CN211293489U - Multifocal corneal contact lens - Google Patents
Multifocal corneal contact lens Download PDFInfo
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- CN211293489U CN211293489U CN201922205000.6U CN201922205000U CN211293489U CN 211293489 U CN211293489 U CN 211293489U CN 201922205000 U CN201922205000 U CN 201922205000U CN 211293489 U CN211293489 U CN 211293489U
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Abstract
The utility model describes a multifocal corneal contact lens, it includes: an inner surface composed of a base curve surface which is in contact with the cornea and provides an optical corrective action and a side curve surface formed around the base curve surface, and having quadrant specificity; an outer surface comprised of a centrally located optical surface and a peripheral surface formed around the optical surface and matching the optical surface with the base curve surface to form a distance viewing zone and an out-of-focus viewing zone formed around the distance viewing zone, the out-of-focus viewing zone including an intermediate viewing zone and a near viewing zone, and power progression from the distance viewing zone to the out-of-focus viewing zone. According to the utility model discloses can provide a multifocal corneal contact lens that matches well with the cornea.
Description
Technical Field
The utility model particularly relates to a multifocal 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.
However, most RGPs are currently designed only spherically or for the steepest and flattest portions, and do not achieve full corneal matching, resulting in a low comfort experience for the wearer, and due to the presence of a decentral hyperopic defocus in the eye, monofocal lenses exacerbate myopia progression due to decentral hyperopic defocus. Thus, how to better match the cornea, the multifocal design requirement for myopia control is a hotspot in the current RGP field.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned conventional circumstances, it is an object of the present invention to provide a multifocal contact lens that can be well fitted to the cornea.
To this end, the present invention provides a multifocal contact lens comprising: an inner surface composed of a base curve surface that contacts the cornea and provides an optical corrective action and a side curve surface formed around the base curve surface, and the inner surface having quadrant specificity; an outer surface comprised of a centrally located optical surface and a peripheral surface formed around the optical surface and matching with the base surface forms a distance viewing zone and an out-of-focus viewing zone formed around the distance viewing zone, the out-of-focus viewing zone including an intermediate viewing zone and a near viewing zone, and power progression from the distance viewing zone to the out-of-focus viewing zone.
The utility model discloses in, multifocal corneal contact lens has surface and internal surface, and wherein the internal surface has quadrant specificity, and 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 multifocal corneal contact lens caused the cornea evenly to can improve multifocal corneal contact lens's security and comfort level. In addition, in the multifocal corneal contact lens, a distance vision area and an out-of-focus vision area are provided, and the diopter of the multifocal corneal contact lens is gradually changed from the distance vision area to the out-of-focus vision area, so that the multifocal corneal contact lens can have a myopic out-of-focus effect, the myopic progression can be controlled or slowed, and at the same time, the vision correction requirement can be met.
Additionally, in the multifocal contact lenses of the present invention, optionally, the inner surface is designed to match the topography of different quadrants of the cornea via quadrant division. Therefore, the shape of the cornea can be better matched with that of each quadrant, namely, the cornea can be better contacted and attached with the cornea of each quadrant, so that the pressure of the multifocal corneal contact lens on the cornea can be uniformly dispersed, and the safety and the comfort of the multifocal corneal contact lens can be improved.
In addition, in the multifocal contact lens of the present invention, optionally, the multifocal contact lens is fitted based on the corneal curvature and the corneal astigmatism value of the cornea. Therefore, the fitting of the multifocal contact lens with the cornea can be facilitated, and the wearing comfort and the definition of vision correction can be improved.
Further, in the multifocal contact lens of the present invention, optionally, a diameter of the base curve surface is larger than a diameter of the optical surface. Thereby, the out-of-focus design of the front surface of the multifocal contact lens can be facilitated.
Further, in the multifocal contact lens of the present invention, optionally, the side arc surfaces are connected to the peripheral surface and the base arc surface, respectively. Thereby, the inner surface and the outer surface can be connected to form a multifocal contact lens.
In addition, in the multifocal contact lens of the present invention, optionally, the multifocal 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 multifocal contact lenses can be made to have good oxygen permeability, and the wear resistance of the multifocal contact lenses can be improved and the production of multifocal contact lenses can be facilitated.
In the multifocal contact lens of the present invention, a tear space may be formed between the inner surface and the cornea when the multifocal contact lens is worn on an eyeball. Therefore, the wearing of the multifocal corneal contact lens on the cornea can be reduced, and the wearing comfort can be improved.
