CN113514961B - Continuous zoom contact lenses with peripheral myopic defocus - Google Patents

Abstract

A full-focus depth-of-field myopia control contact lens comprises an optical zone formed by taking a presumed central optical axis as a circle center, wherein the diopter of the optical zone is continuously changed from a circular area outside the presumed central optical axis, a first diopter of the optical zone forms a corresponding first focal length, a second diopter of the optical zone forms a corresponding second focal length, a depth-of-field range is a difference range between the first focal length and the second focal length, an image quality formed in the depth-of-field range is better than an image quality formed outside the depth-of-field range, a defocus zone is formed in another circular area extending outwards from the optical zone, and the diopter of the defocus zone is continuously changed from one side close to the optical zone to one side far away from the optical zone.

Description

Continuous zoom contact lenses with peripheral myopic defocus

technical field

The present invention relates to contact lenses, in particular to a contact lens that prevents and controls myopia by peripheral myopia defocusing and has a continuous zoom function.

Background technique

In recent years, due to the prevalence of 3C products, more and more schoolchildren and even preschool children have the problem of myopia. Not only in their own country, but also the proportion of children with myopia all over the world has rapidly increased. If it is not controlled and corrected, mild myopia will continue to deepen and become high myopia. High myopia will cause many eye-related complications, and even cause blindness in severe cases.

Generally common methods of myopia control and correction can be divided into two methods: optical and non-optical. Non-optical methods are currently in Taiwan, China, using long-acting mydriatics and night-time orthokeratology tablets. Although mydriatics are economical and effective, it is a pity that after using mydriatics, the eyes will have strong photophobia. They often have to squint and cannot open their eyes outdoors. In the beginning, close objects are difficult to see when using mydriatics. The disadvantage of Orthokeratology is that the cost of lens, disinfectant and consultation is high, and because Orthokeratology is made of hard material, it is obviously difficult to adapt to the foreign body sensation at the beginning of wearing. In addition to the above disadvantages, if the wearer does not properly disinfect Orthokeratology, the risk of eyeball infection will be greatly increased.

In view of this, how to solve the above problems is the primary issue to be solved by the present invention.

Contents of the invention

The main purpose of the present invention is to provide a full-focus depth-of-field myopia control contact lens, which has the effect of relieving eye pressure and controlling the increase of myopia degree.

In order to achieve the above-mentioned purpose, the present invention provides a full-focus depth-of-field myopia control contact lens, which includes an optical zone, which is a circular area formed by an assumed central optical axis as the center of a circle. The diopter of the optical zone is continuously changed by the circular area outside the assumed central optical axis. A first diopter of the optical zone forms a corresponding first focal length, and a second diopter of the optical zone forms a corresponding second focal length.

A depth of field range is the range of the difference between the first focal length and the second focal length, and the quality of an image formed within the depth of field range is better than that formed outside the depth of field range. An out-of-focus area is another circular area extending outward from the optical area. The diameter of the out-of-focus area is larger than the diameter of the optical area. The diopter of the out-of-focus area changes continuously from the side close to the optical area to the side far away from the optical area.

Preferably, the ADD of the depth of field range is between 0.25 and 4.0D.

Preferably, the focal length within the depth of field ranges from the first focal length to the second focal length in a continuous increasing or decreasing trend.

Preferably, the focal length within the depth-of-field range from the first focal length to the second focal length first decreases and then gradually increases.

Preferably, the focal length within the depth of field ranges from the first focal length to the second focal length in a trend of increasing first and then decreasing.

Preferably, the diopter of the out-of-focus area first increases gradually and then decreases from the inner side to the outer side of the other circular area.

Preferably, the ADD of the out-of-focus region is between 1.0 and 11.0D.

Preferably, when the first diopter is between 0.0D and -4.0D, the ADD of the out-of-focus area is 4.0D.

Preferably, when the first diopter is between -4.0D and -10.0D, the first diopter is proportional to the ADD of the out-of-focus area.

