CN211293490U - Corneal contact lens - Google Patents
Corneal contact lens Download PDFInfo
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- CN211293490U CN211293490U CN201922228749.2U CN201922228749U CN211293490U CN 211293490 U CN211293490 U CN 211293490U CN 201922228749 U CN201922228749 U CN 201922228749U CN 211293490 U CN211293490 U CN 211293490U
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Abstract
The utility model describes a corneal contact lens, it includes: an outer surface which is convex and is composed of an optical surface positioned at the center and a peripheral surface formed by surrounding the optical surface, wherein the curvature of the optical surface is smaller than that of the peripheral surface; and the inner surface is concave, the inner surface consists of a basal arc surface which is contacted with the cornea and provides optical correction action and a side arc surface which is formed by surrounding the basal arc surface, the side arc surface is respectively connected with the peripheral surface and the basal arc surface, the curvature of the basal arc surface is less than that of the peripheral surface, the curvature of the basal arc surface is greater than that of the front surface of the cornea, the inner surface has quadrant specificity, and the inner surface is matched with the shapes of different quadrants of the cornea through quadrant partition design. According to the utility model discloses can provide one kind and well-matched cornea contact lens of cornea.
Description
Technical Field
The utility model particularly relates to a corneal contact lens.
Background
A rigid oxygen permeable corneal contact lens (RGP) is a contact lens that is safe and effective for refractive correction, particularly for patients with high astigmatism, and is worn on the ocular surface using the siphonic principle without directly abrading the cornea, with less damage to the cornea, and that can be worn for extended periods of time. In recent years, rigid corneal contact lenses have rapidly become widespread worldwide due to the synthesis and application of high-molecular materials with high Dk values, high elastic modulus, hydrophilicity, precipitation resistance, and good biocompatibility.
Generally, the cornea of a human is in a non-absolute spherical shape, the shapes of the cornea in different quadrants and different axial directions are respectively one, most of RGPs are only designed in a spherical shape or designed aiming at the steepest and flattest parts, and cannot be well matched with the cornea, so that the comfortable experience of a wearer is reduced, and meanwhile, the RGPs designed in a multi-focus mode can be used for the myopia delay control.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned conventional circumstances, an object of the present invention is to provide a contact lens that can be well matched with the cornea.
To this end, the present invention provides a corneal contact lens, comprising: an outer surface having a convex shape, the outer surface being composed of an optical surface located at the center and a peripheral surface formed around the optical surface, the curvature of the optical surface being smaller than that of the peripheral surface; and an inner surface having a concave shape, the inner surface being composed of a basal arc surface which is in contact with a cornea and provides an optical corrective action, and a lateral arc surface formed around the basal arc surface, the lateral arc surface being connected to the peripheral surface and the basal arc surface, respectively, the curvature of the basal arc surface being smaller than the curvature of the peripheral surface, the curvature of the basal arc surface being larger than the curvature of the anterior surface of the cornea, and the inner surface having quadrant specificity, the inner surface being matched with the morphology of different quadrants of the cornea by a quadrant partition design.
The utility model discloses in, the corneal contact lens has surface and internal surface, and wherein the internal surface has the quadrant specificity, and the internal surface matches through the form of quadrant subregion design and the different quadrants of cornea, from this, the internal surface can match with the form of each quadrant cornea better, also can laminate with the corneal contact of each quadrant better, therefore can help dispersing the pressure that the corneal contact lens caused the cornea uniformly to can improve the security and the comfort level of corneal contact lens. In addition, the curvature of the optical surface is smaller than the curvature of the peripheral surface and the curvature of the basal arc surface is smaller than the curvature of the peripheral surface, which can contribute to forming the outer surface of the first predetermined shape and the inner surface of the second predetermined shape. In addition, the curvature of the basal plane surface is greater than the curvature of the anterior surface of the cornea, which can facilitate the formation of tear fluid space between the inner surface and the cornea.
Additionally, in the corneal contact lens of the present invention, optionally, the base curve surface is divided into 4 quadrants for quadrant division design, and the side curve surface is divided into 4 quadrants for quadrant division design. Therefore, the cornea contact lens can be better matched with the cornea shape of 4 quadrants, namely can be better contacted and attached with the cornea of 4 quadrants, so that the pressure on the cornea caused by the cornea contact lens can be uniformly dispersed, and the safety and the comfort of the cornea contact lens can be improved.