In addition, in the multifocal contact lens of the present invention, optionally, the curvature of the optical surface is smaller than the curvature of the peripheral surface, and the curvature of the base surface is smaller than the curvature of the peripheral surface. Thus, the formation of the outer surface of the first predetermined shape and the inner surface of the second predetermined shape can be facilitated, thereby facilitating the formation of a multifocal contact lens having a particular shape.
In addition, in the multifocal contact lens of the present invention, optionally, an edge zone is formed around the defocus visual zone, and the thickness of the edge zone gradually increases as the distance visual zone is away. Thereby, the edge zone supporting multifocal contact lenses can be facilitated to be worn on the cornea.
Additionally, in the multifocal contact lens of the present invention, optionally, the diameter of the distance vision zone is 3mm to 3.5 mm. This makes it possible to fit the pupil well.
According to the utility model discloses can provide a multifocal corneal contact lens that matches well with the cornea.
Drawings
Fig. 1 is a schematic diagram showing the structure of a multifocal contact lens according to an example of the present invention.
Fig. 2 is a view showing an application scenario of a multifocal contact lens according to an example of the present invention.
Figure 3 is a cross-sectional view showing the outer surface of a multifocal contact lens according to examples of the invention.
Figure 4 is a cross-sectional view showing the inner surface of a multifocal contact lens according to examples of the invention.
Figure 5 is a bottom view of a multifocal contact lens according to examples of the invention.
Figure 6 is a top view illustrating a multifocal contact lens according to examples of the invention.
Figure 7 is a zone profile diagram illustrating a multifocal contact lens according to examples of the 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 multifocal contact lens 1 according to an example of the present invention.
As shown in fig. 1, a multifocal contact lens 1 according to the present embodiments may include an inner surface 20 and an outer surface 10. Wherein the inner surface 20 may be composed of a base curve surface 21 which contacts the cornea 2 and provides an optical correction effect and a side curve surface 22 formed around the base curve surface 21, and the inner surface 20 may have quadrant specificity. In addition, the outer surface 10 may be composed of a centrally located optical surface 11 and a peripheral surface 12 formed around the optical surface 11. In some examples, the optical surface 11 may match the base arc surface 21 to form a distance viewing zone 1a and a defocus viewing zone 1b formed around the distance viewing zone 1a, wherein the defocus viewing zone 1b may include an intermediate viewing zone and a near viewing zone, and the refractive power may be gradually changed from the distance viewing zone 1a to the defocus viewing zone 1 b.
In the present embodiment, the multifocal contact lens 1 has an outer surface 10 and an inner surface 20, wherein the inner surface 20 has quadrant specificity, and thus the inner surface 20 can better match the shape of the respective quadrant cornea 2, i.e., can better contact and fit with the respective quadrant cornea 2, thereby helping to uniformly distribute the pressure of the multifocal contact lens 1 on the cornea 2, and thus improving the safety and comfort of the multifocal contact lens 1. In addition, in the multifocal contact lens 1, there are a distance vision region 1a and an defocus vision region 1b, and the diopter is gradually changed from the distance vision region 1a to the defocus vision region 1b, whereby the multifocal contact lens 1 can be given a myopic defocus effect, so that the progression of myopia can be controlled or slowed, and at the same time, the demand for vision correction can be satisfied.
Fig. 2 is a view showing an application scenario of the multifocal contact lens 1 according to an example of the present invention.
In some examples, as shown in fig. 2, when the multifocal 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 abrasion of the multifocal contact lens 1 to the cornea 2, 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 multifocal contact lens 1 may be fitted based on the corneal 2 curvature and the corneal 2 astigmatism values of the cornea 2. Thus, the fitting of the multifocal contact lens 1 to the cornea 2 can be facilitated, and the wearing comfort and the clarity 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 multifocal contact lens 1 may be constructed of a rigid material. In other examples, the multifocal contact lens 1 may be constructed of a hard, highly oxygen permeable material. In this case, it is possible to provide the multifocal contact lens 1 with good oxygen permeability, to improve the abrasion resistance of the multifocal contact lens 1, and to facilitate the production of the multifocal 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 diameter of the multifocal contact lens 1 may be 9.6mm to 12.0mm, for example, the diameter of the multifocal contact lens 1 may be 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 multifocal contact lens 1 may be 0.10mm to 1.00mm thick. Therefore, the deformation of the multifocal contact lens 1 can be relieved, and the weight of the multifocal contact lens 1 can be avoided. For example, the multifocal 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 multifocal contact lens 1 can be from 100 to 200. Therefore, the tear liquid has better oxygen permeability, so that the tear liquid can provide oxygen for the cornea 2, and further, the health of the cornea 2 is favorably maintained. For example, the DK value of the multifocal contact lens 1 can be 100, 125, or 141.
