TWM587281U - Hard corneal contact lens - Google Patents

Abstract

A rigid contact lens mainly includes a front surface and a rear surface. The front surface includes a central area of the front surface located at the center of the front surface and a peripheral area of the front surface located outside the central area of the front surface. The shortest arc length of a point is 1.1mm. The central area of the front surface may include at least one ellipsoid or ellipsoidal arc segment, or it may include at least two spheres and spherical arc segments. The surface basis is based on an elliptical sphere or multiple spheres. The characteristics of the lateral-center hyperopia defocus of the human eye, the curvature radius of each point on the curved surface is constantly changing, the curvature radius of the front surface of the lens is continuously increased, and the diopter is increased to reduce the phenomenon of lateral-center hyperopia defocus to solve the existing rigid cornea Contact lenses do not reduce the problem of side-center hyperopia defocus.

Description

Rigid contact lens

This creation is about a contact lens, especially a rigid contact lens that can effectively solve the problem of lateral hyperopia and defocus.

Rigid contact lenses are commonly used lenses for correcting vision in patients with myopia. The optical area (4mm-8mm area in the center of the lens) of the front surface of the existing rigid contact lenses is spherical and has the same radius of curvature, which is a single focus lens. From the perspective of optics, the human eye has a paracentric hyperopia defocus phenomenon, that is, the same object is imaged on the retina. The image point in the center of the object falls in the central region of the retina, but the image points in the peripheral part of the object fall behind the retina. The so-called side-center hyperopia defocus. This phenomenon has also proven to be an important reason for the development of myopia. Reducing this phenomenon can slow the development of myopia. Consumers with existing unifocal lenses may develop myopia due to side-center hyperopia defocus.

From the above, it is known that there are still many problems with rigid contact lenses. Therefore, in view of the above problems, the inventor of this case was eager to improve and innovate. After years of painstaking research, he finally successfully developed this rigid cornea. Contact lens.

This creation provides a rigid contact lens to solve the technical problem that the existing rigid contact lens can develop myopia due to the paracentric hyperopia and defocus.

In order to solve the above technical problems, this creation is to provide a rigid contact lens, which mainly includes a front surface and a rear surface of the lens, and the front surface includes a central area of the front surface located at the center of the front surface and a periphery of the front surface located at the periphery of the central area of the front surface. Area, the shortest arc length from the center of the front surface to any point on the edge of the central area is 1.1 mm, and the central area of the front surface may include at least one ellipsoid or an arc segment of an ellipsoid.

The central area of the front surface may further include at least two spherical surfaces or arc segments of the spherical surface.

Wherein, the ratio of the long axis to the short axis of the above-mentioned elliptical spherical surface or elliptical arc segment is greater than 1.0, and the long axis value is greater than 1.0 mm and less than 100 mm. The radius of the spherical surface or spherical arc segment is greater than 1mm and less than 100mm.

Wherein, the peripheral area of the front surface includes at least one ellipsoid or an arc segment of the ellipsoid.

The peripheral area of the front surface includes at least two spherical surfaces or arc segments of the spherical surface.

Wherein, the rear surface is a combination of spherical or / and aspheric or / and multi-segment spherical or / and multi-arc aspheric or / and multi-zone spherical or / and multi-zone aspheric.

The rear surface is composed of one or more spherical surfaces or spherical arc segments.

The rear surface includes at least one ellipsoid or an arc segment of the ellipsoid.

Among them, the rear surface is divided into two regions from the center of the rear surface to the periphery of the rear surface in order from the center to the edge. The central area of the rear surface is a spherical surface or an elliptical spherical surface. The arc length is in the range of 1.0mm-15.0mm, and the peripheral area of the rear surface is composed of a spherical arc segment or an elliptical spherical arc segment.