Preferably, the maximum defocus amount of the defocus area is higher than +0.0D.

However, the above objects and advantages of the present invention can be easily understood from the following detailed descriptions and accompanying drawings of selected embodiments.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will give a brief introduction to the accompanying drawings required in the description of the embodiments or prior art. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other accompanying drawings can also be obtained according to these drawings without creative work.

Fig. 1 is the plane schematic diagram of the myopia control contact lens of full focal depth of field of the present invention;

Fig. 2 is a schematic plan view of the optical zone and the depth of field range of the present invention;

Fig. 3 is a schematic diagram of the imaging state of a myopic patient wearing a concave lens;

Fig. 4 is a schematic diagram of a myopic patient wearing the imaging mode of the present invention;

Fig. 5 is a diopter distribution diagram of the first embodiment of the present invention;

Fig. 6 is a diopter distribution diagram of the second embodiment of the present invention;

Fig. 7 is a distribution diagram of various diopters in the present invention.

Among them, full focal depth of field myopia control contact lens 1; optical zone 10; first diopter 11; first focal length 111; second diopter 12; second focal length 121;

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to Fig. 1 and Fig. 2, the first embodiment shown in the figure is the selected first embodiment of the present invention, which is for illustration only, and is not limited by the embodiment in the patent application.

The first embodiment of the present invention provides a full focal depth of field myopia control contact lens 1 with peripheral myopia defocus, comprising an optical zone 10, a depth of field range 20 and a defocus zone 30, wherein:

The optical zone 10 takes the center of the all-focus depth-of-field myopia control contact lens 1 as a hypothetical central optical axis L, and surrounds the hypothetical central optical axis L as a circle center to form a circular area with a diameter of 0.5 mm to 4 mm. The radius of curvature (base curve, Base Curve) of the inner surface of the optical zone 10 is between 8.0 mm and 9.0 mm. If the base curve of the lens is too large, the problem of the lens not sticking to the eyeball and easy to shift may occur. If the base curve of the lens is too small, it is easy to cause the eyes to feel tight and uncomfortable. Generally, the base curve of the lens is about 1.1 times the base curve of the eyeball. In addition, in this embodiment, the all-focus depth-of-field myopia control contact lens 1 is formed by an aspherical front curve and a single curvature of the back curve. The optical system formed, in other embodiments, the full-focus depth-of-field myopia control contact lens 1 can be an optical system composed of a single curvature in the front arc and an aspheric surface in the back arc, or an optical system composed of aspheric surfaces in both the front arc and the back arc. The above optical systems all belong to the protection scope of the present invention.

The equation of the aspheric optical system of the present invention is as follows:

Z = surface profile of the surface parallel to the optical axis,

s = radial distance from the optical axis,

C = curvature, reciprocal of radius,

k = conic constant,

A4, A6, A8...=4th, 6th, 8th...Aspherical coefficient

When k=0, the conical surface is a spherical surface; when k>-1, the conical surface is an ellipse; when k=-1, the conical surface is a paraboloid; when k<-1, the conical surface is a hyperboloid.

The all-focus depth-of-field myopia control contact lens 1 of the aspheric optical system provided by the present invention can be manufactured through existing manufacturing methods, which can be roughly divided into three types: Lathe Cutting, Cast Molding, and Spin Casting.

The full-focus depth-of-field myopia control contact lens 1 of the present invention can be made of the following materials: hydroxyethyl methacrylate (HEMA), methyl methacrylate (MMA), methyl methacrylate (MMA) and glycerin acrylate copolymer, hydrophilic hydrogel, hydrophobic silicone hydrogel, the above materials are only listed and do not limit the optional materials of the present invention.

The all-focus depth-of-field myopia control contact lens 1 of the present invention is suitable for various types of soft contact lenses, such as silicone hydrogel soft contact lenses, multi-focus soft contact lenses, water ladder soft contact lenses, astigmatism soft contact lenses, water gel soft contact lenses, blue light filtering soft contact lenses, and colored soft contact lenses. The all-focus depth-of-field myopia control contact lens 1 of the present invention is suitable for various hard contact lenses, such as night-wear hard contact lenses, astigmatism hard contact lenses, aspheric hard contact lenses, and keratoconus special hard contact lenses.