Further, in the contact lens of the present invention, optionally, the contact lens is fitted based on the corneal curvature and the corneal astigmatism value of the cornea. Therefore, the corneal contact lens can be matched with the cornea, and the wearing comfort and the vision correction definition can be improved.
Further, in the contact lens of the present invention, optionally, a diameter of the base curve surface is larger than a diameter of the optical surface. This can contribute to the defocus design of the front surface of the corneal contact lens.
In addition, in the contact lens according to the present invention, optionally, the contact lens is made of a hard highly oxygen permeable material, and the hard highly oxygen permeable material is one selected from the group consisting of siloxane methacrylate, fluorosilicone methacrylate, perfluoroether, and fluorinated siloxane. In this case, the oxygen permeability of the contact lens can be improved, the abrasion resistance of the contact lens can be improved, and the contact lens is beneficial to the production of the contact lens.
In the contact lens of the present invention, a tear space may be formed between the inner surface and the cornea when the contact lens is worn on an eyeball. Therefore, the abrasion of the cornea of the corneal contact lens can be reduced, and the wearing comfort can be improved.
Further, in the contact lens of the present invention, optionally, in the contact lens, a thickness between the peripheral surface and the basal arc surface gradually increases as approaching the basal arc surface. Thereby, the limbal region can be facilitated to support the contact lens for wearing on the cornea.
In addition, in the contact lens of the present invention, optionally, the contact lens is formed as a multifocal contact lens through an anterior surface defocusing design. In this case, a multifocal design on the anterior surface of the contact lens enables the contact lens to have different powers in different zones.
Additionally, in a corneal contact lens in accordance with the present invention, the corneal contact lens optionally has a distance vision zone and a defocus vision zone. Therefore, the corneal contact lens has the function of myopic defocus, so that the myopic deepening can be controlled or slowed down, and meanwhile, the demand of vision correction can be met.
Additionally, in the corneal contact lens of the present invention, optionally, the corneal contact lens has a graded diopter. Therefore, the corneal contact lens can effectively improve the vision condition and reduce the speed of myopia progression.
According to the utility model discloses can provide one kind and well-matched cornea contact lens of cornea.
Drawings
Fig. 1 is a schematic view showing a structure of a contact lens according to an example of the present invention.
Fig. 2 is a view showing an application scenario of a contact lens according to an example of the present invention.
Figure 3 is a cross-sectional view showing the outer surface of a corneal contact lens according to an example of the present invention.
Figure 4 is a cross-sectional view showing the inner surface of a corneal contact lens according to an example of the present invention.
Fig. 5 is a bottom view of a contact lens according to an example of the present invention.
Fig. 6 is a top view showing a contact lens according to an example of the present invention.
Fig. 7 is a distribution diagram showing the area of a contact lens according to an example of the present invention.
Detailed Description
All references cited in the present application are incorporated by reference in their entirety as if fully set forth. Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the same components are denoted by the same reference numerals, and redundant description thereof is omitted. The drawings are schematic and the ratio of the dimensions of the components and the shapes of the components may be different from the actual ones.
Fig. 1 is a schematic view showing a structure of a contact lens 1 according to an example of the present invention.
As shown in fig. 1, the contact lens 1 according to the present embodiment may include: an outer surface 10 which is convex, the outer surface 10 being composed of an optical surface 11 positioned at the center and a peripheral surface 12 formed around the optical surface 11, the curvature of the optical surface 11 being smaller than the curvature of the peripheral surface 12; and an inner surface 20 having a concave shape, the inner surface 20 being composed of a basal arc surface 21 which is in contact with the cornea 2 and provides an optical correction effect, and a side arc surface 22 formed around the basal arc surface 21, the side arc surface 22 being connected to the peripheral surface 12 and the basal arc surface 21, respectively, the curvature of the basal arc surface 21 being smaller than that of the peripheral surface 12, the curvature of the basal arc surface 21 being larger than that of the anterior surface of the cornea 2, and the inner surface 20 having quadrant specificity, the inner surface 20 matching the morphology of different quadrants of the cornea 2 by quadrant division design.