In some examples, the multifocal contact lens 1 may be a hybrid contact lens that is a combination of both hard and soft lenses. Additionally, in some examples, the central region of the multifocal contact lens 1 may be constructed of a hard material and the peripheral region may be constructed of a soft material.
In some examples, the multifocal contact lens 1 may be formed via an out-of-focus design of the anterior surface. In this case, the multifocal design is on the outer surface 10 of the multifocal contact lens 1, enabling the multifocal contact lens 1 to have different powers in different zones.
Additionally, in some examples, the multifocal contact lens 1 may have a progressive refractive power. Thus, contact lenses can more effectively improve vision and reduce the rate of myopia progression.
Figure 3 is a cross-sectional view showing the outer surface 10 of a multifocal contact lens 1 according to an example of the invention. Fig. 5 is a bottom view of a multifocal contact lens 1 according to an example of the invention.
In some examples, as shown in figure 1, the outer surface 10 of the multifocal 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 10 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.
In some examples, the curvature of the center of the optical surface 11 may be greater than the curvature of the periphery of the optical surface 11. Thus, the formation of a negative lens for correcting myopia can be facilitated. In other examples, the curvature of optical surface 11 may decrease from the center of optical surface 11 to the edge of optical surface 11.
In some examples, the curvature of the center of the optical surface 11 may be less than the curvature of the periphery of the optical surface 11. Thus, it is possible to facilitate the formation of a positive lens for correcting hyperopia. In other examples, the curvature of optical surface 11 may gradually decrease from the center of optical surface 11 to the edge of optical surface 11.
Figure 4 is a cross-sectional view showing the inner surface 20 of a multifocal contact lens 1 according to examples of the invention. Figure 6 is a top view of a multifocal contact lens 1 according to an example of the invention.
In some examples, as shown in figure 1, the inner surface 20 of the multifocal 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 the center of the base arc surface 21 may be smaller than the curvature of the periphery of the base arc surface 21. Thereby, it can contribute to the shape matching with the cornea 2. In other examples, the curvature of base arc surface 21 may gradually decrease from the center of base arc surface 21 to the edge of base arc surface 21.
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, the formation of the first predetermined shaped outer surface 10 and the second predetermined shaped inner surface 20 can be facilitated, thereby facilitating the formation of a multifocal contact lens 1 having a particular shape, such as the edge zone 1c supporting the multifocal contact lens 1. Additionally, in some examples, the multifocal contact lens 1 may be formed in 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 multifocal contact lens 1 along a rise passing through the center of the multifocal 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 multifocal contact lens 1 to have a progressive 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 multifocal contact lens 1 to have a progressive 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. Thereby, the front surface defocus design of the multifocal contact lens 1 can be facilitated. 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 a multifocal 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 multifocal 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 fit each quadrant of the cornea 2, and thus, it is possible to contribute to uniformly dispersing the pressure of the multifocal contact lens 1 on the cornea 2, and to improve the safety and comfort of the multifocal 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 of 4 quadrants, namely, the cornea 2 of 4 quadrants can be better contacted and attached, so that the pressure of the multifocal corneal contact lens 1 on the cornea 2 can be uniformly dispersed, and the safety and the comfort of the multifocal 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 be in contact with the cornea 2 when the multifocal contact lens 1 is worn on the eye. This enables the multifocal 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, so that the comfort of the multifocal corneal contact lens 1 can be improved.
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 μ ultrasound. 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 fluid exchange when the multifocal contact lens 1 is worn on the eye. 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 multifocal 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. Thereby, the multifocal contact lens 1 can be used to correct myopia.
Fig. 7 is a zone profile diagram illustrating a multifocal contact lens 1 according to an example of the invention.
In some examples, as shown in fig. 7, a multifocal contact lens 1 can include 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 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 multifocal contact lens 1 may be progressive. For example, the multifocal contact lens 1 may have a gradually decreasing or gradually increasing power. Additionally, in some examples, the refractive power of the multifocal contact lens 1 can be graded from the boundary of 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 multifocal contact lens 1 can be graded from distance vision zone 1a to through-focus vision zone 1 b. Thus, the multifocal contact lens 1 can be made to have a myopic defocus effect, so that the progression of myopia can be controlled or slowed, and at the same time, the demand for vision correction can be satisfied.