In this embodiment, the diameter of the optical zone 10 is 0.5 mm to 4 mm. In actual structural design, the diameter of the optical zone 10 is not limited to the range of 0.5 mm to 4 mm, and can be adjusted according to imaging quality or manufacturing technology. The diopter of the optical zone 10 is continuously changed radially outward from the hypothetical optical axis L. Furthermore, the diopter of the optical zone 10 is continuously increasing radially outward from the hypothetical optical axis L. The diopter of the optical zone 10 can also be continuously decreasing radially outward from the hypothetical optical axis L. The setting of the aforementioned trend can be adjusted according to the actual needs of the wearer. The setting of the trend also includes the initial diopter of the optical zone 10. For example, if the wearer is a hyperopic patient, The diopter suitable for hyperopic patients should be used as the starting value.

Please refer to FIG. 2 again, the position of the optical zone 10 adjacent to the hypothetical central optical axis L has a first diopter 11, and the first diopter 11 forms a corresponding first focal length 111. 21. The distance between the first focal length 111 and the second focal length 121 forms the depth of field range 20. The quality of an image formed within the depth of field range 20 is better than that formed outside the depth of field range 20. In other words, the depth of field range 20 has the effect of correcting vision. The ADD of the depth of field range 20 is between 0.25 and 4.0D. It is worth noting that since the first diopter 11 and the second diopter 12 are continuously changing Therefore, the change of the focal length within the depth of field range 20 formed by the first focal length 111 and the second focal length 121 is also a gradual change trend.

When the wearer is watching objects at different distances, the wearer's brain can judge the distance and select the most appropriate focal length from the depth of field range 20, so that the target object can be accurately imaged on the wearer's retina to produce a clear visual image. When the wearer is gazing at a distant object, the wearer's brain can select the most suitable focal length for seeing distant objects from the depth of field range 20, so that the wearer can clearly see the distant object. In addition, since the focal length within the depth of field range 20 changes continuously, the wearer will not see visual jumps due to the sudden change of the focal length when switching from near to far. Avoid dizzy discomfort for the wearer.

The all-focus depth-of-field myopia control contact lens 1 provided by the present invention is also suitable for wearers with reduced lens adjustment function. When the wearer with reduced lens adjustment function wants to look at a near-distance target, the wearer's brain can select the focal length for viewing near objects from the depth of field range 20. Therefore, even if the curvature of the lens does not change significantly for focusing, the target object can be accurately imaged on the wearer's retina, thereby producing a clear visual image.

The out-of-focus area 30 is another circular area extending outward from the optical area 10. It is a circular area with a diameter of 4mm to 9mm surrounded by the hypothetical central optical axis L as the center of the circle. In actual structural design, the diameter of the out-of-focus area 30 is not limited to the range of 4mm to 9mm, and can be adjusted according to imaging quality or manufacturing technology; the diopter of the out-of-focus area 30 changes continuously from the inner side to the outer side of the circular area, and the ADD of the out-of-focus area 30 is between 1.0 and 11.0D. Furthermore, the diopter of the out-of-focus area 30 shows a trend of increasing first and then decreasing from the inner side to the outer side of the circular area. The setting of the aforementioned trend and the ADD value of the out-of-focus area 30 can be adjusted according to actual needs.

Please refer to Figure 3 and Figure 4. Compared with normal eyesight, myopia patients have excessively large corneal diopter or longer eye axis, so that after light enters the eyeball, it will be imaged in front of the retina, and the target object can be imaged on the retina after being corrected by using a concave lens. In order to catch up with the peripheral focal point falling on the back of the retina, the eye axis will be continuously elongated and the degree of myopia will be continuously deepened. However, the present invention uses the out-of-focus area 30 to change the peripheral optical design of the full-focus depth-of-field myopia control contact lens 1, so that the light around the full-focus depth-of-field myopia control contact lens 1 enters the eyeball and forms an image in front of the retina to form a state of peripheral myopia defocus (as shown in FIG. 4 ), thus reducing the risk of eye axis elongation.