In the present embodiment, the contact lens 1 has an outer surface 10 and an inner surface 20, wherein the inner surface 20 has quadrant specificity, and the inner surface 20 is designed to match the shape of different quadrants of the cornea 2 through quadrant division, so that the inner surface 20 can better match the shape of the cornea 2 of each quadrant, i.e. can better contact and fit with the cornea 2 of each quadrant, thereby being capable of helping to uniformly disperse the pressure on the cornea 2 caused by the contact lens 1, and improving the safety and comfort of the contact lens 1. In addition, the curvature of the optical surface 11 is smaller than the curvature of the peripheral surface 12 and the curvature of the base arc surface 21 is smaller than the curvature of the peripheral surface 12, which can contribute to forming the outer surface 10 of the first predetermined shape and the inner surface 20 of the second predetermined shape. Furthermore, the base curve surface 21 has a curvature greater than the curvature of the anterior surface of the cornea 2, which can facilitate the formation of tear fluid space between the inner surface 20 and the cornea 2.
Fig. 2 is a view showing an application scene of the contact lens 1 according to an example of the present invention.
In some examples, as shown in fig. 2, when the contact lens 1 is worn on the eyeball, a tear space may be formed between the inner surface 20 and the cornea 2. This reduces wear of the cornea 2 by the contact lens 1, and improves wearing comfort.
In some examples, the tear space may be filled with tears. In other examples, the tear space may be filled with a therapeutic solution. Additionally, in some examples, the tear layer within the tear space may be formed as a tear mirror. This can contribute to astigmatism correction.
In some examples, the contact lens 1 may be fitted based on the corneal 2 curvature and the corneal 2 astigmatism values of the cornea 2. Therefore, the corneal contact lens 1 can be matched with the cornea 2, and the wearing comfort and the definition of vision correction can be improved. For example, the curvature of the base curve surface 21 of the inner surface 20 may be greater than the curvature of the cornea 2.
In some examples, the corneal contact lens 1 may be constructed of a rigid material. In other examples, the corneal contact lens 1 may be constructed of a rigid, highly oxygen permeable material. In this case, it is possible to make the contact lens 1 have good oxygen permeability, to improve the abrasion resistance of the contact lens 1, and to facilitate the production of the contact lens 1.
In some examples, the oxygen permeability coefficient (DK value) of the hard high oxygen permeable material may be from 100 to 200. For example, the DK value of the rigid high oxygen permeable material may be 100, 125 or 141.
In some examples, the stiff high oxygen permeable material may be one selected from the group consisting of silicone methacrylate, fluorosilicone methacrylate, perfluoroether, fluorinated silicone.
In some examples, the corneal contact lens 1 may have a diameter of 8.5mm to 12.0 mm. For example, the diameter D of the corneal contact lens 11May be 8.5mm, 8.8mm, 9mm, 9.2mm, 9.6mm, 10.0mm, 10.2mm, 10.5mm, 10.8mm, 11mm, 11.2mm, 11.5mm, 11.8mm or 12 mm.
Further, in some examples, the corneal contact lens 1 may be 0.10mm to 1.00mm thick. Therefore, the deformation of the contact lens 1 can be relieved, and the overweight of the contact lens 1 can be avoided. For example, the corneal contact lens 1 may have a thickness of 0.10mm, 0.12mm, 0.15mm, 0.18mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1 mm.
In some examples, the DK value of the contact lens 1 may be 100-. Thereby, the utility model has better oxygen permeability, so that tear can provide oxygen for the cornea 2, thereby being beneficial to keeping the cornea 2 healthy. For example, the DK value of the corneal contact lens 1 can be 100, 125, or 141.
In some examples, the contact lens 1 may be a hybrid contact lens that is a combination of both hard and soft lenses. In addition, in some examples, the central region of the contact lens 1 may be composed of a hard material and the peripheral region may be composed of a soft material.
Fig. 3 is a cross-sectional view showing the outer surface 10 of the contact lens 1 according to an example of the present invention. Fig. 5 is a bottom view showing a contact lens 1 according to an example of the present invention.
In some examples, as shown in fig. 1, the outer surface 10 of the contact lens 1 may be convex. Additionally, in some examples, as shown in fig. 3, the outer surface 10 may include an optical surface 11 and a perimeter surface 12. As shown in fig. 5, the peripheral surface 12 may be formed around the optical surface 11, that is, the optical surface 11 may be located at the center of the outer surface 10. In other examples, the optical surface 11 may be used to provide optical correction.