The rear surface is divided into the central area of the rear surface, The peripheral area of the rear surface and the arc area of the rear surface. The central area of the rear surface is a spherical or ellipsoidal surface. The shortest arc length from the center of the rear surface to any point on the edge of the central area of the rear surface ranges from 1.0mm to 15.0mm. It consists of a spherical arc segment or an elliptical spherical arc segment. The shortest arc length from the center of the rear surface to any point on the peripheral edge of the rear surface is in the range of 1.0mm-20.0mm. The area of the rear arc is composed of a spherical arc segment or an elliptical spherical surface. The shortest arc length is composed of arc segments, and the shortest arc length from the center of the rear surface to any point on the edge region of the rear surface is in the range of 1.0mm-20.0mm.

The rear surface is divided into a rear surface central region, a rear surface sub-central region, a rear surface peripheral region, and a rear surface edge region in order from the center to the edge of the rear surface. The central region of the rear surface is a spherical surface or an elliptical spherical surface. The shortest arc length from the center to any point on the center of the rear surface is in the range of 1.0mm-15.0mm. The sub-central area of the rear surface is composed of a spherical arc segment or an elliptical spherical arc segment. The center of the rear surface is the edge of the sub-central area of the rear surface. The shortest arc length at any point is in the range of 1.0mm-20.0mm. The peripheral area of the rear surface is composed of a spherical arc segment or an elliptical spherical arc segment. The shortest arc length from the center of the rear surface to any point on the edge of the peripheral area of the rear surface. In the range of 1.0mm-20.0mm; the rear surface edge arc region is composed of a spherical arc segment or an elliptical spherical arc segment, and the shortest arc length from the center of the rear surface to any point on the edge of the rear surface arc region is 1.0mm-20.0 mm range.

After the rigid contact lens provided by this creation adopts the above technical solution, since the shortest arc length from the center of the front surface to any point on the edge of the front surface central area is 1.1mm, the center area of the front surface includes at least one ellipsoid and arc segment Or two spheres and arcs. The elliptical spherical surface or the arc segment of the spherical surface is based on the characteristics of the far-sighted defocus of the lateral center of the human eye. The curvature radius of each point on the curved surface continuously changes. The curvature radius of the front surface of the lens is continuously increased, and the diopter is increased to reduce The phenomenon of far-sighted defocus in the collateral center solves the technical problem that the existing rigid contact lens does not reduce the far-sighted defocus in the lateral center.

1‧‧‧ central area of front surface

2‧‧‧ front peripheral area

3‧‧‧ central area of rear surface

4‧‧‧ area around the rear surface

5‧‧‧ rear surface edge arc area

6‧‧‧ rear surface sub-central area

FIG. 1 is a schematic structural diagram of a rigid contact lens of the present invention; FIG. 2 is a schematic structural diagram of another embodiment of the rigid contact lens of the present invention; and FIG. 3 is a schematic structural diagram of another embodiment of the rigid contact lens of the present invention.

The following will describe specific embodiments to illustrate the implementation of this creation, but it is not intended to limit the scope of protection of this creation.

As shown in Figure 1, the rigid contact lens provided by this creation mainly includes an anterior surface and an posterior surface. The anterior surface includes an anterior surface central region 1 located at the center of the anterior surface and an anterior surface peripheral region 2 located around the anterior surface central region 1. The shortest arc length from the center of the front surface to any point on the edge of the front surface central area 1 is 1.1mm. The front surface central area 1 contains at least one ellipsoid or ellipsoidal arc segment. For example, the front surface central area 1 is all ellipsoidal or The arc segment of the elliptical sphere can also be an arc segment of which the middle part of the front surface central region 1 is a sphere or a spherical surface and the middle part of the central region 1 of the front surface is an elliptical sphere or an elliptical spherical segment. It can also consist of multiple different ellipses Spherical or elliptical spherical segments, or composed of multiple different spherical or spherical arc segments, or a mixture of multiple different elliptical or spherical spherical segments with multiple different spherical or spherical arc segments , And the front surface peripheral region 2 includes at least one elliptical or elliptical spherical segment, which can be an elliptical or elliptical spherical segment, or Be a plurality of oval or ellipsoidal Spherical arc segments can also be a mixture of elliptical spherical or elliptical spherical segments and spherical or spherical arc segments. The elliptical or elliptical spherical segments can be one or more. Spherical or spherical There may be one or more arc segments, where the ratio of the long axis to the short axis of the elliptical sphere or elliptical arc segment is greater than 1.0, and the long axis value is greater than 1.0 mm and less than 100 mm. The radius of the spherical surface or spherical arc segment is greater than 1mm and less than 100mm.