In some examples, the absolute value of the refractive power of the multifocal contact lens 1 can 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. Thereby, the multifocal contact lens 1 can be used to correct hyperopia.
In some examples, as shown in fig. 7, the multifocal 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 multifocal contact lens 1 worn on the cornea 2. For example, the thickness of the edge region 1c may gradually increase as it goes away from the distance vision region 1 a.
In some examples, as shown in fig. 7, the multifocal contact lens 1 may also 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.
The present invention can provide a multifocal contact lens 1 that is well-matched to the 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 multifocal contact lens, characterized in that,
the method comprises the following steps:
an inner surface composed of a base curve surface that contacts the cornea and provides an optical corrective action and a side curve surface formed around the base curve surface, and the inner surface having quadrant specificity;
an outer surface composed of a centrally located optical surface and a peripheral surface formed around the optical surface, and
the optical surface and the base arc surface are matched to form a distance visual area and an out-of-focus visual area formed around the distance visual area, the out-of-focus visual area comprises an intermediate visual area and a near visual area, and diopter gradually changes from the distance visual area to the out-of-focus visual area.
2. A multifocal contact lens as defined in claim 1, wherein:
the inner surface is quadrant-segmented designed to match the morphology of different quadrants of the cornea.
3. A multifocal contact lens as defined in claim 1, wherein:
the multifocal contact lenses are fitted based on the corneal curvature and corneal astigmatism values of the cornea.
4. A multifocal contact lens as defined in claim 1, wherein:
the diameter of the basal arc surface is larger than that of the optical surface.
5. A multifocal contact lens as claimed in claim 1 or 4, characterized in that:
the edge arc surface is connected with the peripheral surface and the base arc surface respectively.
6. A multifocal contact lens as defined in claim 1, wherein:
the multifocal 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.
7. A multifocal contact lens as defined in claim 1, wherein:
when the multifocal contact lens is worn on an eyeball, a tear space is formed between the inner surface and the cornea.
8. A multifocal contact lens as claimed in claim 1 or 4, characterized in that:
the curvature of the optical surface is greater than or less than that of the peripheral surface, and the curvature of the basal arc surface is less than that of the peripheral surface.
9. A multifocal contact lens as defined in claim 1, wherein:
and an edge region formed around the out-of-focus viewing region, the edge region having a thickness gradually increasing as it goes away from the distance viewing region.
10. A multifocal contact lens as defined in claim 1, wherein:
the diameter of the distance vision zone is 3mm to 3.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922205000.6U CN211293489U (en) | 2019-12-09 | 2019-12-09 | Multifocal corneal contact lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922205000.6U CN211293489U (en) | 2019-12-09 | 2019-12-09 | Multifocal corneal contact lens |
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| Publication Number | Publication Date |
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| CN211293489U true CN211293489U (en) | 2020-08-18 |
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| CN201922205000.6U Active CN211293489U (en) | 2019-12-09 | 2019-12-09 | Multifocal corneal contact lens |
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| CN (1) | CN211293489U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN114815307A (en) * | 2022-05-31 | 2022-07-29 | 凯乐康医药科技有限公司 | Anti-fatigue contact lens and balancing method processing technology thereof |
| TWI820551B (en) * | 2021-12-27 | 2023-11-01 | 晶碩光學股份有限公司 | Optical lens |
-
2019
- 2019-12-09 CN CN201922205000.6U patent/CN211293489U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI820551B (en) * | 2021-12-27 | 2023-11-01 | 晶碩光學股份有限公司 | Optical lens |
| 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 |
| CN114815307A (en) * | 2022-05-31 | 2022-07-29 | 凯乐康医药科技有限公司 | Anti-fatigue contact lens and balancing method processing technology thereof |
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Effective date of registration: 20221102 Address after: No. 104, Tangqian Village, Beiyan Town, Changle County, Weifang, Shandong 261000 Patentee after: Zhang Tiangui Address before: Room 504, building 2, No.36, Doukou Road, Guangdong Macao cooperative traditional Chinese medicine science and Technology Industrial Park, Hengqin New District, Zhuhai City, Guangdong Province, 519031 Patentee before: Zhuhai Weishi aikangte Pharmaceutical Technology Co.,Ltd. Patentee before: Shanghai aikangte Medical Technology Co.,Ltd. Patentee before: Zhuhai Xigu Medical Technology Co.,Ltd. |