In some examples, the curvature of the optical surface 11 may be less than the curvature of the peripheral surface 12. Thereby, it can be facilitated to form the outer surface having the first predetermined shape. For example, the outer surface 10 may be formed in a first predetermined shape as shown in FIG. 3.
In some examples, the diameter D of the optical surface 111And may be 7mm to 10 mm. For example, the diameter D of the optical surface 111May be 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm or 10 mm.
In the present invention, as shown in fig. 5, the diameter D of the optical surface 111May refer to the maximum linear distance between two points corresponding to the edges of the optical surface 11.
Fig. 4 is a cross-sectional view showing the inner surface 20 of the contact lens 1 according to an example of the present invention. Fig. 6 is a plan view showing a contact lens 1 according to an example of the present invention.
In some examples, as shown in fig. 1, the inner surface 20 of the contact lens 1 may be convex. Additionally, in some examples, as shown in fig. 4, inner surface 20 may include a base curve surface 21 and a side curve surface 22. As shown in fig. 6, the side arc surface 22 may be formed around the base arc surface 21, that is, the base arc surface 21 may be located at the center of the inner surface 20.
In some examples, base curve face 21 may correspond to optical face 11, as shown in fig. 1. For example, the center of the base curve surface 21 may correspond to the center of the optical surface 11 (see fig. 7). In other examples, base curve surface 21 may be used to provide optical correction.
In some examples, the curvature of base curve surface 21 may be less than the curvature of peripheral surface 12. Thereby, the formation of the second predetermined shape of the inner surface 20 can be facilitated. For example, the inner surface 20 may be formed in a second predetermined shape as shown in FIG. 4.
In some examples, the curvature of optical surface 11 is less than the curvature of peripheral surface 12, and the curvature of base curve surface 21 is less than the curvature of peripheral surface 12. Thereby, it is possible to contribute to the formation of the outer surface 10 of the first predetermined shape and the inner surface 20 of the second predetermined shape, so that it is possible to contribute to the formation of the contact lens 1 having a specific shape, for example, it is possible to contribute to the formation of the edge zone 1c having a supporting contact lens 1. Additionally, in some examples, the contact lens 1 may be formed into a particular shape as shown in fig. 1.
In some examples, as shown in FIG. 1, the edgewise surface 22 may have no curvature. In other words, the side arc surface 22 is formed linearly on a cross section of the contact lens 1 along the rise passing through the center of the contact lens 1.
In some examples, the curvature of base curve surface 21 may be equal to the curvature of optical surface 11. This enables the contact lens 1 to have a gradual refractive power. In other examples, the curvature of base curve surface 21 may be slightly less than the curvature of optical surface 11. This enables the contact lens 1 to have a gradual refractive power.
In some examples, as shown in FIG. 1, diameter D of base curve 212May be larger than the diameter D of the optical surface 111. This can contribute to the defocus design of the front surface of the corneal contact lens 1. Additionally, in some examples, diameter D of base curve face 212May be 7.7mm to 10.0 mm. For example, the diameter D of the base curve surface 212May be 7.7mm, 8mm, 8.3mm, 8.5mm, 8.7mm, 9mm, 9.3mm, 9.5mm, 9.7mm or 10 mm.
In the present invention, as shown in fig. 6, the diameter D of the base arc surface 212May refer to the maximum straight-line distance between two points corresponding to the edges of the base arc surface 21.
In some examples, as shown in fig. 1, the side arc surface 22 may be connected with the peripheral surface 12 and the base arc surface 21, respectively. Thereby, the inner surface 20 and the outer surface 10 can be connected to form the corneal contact lens 1. That is, the outer diameter of the peripheral face 12 may be equal to the outer diameter of the side arc face 22. In other words, the outer diameter of the peripheral surface 12 and the outer diameter of the side arc surface 22 may be equal to the diameter of the contact lens 1.
In some examples, the inner surface 20 may have quadrant specificity. In addition, in some examples, the inner surface 20 may be designed based on the morphology of the eyeball, i.e., the inner surface 20 may be designed based on the morphology of the cornea 2. This allows a better adaptation to the physiological structure of the cornea 2 and thus a better adaptation to the cornea 2. In other examples, the inner surface 20 may be designed with quadrant partitions.
In some examples, the inner surface 20 may be quadrant-segmented in design to match the morphology of different quadrants of the cornea 2. This makes it possible to better match the shape of each quadrant of the cornea 2, that is, to better contact and adhere to each quadrant of the cornea 2, and thus helps to uniformly disperse the pressure applied to the cornea 2 by the contact lens 1, thereby improving the safety and comfort of the contact lens 1.