Please refer to FIG. 5 , the full-focus depth-of-field myopia control contact lens 1 provided by the first embodiment of the present invention, in this embodiment, the optical zone 10 is a circular area with a diameter of 0.5 mm to 4 mm surrounded by the hypothetical central optical axis L, and the defocused area 30 is a circular area with a diameter of 4 mm to 9 mm, wherein the circular area of 6 mm to 7 mm in the defocused area 30 has the maximum defocus.

In the optical zone 10, the position away from the hypothetical central optical axis L has the first diopter -6.00D, the position distanced from the hypothetical central optical axis L has the second diopter -5.00D, the ADD of the depth of field range 20 is 1.0, and the diopter within the depth of field range 20 is continuously increasing from the first diopter 11 to the second diopter 12. When the wearer is viewing objects at different distances, the wearer's brain can select the most appropriate diopter from the depth of field range 20 (-5.00D to -6.00D), so that the target object can be accurately imaged on the retina to produce a clear visual image, and because the diopter within the depth of field range 20 is continuously increasing, the wearer will not feel dizzy or uncomfortable due to the rapid change of the diopter when viewing near and far objects.

It is worth noting that the outward extension of the optical zone 10 to the out-of-focus zone 30 adopts a progressive defocus design, which means that the diopter from the optical zone 10 to the out-of-focus zone 30 shows a continuous and gradual increase trend, and there is a maximum defocus amount in the out-of-focus zone 30. In this embodiment, the ADD of the out-of-focus zone 30 is 5.0D. The target object can be imaged in front of the peripheral range of the retina instead of behind the retina, which can effectively solve the problem of the conventional eyeball tracking the focus that leads to the continuous deepening of the degree, and achieve the purpose of controlling the degree of myopia.

Please refer to FIG. 6 , the full-focus depth-of-field myopia control contact lens 1 provided by the second embodiment of the present invention, in this embodiment, the optical zone 10 is a circular area with a diameter of 0.5 mm to 4 mm surrounded by the hypothetical central optical axis L, and the defocused area 30 is a circular area with a diameter of 4 mm to 9 mm, wherein the circular area of 7 mm to 8 mm in the defocused area 30 has the maximum defocus.

In the optical zone 10, the position away from the hypothetical central optical axis L has the first diopter -6.00D, the position distanced from the hypothetical central optical axis L has the second diopter -5.00D, the ADD of the depth of field range 20 is 1.0, and the diopter within the depth of field range 20 is continuously increasing from the first diopter 11 to the second diopter 12. When the wearer is viewing objects at different distances, the wearer's brain can select the most appropriate diopter from the depth of field range 20 (-5.00D to -6.00D), so that the target object can be accurately imaged on the retina to produce a clear visual image, and because the diopter within the depth of field range 20 is continuously increasing, the wearer will not feel dizzy or uncomfortable due to the rapid change of the diopter when viewing near and far objects.

It is worth noting that the outward extension of the optical zone 10 to the out-of-focus zone 30 adopts a progressive defocus design, which means that the diopter from the optical zone 10 to the out-of-focus zone 30 first decreases and then gradually increases, and there is a maximum amount of defocus in the out-of-focus zone 30. In this embodiment, the ADD of the out-of-focus zone 30 is 5.0D, and the average diopter passing through the out-of-focus zone 30 is greater than the average diopter of the optical zone 10, resulting in myopia Defocusing allows the target object to be imaged in front of the peripheral range of the retina instead of behind the retina, which can effectively solve the problem of increasing degrees caused by eyeball tracking and achieve the purpose of controlling the degree of myopia.

