The treatment zone11comprises a base curve111(BC) whose eccentricity (E-value) can be between −4 and 4, and a reverse curve112(RC) formed on the outside of the base curve111to form a gap between the base curve111and the eyeball2for the accumulation of tears.

The positioning zone12comprises an alignment curve121that allows the lens1to be firmly fixed on the eyeball2, and a peripheral curve122(PC) located outside the alignment curve121.

The base curve111eccentricity of the treatment zone11of the lens1can be between −4 and 4, and when the eccentricity is between 0 and 1, the surface of the base curve111has an elliptical shape.

The above-mentioned lens1is provided with the alignment curve121and the peripheral curve122of the positioning zone12from the outer side of the base curve111and the reverse curve112of the treatment zone11to the outside in sequence. A center point100is formed in the center of the base curve111. The junction of the base curve111and the reverse curve112forms a first point of intersection101, the junction of the reverse curve112and the alignment curve121forms a second point of intersection102, and the junction of the alignment curve121and the peripheral curve122forms a third point of intersection103. The linear distance between the center point100of the base curve111and the cornea of the preset eyeball is between 9 μm˜21 μm. The linear distance between the first point of intersection101at the junction of the base curve ill and the reverse curve112and the cornea22of the preset eyeball2is between 89 μm˜189 μm. This way effectively controls myopia or hyperopia, to achieve the purpose of correcting myopia or hyperopia. The eccentricity of the base curve111of the treatment zone11of the aforementioned lens1can be between −4˜4, and the eccentricity of the image shell imaged on the retina21of the preset eyeball2is non-zero. The reverse curve112of the treatment zone11of the lens1is aspherical, and the linear distance between the second point of intersection102between the reverse curve112and the alignment curve121of the positioning zone12and the cornea22of the preset eyeball2can be between 15 μm˜25 μm. As for the third point of intersection103between the alignment curve121and the peripheral curve122of the positioning zone12of the lens1is in contact with the surface of the cornea22of the preset eyeball2.

The linear distance between the second point of intersection102between the reverse curve112of the treatment zone11and the alignment curve121of the positioning zone12of the lens1and the cornea22of the eyeball2is between 15 μm˜25 μm. Since the base curve111and the reverse curve112of the lens1are aspherical, the aspherical design can be used to ensure that the linear distance between the second point of intersection102and the cornea22of the eyeball2is between 15 μm˜25 μm, which can improve the manufacturing accuracy. Because the base curve111of the lens1is aspherical (eccentricity is non-zero), the eccentricity of the image shell20imaged on the retina21of the eyeball2can be made non-zero, to increase the peripheral defocus area of the image on the retina21, and then effectively control the speed of eye axial length change (lengthening or shortening), thereby effectively controlling myopia or hyperopia, thereby achieving the effect of correcting myopia or hyperopia.

Furthermore, the third point of intersection103between the alignment curve121and the peripheral curve122of the positioning zone12of the lens1is in contact with the surface of the cornea22of the eyeball2. Because the lens1is arc-shaped, the closer the lens1is to the outer periphery, the larger the circumference, so that when the third point of intersection103contacts the surface of the cornea22of the eyeball2, the contact part is the most, so that when the eyelid is closed on the lens1, the lens1is not prone to shaking, which can reduce the offset of the lens1, thereby improving the accuracy of squeezing, to surely squeeze the surface of the cornea22.

Furthermore, the preset curve of the base curve111of the treatment zone11of the lens1is greater than the horizontal curve of the cornea22of the eyeball2(that is, the curve of the base curve ill is flatter than the horizontal curve of the cornea22). Since the curve of the base curve11is greater than the curve of the cornea22, when the lens1is worn on the eyeball2, the tear between the base curve111and the cornea22can generate a positive pressure on the epithelial cells of the cornea22. In addition, the reverse curve112of the lens1can store tears, and the negative pressure provided by the tears can achieve the effect of improving the positioning of the lens1on the eyeball2.

The peripheral curve122of the positioning zone12of the lens1preferably has a slightly raised edge design. It can squeeze the tears during blinking to promote the tear circulation inside the lens1, and the tear circulation can make the lens1and the cornea22of the eyeball2continue to lubricate and bring in oxygen, to improve the comfort of wearing and wearability.

In addition, an electronic device is used to simulate wearing the above-mentioned lens1on the cornea22, and a calculation formula is used to calculate the amount of tears between the cornea22and the base curve111and reverse curve112of the lens1. The formula is

tear⁢volume=∫0BCW/2f⁢1⁢(x)⁢dx+∫BCW/2(BCW/RCW)/2f⁢2⁢(x)⁢dx.