In some examples, the inner surface 20 may be divided into quadrants for a quadrant partition design. In addition, in some examples, the inner surface 20 may be divided into 2 quadrants for quadrant-division design, i.e., the base arc surface 21 may be divided into 2 quadrants for quadrant-division design, and the side arc surface 22 may be divided into 2 quadrants for quadrant-division design.
In some examples, the inner surface 20 may be quadrant-divided into a first quadrant and a second quadrant for quadrant-divided designs. That is, the base arc surface 21 may be divided into a first quadrant and a second quadrant for quadrant division design, and the edge arc surface 22 may be divided into a first quadrant and a second quadrant for quadrant division design.
In some examples, a first quadrant of the inner surface 20 may match the distal nasal side of the cornea 2 and a second quadrant may match the proximal nasal side of the cornea 2. That is, the inner surface 20 of the first quadrant may be designed based on the morphology of the distal nasal side of the cornea 2, and the inner surface 20 of the second quadrant may be designed based on the morphology of the proximal nasal side of the cornea 2. The far nasal side may be a side of the cornea 2 close to the temple, and the near nasal side may be a side of the cornea 2 close to the nose (far from the temple).
Specifically, a first quadrant of the base curve surface 21 and a first quadrant of the side curve surface 22 may match the distal nasal side of the cornea 2, and a second quadrant of the base curve surface 21 and a second quadrant of the side curve surface 22 may match the proximal nasal side of the cornea 2. In other words, the first quadrant of the base curve surface 21 and the first quadrant of the side curve surface 22 may be designed based on the morphology of the cornea 2 on the far nasal side, and the second quadrant of the base curve surface 21 and the second quadrant of the side curve surface 22 may be designed based on the morphology of the cornea 2 on the near nasal side.
In some examples, a first quadrant of inner surface 20 may match the upper lid side of cornea 2 and a second quadrant may match the lower lid side of cornea 2. The far nasal side may be a side of the cornea 2 near the upper eyelid, and the near nasal side may be a side of the cornea 2 near the lower eyelid (far from the upper eyelid).
In some examples, the inner surface 20 may be divided into 4 quadrants for a quadrant partition design. That is, the base arc surface 21 may be divided into 4 quadrants for quadrant division design, and the edge arc surface 22 may be divided into 4 quadrants for quadrant division design. Therefore, the shape of the cornea 2 can be better matched with that of the cornea 2 in the 4 quadrants, namely, the cornea 2 in the 4 quadrants can be better contacted and attached, so that the pressure of the cornea 2 caused by the corneal contact lens 1 can be uniformly dispersed, and the safety and the comfort of the corneal contact lens 1 can be improved.
In some examples, the inner surface 20 may be quadrant segmented into a first quadrant, a second quadrant, a third quadrant, and a fourth quadrant for a quadrant segmented design. That is, the base arc surface 21 may be divided into a first quadrant, a second quadrant, a third quadrant, and a fourth quadrant for quadrant division design, and the edge arc surface 22 may be divided into a first quadrant, a second quadrant, a third quadrant, and a fourth quadrant for quadrant division design.
In some examples, a first quadrant of inner surface 20 may match the superior side of cornea 2, a second quadrant may match the nasal side of cornea 2, a third quadrant may match the inferior side of cornea 2, and a fourth quadrant may match the temporal side of cornea 2. Wherein, the superior side can be a side of the cornea 2 near the superior rectus muscle, the inferior side can be a side of the cornea 2 near the inferior rectus muscle (away from the superior rectus muscle), the nasal side can be a side of the cornea 2 near the medial rectus muscle, and the temporal side can be a side of the cornea 2 near the lateral rectus muscle (away from the medial rectus muscle).
In some examples, a first quadrant of the base curve 21 and a first quadrant of the side curve 22 may match the superior side of the cornea 2, a second quadrant of the base curve 21 and a second quadrant of the side curve 22 may match the nasal side of the cornea 2, a third quadrant of the base curve 21 and a third quadrant of the side curve 22 may match the inferior side of the cornea 2, and a fourth quadrant of the base curve 21 and a fourth quadrant of the side curve 22 may match the temporal side of the cornea 2.