Please refer to FIG. 7 , which shows the distribution diagram of the all-focus depth-of-field myopia control contact lens 1 at various diopters. It can be seen from the figure that the optical zone 10 is a circular area with a diameter of 0.5 mm to 4 mm surrounded by the hypothetical central optical axis L, and the out-of-focus area 30 is a circular area with a diameter of 4 mm to 9 mm. When -1.0D, -2.0D, -3.0D and -4.0D, the corresponding highest defocus positions (such as the vertical axis coordinates in Fig. 7) are 4.5D, 3.5D, 2.5D, 1.5D and 0.5D respectively. is 4.0D. And when the first diopter 11 is -5.0D, -6.0D, -7.0D, -8.0D, -9.0D and -10.0D, the position of the highest defocus amount of the out-of-focus area 30 (as shown in the vertical axis coordinates in Fig. 7) is 0.5D. The greater the ADD of the out-of-focus area 30 is, the greater the actual structural design, the ADD value of the out-of-focus area 30 is not limited to the above range, and can be adjusted according to the effect of myopia prevention and control or manufacturing technology.

It can be seen from the above embodiments that the advantages of the present invention are summarized as follows: 1. By selecting the most appropriate focal length from the depth of field range 20, the target object can be accurately imaged on the wearer's retina to produce a clear visual image. 2. Through the continuous change of the diopter in the optical zone 10 , the wearer will not feel dizzy or uncomfortable when changing the distance from near to far. 3. With the design of the out-of-focus area 30, the present invention not only has the advantage of relieving eyeball pressure, but also has the effect of slowing down the increase of myopia degree.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. a continuous zoom contact lens with peripheral myopia defocus, is characterized in that, comprises: An optical zone is a circular area formed by a hypothetical central optical axis as the center of the circle. The diopter of the optical zone changes continuously from the circular area outside the hypothetical central optical axis. A first diopter of the optical zone forms a corresponding first focal length, and a second diopter of the optical zone forms a corresponding second focal length; A depth of field range is the range of the difference between the first focal length and the second focal length, and the imaging resolution formed within the depth of field range is better than the imaging resolution formed outside the depth of field range; An out-of-focus area is another circular area extending outward from the optical area. The diameter of the out-of-focus area is larger than the diameter of the optical area. The diopter of the out-of-focus area changes continuously from the side close to the optical area to the side far away from the optical area. 2 . The continuous zoom contact lens with peripheral myopia and defocus according to claim 1 , wherein the ADD of the depth of field range is between 0.25 and 4.0D. 3 . 3 . The continuous zoom contact lens with peripheral myopia and defocus according to claim 1 , wherein the focal length within the depth of field range is continuously increasing or continuously decreasing from the first focal length to the second focal length. 4 . 4 . The continuous zoom contact lens with peripheral myopia and defocus according to claim 1 , wherein the focal length within the depth of field range from the first focal length to the second focal length first decreases and then gradually increases. 5 . The continuous zoom contact lens with peripheral myopia and defocus according to claim 1 , wherein the focal length within the depth of field range from the first focal length to the second focal length shows a trend of increasing first and then decreasing. 6 . The continuous zoom contact lens with peripheral myopia and defocus according to claim 1 , wherein the diopter of the defocus area first gradually increases and then decreases from the inner side to the outer side of another circular area. 7 . The continuous zoom contact lens with peripheral myopia defocus according to claim 6 , wherein the ADD of the defocus region is between 1.0 and 11.0D. 8. The continuous zoom contact lens with peripheral myopia and defocus according to claim 7, wherein when the first diopter is between 0.0D and -4.0D, the ADD of the defocus area is 4.0D. 9. The continuous zoom contact lens with peripheral myopia and defocus according to claim 7, wherein when the first diopter is between -4.0D and -10.0D, the first diopter is proportional to the ADD of the defocus area. 10. The continuous zoom contact lens with peripheral myopia and defocus according to claim 8 or 9, characterized in that the position of the highest defocus amount in the defocus area is above +0.0D.