When the present invention is used, the user can first put the lens1on the eyeball2and make the inner surface of the lens1contact the surface of the cornea22of the eyeball2. At this time, tears with uneven thickness will be generated between the inner surface of the lens1and the cornea22. When the user blinks or goes to bed at night to close the eyelid (not shown in the drawing), the eyelid will press against the outer surface of the lens1, and at the same time, the weight of the eyelid and the lens1will generate a positive pressure. The tear between the base curve111of the treatment zone11of the lens1and the cornea22exerts a positive pressure on the epithelial cells at the center of the surface of the cornea22of the eyeball2. The epithelial cells on the surface of the cornea22are squeezed by the tear, and the central curve gradually becomes relatively flat. Thereby, the central epithelial layer of the cornea22is thinned, thereby reducing the refractive power of the cornea22, so that the imaging point of the visual object is moved in the direction of the retina21of the eyeball2, thereby achieving the effect of reducing the power of myopia or eliminating the power of myopia.

Please refer toFIGS.1,2,3, and4again. It can be clearly seen from the drawings that the aspheric lens of the present invention uses E-value to control eyeball growth rate, and the lens1of the present invention is manufactured. It can include the following steps:(A) Use a corneal inspection machine (not shown) to obtain the shape of the cornea22of the wearer's eyeball2, to know the amount of tears required for the shape of the cornea22to create peripheral defocusing.(B) Use an electronic device (not shown) to simulate wearing the preset orthokeratology lens (not shown) on the cornea22and calculate the tear volume between the cornea22and the base curve and reverse curve of the preset orthokeratology lens.(C) Perform a calibration operation on the preset orthokeratology lens. The calibration operation is to adjust the eccentricity (E-value) of the base curve of the preset orthokeratology lens so that the eccentricity of the base curve is non-zero, so that the base curve of the preset orthokeratology lens is aspherical. In this way, the eccentricity of the base curve can be adjusted to make the tear volume between the preset orthokeratology lens and the cornea22conform to the tear volume required for the shape of the cornea22to create peripheral defocusing.(D) Use a lens manufacturing machine (not shown) to produce the lens1of the present invention according to the preset orthokeratology lens.

The corneal inspection machine in the above step (A) is a machine for detecting the diopter, shape, or radius of curvature of the cornea22of the eyeball2, such as Topography, Auto-K or any machine can inspect the Manifest refraction, Schirmer, Axial Length, or Corneal diameter, etc.

The tear volume required to create peripheral defocus in the above step (A) can be obtained through a wearing experiment (that is, subjects with different cornea22shapes wear the cornea orthokeratology lens used for the test to know the tear volume required to create peripheral defocusing, and then build a database to make the database contain the tear volume data required for various cornea22shapes to create peripheral defocus).

The electronic device of 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 a preset cornea orthokeratology lens manufacturing software, which can be used to simulate wearing the preset orthokeratology lens on the cornea22and calculate the tear volume between the cornea22and the base curve and reverse curve of the preset orthokeratology lens. The formula can be:

tear⁢volume=∫0BCW/2f⁢1⁢(x)⁢dx+∫BCW/2(BCW/RCW)/2f⁢2⁢(x)⁢dx

In the above calculation formula, BCW is the width of the base curve of the preset orthokeratology lens, RCW is the width of the reverse curve of the preset orthokeratology lens, f1(x) is the inner surface of the base curve of the preset orthokeratology lens, and f2(x) is the inner surface of the reverse curve of the preset orthokeratology lens.

When the user wants to correct myopia or hyperopia (that is, the imaging distance of the eyeball2is too long or too short), the lens1can be worn on the eyeball2first, so that the light can pass through the treatment zone11of the lens1. When the light passes through the base curve111of the treatment zone11, the eccentricity of the base curve111can be between −4˜4, so that the image shell20imaged on the retina21is non-circular arc shape. The non-circular arc shape image shell20can increase the peripheral defocus area of the image on the retina21compared to the circular arc shape image shell, and due to the increase in the peripheral defocus area, compared to the general lens whose base curve is spherical, its myopia or hyperopia control effect is better.

Furthermore, when the above-mentioned user wants to correct myopia, the preferred eccentricity of the base curve111of the treatment zone11can be set between 0 and 1. When the light passes through the base curve111, the eccentricity of the image shell20imaged on the retina21can be between 0 and 1, which is a non-circular arc shape (ellipse). Compared with the preset spherical image shell A0, the non-circular arc shape image shell20can increase the peripheral defocus area on the peripheral out-of-focus image area211of the retina21, to have a better myopia control effect.