Specifically, the first quadrant of the base arc surface 21 and the first quadrant of the side arc surface 22 may be designed based on the morphology of the cornea 2 on the upper side, the second quadrant of the base arc surface 21 and the second quadrant of the side arc surface 22 may be designed based on the morphology of the cornea 2 on the nasal side, the third quadrant of the base arc surface 21 and the third quadrant of the side arc surface 22 may be designed based on the morphology of the cornea 2 on the lower side, and the fourth quadrant of the base arc surface 21 and the fourth quadrant of the side arc surface 22 may be designed based on the morphology of the cornea 2 on the temporal side.
In some examples, a first quadrant of inner surface 20 may match the superior nasal side of cornea 2, a second quadrant may match the inferior nasal side of cornea 2, a third quadrant may match the inferior temporal side of cornea 2, and a fourth quadrant may match the superior temporal side of cornea 2. Wherein, the nose upside can be in cornea 2 near the one side of rectus superior muscle and rectus intermedius muscle, the nose downside can be in cornea 2 near the one side of rectus intermedius muscle and rectus inframuscle, the temporal upside can be in cornea 2 near the one side of rectus externus muscle and rectus intermedius muscle, the temporal downside can be in cornea 2 near the one side of rectus externus muscle and rectus inframuscle.
In some examples, a first quadrant of the base curve 21 and a first quadrant of the side curve 22 may match the superior nasal side of the cornea 2, a second quadrant of the base curve 21 and a second quadrant of the side curve 22 may match the inferior nasal side of the cornea 2, a third quadrant of the base curve 21 and a third quadrant of the side curve 22 may match the inferior temporal side of the cornea 2, and a fourth quadrant of the base curve 21 and a fourth quadrant of the side curve 22 may match the superior temporal side of the cornea 2.
Specifically, the first quadrant of the base curve 21 and the first quadrant of the side curve 22 may be designed based on the morphology of the cornea 2 on the upper side of the nose, the second quadrant of the base curve 21 and the second quadrant of the side curve 22 may be designed based on the morphology of the cornea 2 on the lower side of the nose, the third quadrant of the base curve 21 and the third quadrant of the side curve 22 may be designed based on the morphology of the cornea 2 on the lower side of the time, and the fourth quadrant of the base curve 21 and the fourth quadrant of the side curve 22 may be designed based on the morphology of the cornea 2 on the upper side of the time.
In some examples, the inner surface 20 may also be divided into 3, 5, 6, or 8 quadrants for quadrant division design.
In some examples, the inner surface 20 may have rotational symmetry. In other words, the inner surface 20 may not have quadrant specificity.
In some examples, the base curve surface 21 may contact the cornea 2 when the contact lens 1 is worn on the eyeball. This enables the corneal contact lens 1 to be fixed to the eyeball. In other examples, the base curve surface 21 may present a contact portion with the cornea 2. In addition, the base curve surface 21 can improve the matching of the contact part and the cornea 2 through quadrant division design, thereby improving the comfort of the corneal contact lens 1.
In some examples, base curve 21 may be spaced from cornea 2, i.e., base curve 21 may form a tear space with cornea 2. In addition, in some examples, the thickness of the gap between the base curve surface 21 and the cornea 2 does not exceed 20 μm. This can reduce both loss to the cornea 2 and visual disturbance. For example, the thickness of the gap between the basal arc surface 21 and the cornea 2 may be 5 μm, 8 μm, 10 μm, 12 μm, 15 μm, 18 μm, or 20 μm.
In some examples, the arcuate surface 22 may not contact the cornea 2. In some examples, the arc surface 22 may form a rake angle with the cornea 2 for tear exchange when the contact lens 1 is worn on the eyeball. In addition, the side arc surface 22 can facilitate the formation of a more uniform tilt angle for tear exchange through quadrant division design.
In some examples, the contact lens 1 may be formed as a multifocal contact lens via an anterior surface defocus design. In this case, a multifocal design on the outer surface 10 of the contact lens 1 enables the contact lens 1 to have different dioptric power in different zones.
Additionally, in some examples, the contact lens 1 may have a progressive optical power. This makes it possible to effectively improve the visual condition of the contact lens 1 and reduce the rate of progression of myopia.
In some examples, the contact lens 1 may include a central optic zone and an outer optic zone. Additionally, in some examples, the outer viewing region may be formed around the central viewing region. In other examples, the outer viewing zone may produce peripheral defocus.
In some examples, the central and outer viewing zones may be formed by mating optical surface 11 with base curve surface 21. In other examples, the diameter of the central optic zone may be selected based on the size of the pupil.
In other examples, the central viewing zone may be the distance viewing zone 1a and the outer viewing zone may be the out-of-focus viewing zone 1 b. This enables the contact lens 1 to be used for correcting myopia.
Fig. 7 is a distribution diagram showing the area of the contact lens 1 according to the example of the present invention.
In some examples, as shown in fig. 7, a contact lens 1 can have a distance vision zone 1a and a defocus vision zone 1 b. Therefore, the corneal contact lens has the function of myopic defocus, so that the myopic deepening can be controlled or slowed down, and meanwhile, the demand of vision correction can be met. Wherein a defocus region 1b can be formed around the distance vision region 1 a. In addition, the defocus visual region 1b may include an intermediate visual region and a near visual region.
In some examples, as shown in fig. 7, distance view zone 1a and through-focus view zone 1b may be formed by matching optical surface 11 with base arc surface 21. For example, a central region of the optical surface 11 may match a central region of the base curve surface 21 to form the distance vision zone 1 a. In addition, in some examples, the defocus visual region 1b may be formed by matching a portion other than the central region of the optical surface 11 with the base arc surface 21.
In some examples, the diameter of the distance vision zone 1a may be selected based on the size of the pupil. In other examples, the diameter of the distance vision zone 1a may be 3mm to 3.5 mm. This makes it possible to fit the pupil well. For example, the diameter of the distance vision zone 1a is 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm or 3.5 mm.
In some examples, the distance vision is a reduction in the pupil size, and light passes through the distance vision zone 1a and then enters the center of the retina through the pupil, thereby enabling correction of distance vision; when looking near, the pupil enlarges to the out-of-focus visual area 1b outside the distance visual area 1a, the light passing through the out-of-focus visual area 1b becomes the near vision out-of-focus light and then enters the peripheral retina through the pupil, the far vision out-of-focus of the peripheral retina is changed into the near vision out-of-focus, thereby restraining the increase of the axis of the eye and further controlling or slowing down the deepening of the near vision.
In some examples, the power of the contact lens 1 may be gradual. For example, the power of the contact lens 1 may be gradually reduced or gradually increased. In addition, in some examples, the refractive power of the contact lens 1 may gradually change from the boundary between the distance vision zone 1a and the defocus vision zone 1b to the outer edge of the defocus vision zone 1 b. This enables the peripheral defocus to be formed.
In some examples, the power of the contact lens 1 can be graded from the distance vision zone 1a to the defocus vision zone 1 b. Therefore, the corneal contact lens 1 can have the function of myopic defocus, so that the myopic deepening can be controlled or slowed down, and meanwhile, the demand of vision correction can be met.
In some examples, the absolute value of the refractive power of the contact lens 1 may gradually decrease from the distance vision zone 1a to the defocus vision zone 1 b. In addition, in some examples, the absolute value of the diopter power of the defocus visual region 1b may gradually decrease from the boundary line of the distance visual region 1a and the defocus visual region 1b to the outer edge of the defocus visual region 1 b.
In some examples, the absolute value of the power of the distance vision zone 1a may decrease gradually from the center of the distance vision zone 1a to the edge of the distance vision zone 1 a. Additionally, in some examples, the diopter of the distance vision zone 1a may be constant.
In some examples, the central viewing zone may be a near zone and the outer viewing zone may be a far zone. This enables the corneal contact lens 1 to be used for correcting hyperopia.
In some examples, as shown in fig. 7, the corneal contact lens 1 may include an edge zone 1 c. In other examples, the edge region 1c may be formed around the outer viewing region. For example, the edge region 1c may be formed around the defocus visual region 1 b. In addition, in some examples, as shown in fig. 7, the edge region 1c may be formed by matching the peripheral surface 12 with the base arc surface 21.
In some examples, the thickness of edge region 1c may gradually increase away from the central viewing region. This can help the edge region 1c to support the contact lens 1 worn on the cornea 2. For example, the thickness of edge region 1c may gradually increase as it goes away from distance vision zone 1a, in other words, the thickness between peripheral surface 12 and base arc surface 21 gradually increases as it goes closer to base arc surface 21.
In some examples, as shown in fig. 7, the contact lens 1 may further include an edge warp zone 1 d. In other examples, the edge warp region 1d may be formed around the edge region 1 c. Additionally, in some examples, as shown in fig. 7, the edge warp zone 1d may be formed by the mating of the perimeter surface 12 and the edge arc surface 22.
In some examples, the thickness of the edge warp region 1d may gradually decrease as going away from the edge region 1 c. This can contribute to the tear exchange.
According to the utility model discloses can provide one kind and match good corneal contact lens 1 with cornea 2.
While the present invention has been described in detail in connection with the drawings and the embodiments, it is to be understood that the above description is not intended to limit the present invention in any way. The present invention may be modified and varied as necessary by those skilled in the art without departing from the true spirit and scope of the invention, and all such modifications and variations are intended to be included within the scope of the invention.
Claims (10)
1. A corneal contact lens is characterized in that,
an outer surface having a convex shape, the outer surface being composed of an optical surface located at the center and a peripheral surface formed around the optical surface, the curvature of the optical surface being smaller than that of the peripheral surface; and
an inner surface having a concave shape, the inner surface being composed of a basal plane that is in contact with a cornea and provides an optical corrective action, and an edge plane formed around the basal plane, the edge plane being connected to the peripheral plane and the basal plane, respectively, the curvature of the basal plane being smaller than that of the peripheral plane, the curvature of the basal plane being larger than that of the anterior surface of the cornea, and
the inner surface is quadrant specific, and the inner surface is quadrant segmented designed to match the morphology of different quadrants of the cornea.
2. The corneal contact lens of claim 1, wherein:
the base arc surface is divided into 4 quadrants for quadrant partition design, and the side arc surface is divided into 4 quadrants for quadrant partition design.
3. The corneal contact lens of claim 1, wherein:
the corneal contact lens is matched based on the corneal curvature and the corneal astigmatism value of the cornea.
4. The corneal contact lens of claim 1, wherein:
the diameter of the basal arc surface is larger than that of the optical surface.
5. The corneal contact lens of claim 1, wherein:
the corneal contact lens is made of a hard high oxygen permeable material, and the hard high oxygen permeable material is one selected from siloxane methacrylate, fluorosilicone methacrylate, perfluoroether and fluorinated siloxane.
6. The corneal contact lens of claim 1, wherein:
when the contact lens is worn on an eyeball, a tear space is formed between the inner surface and the cornea.
7. The corneal contact lens of claim 1, wherein:
in the contact lens, the thickness between the peripheral surface and the basal arc surface gradually increases as approaching the basal arc surface.
8. The corneal contact lens of claim 1, wherein:
a multifocal contact lens is formed through an out-of-focus design of the anterior surface.
9. The corneal contact lens of claim 1 or 8, wherein:
the contact lens has a distance vision zone and a defocus vision zone.
10. The corneal contact lens of claim 1 or 8, wherein:
the contact lens has a progressive diopter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922228749.2U CN211293490U (en) | 2019-12-09 | 2019-12-09 | Corneal contact lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922228749.2U CN211293490U (en) | 2019-12-09 | 2019-12-09 | Corneal contact lens |
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| CN211293490U true CN211293490U (en) | 2020-08-18 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114545659A (en) * | 2022-03-03 | 2022-05-27 | 上海艾康特医疗科技有限公司 | Corneal contact lens and design method thereof |
| CN114545656A (en) * | 2020-11-25 | 2022-05-27 | 上海艾康特医疗科技有限公司 | Cornea shaping mirror |
| CN114563880A (en) * | 2022-03-03 | 2022-05-31 | 上海艾康特医疗科技有限公司 | Corneal contact lens and design method thereof |
-
2019
- 2019-12-09 CN CN201922228749.2U patent/CN211293490U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114545656A (en) * | 2020-11-25 | 2022-05-27 | 上海艾康特医疗科技有限公司 | Cornea shaping mirror |
| CN114545656B (en) * | 2020-11-25 | 2023-10-24 | 上海艾康特医疗科技有限公司 | Cornea shaping mirror |
| CN114545659A (en) * | 2022-03-03 | 2022-05-27 | 上海艾康特医疗科技有限公司 | Corneal contact lens and design method thereof |
| CN114563880A (en) * | 2022-03-03 | 2022-05-31 | 上海艾康特医疗科技有限公司 | Corneal contact lens and design method thereof |
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