The rear surface can be spherical, aspheric, multi-arc spherical, multi-arc aspheric, multi-region spherical, multi-region aspheric, or a combination thereof. For example, the rear surface is composed of one or more spherical or spherical arc segments, and the rear surface is also Is an arc segment containing one or more ellipsoids or ellipsoids.

The rear surface is divided from the center to the edge of the rear surface into three regions: the rear surface central region 3 and the rear surface peripheral region 4. The rear surface central region 3 is a spherical surface or an elliptical spherical surface. The shortest arc length at any point is in the range of 1.0mm-15.0mm, and the peripheral area 4 of the rear surface is composed of a spherical arc segment or an elliptical spherical arc segment.

The rear surface can also be divided into the rear surface central region 3, the rear surface peripheral region 4 and the rear surface edge region 5 in order from the center to the edge. The rear surface central region 3 is a spherical surface or an elliptical spherical surface. The shortest arc length from the center of the center to any point on the edge of the rear surface 3 is in the range of 1.0mm-15.0mm. The peripheral area of the rear surface 4 is composed of a spherical arc segment or an elliptical spherical arc segment. The center of the rear surface is the peripheral area of the rear surface. The shortest arc length at any point on the 4 edge is in the range of 1.0mm-20.0mm. The rear surface edge arc area 5 is composed of a spherical arc segment or an elliptical spherical arc segment. The center of the rear surface is at any point on the edge of the rear surface edge arc area 5. The shortest arc length is in the range of 1.0mm-20.0mm.

The rear surface can also be divided into the rear surface central region 3, the rear surface sub-central region 6, the rear surface peripheral region 4, and the rear surface in order from the center to the edge of the rear surface. The surface arc area 5 and the rear center area 3 are spherical or ellipsoidal. The shortest arc length from the center of the rear surface to any point on the edge of the rear surface area 3 is in the range of 1.0mm-15.0mm. A spherical arc segment or an elliptical spherical arc segment. The shortest arc length from the center of the rear surface to any point on the edge of the rear surface sub-central area 6 is in the range of 1.0mm-20.0mm. The peripheral area 4 of the rear surface is composed of a spherical arc segment or ellipse. Spherical arc segment, the shortest arc length from the center of the rear surface to any point on the peripheral edge of the rear surface 4 is in the range of 1.0mm-20.0mm; the rear surface edge arc region 5 is composed of a spherical arc segment or an elliptical spherical arc segment. The shortest arc length from the center of the surface to any point on the back surface edge region 5 is in the range of 1.0mm-20.0mm.

From the above, in the rigid horny contact lens provided by this creation, since the shortest arc length from the center of the front surface to any point on the edge of the front surface center area 1 is 1.1 mm, the front surface center area 1 may include at least one elliptical spherical surface. Or an elliptical spherical arc segment, which may also include at least two spherical surfaces and spherical arc segments. A curved surface composed of an elliptical sphere or a multi-spherical surface is based on the characteristics of far-sighted defocus of the side center of the human eye. The curvature radius of each point on the surface is constantly changing. The curvature radius of the front surface of the lens is continuously increased, and the diopter is increased to reduce the side-center hyperopia. The focal phenomenon solves the technical problem that the existing rigid contact lens does not reduce the lateral-center hyperopia defocus.

The above detailed description is a specific description of one of the feasible embodiments of this creation, but this embodiment is not intended to limit the scope of the patent for this creation. Any equivalent implementation or change that does not depart from the spirit of this creation technique should be included in Within the scope of the patent in this case.

Claims (14)

A rigid contact lens comprising: a front surface, the front surface including a front surface central region located at the center of the front surface and a front surface peripheral region located outside the front surface central region; the front surface center to the front surface center The shortest arc length at any point on the edge of the area is 1.1 mm, and the central area of the front surface includes at least one elliptical or elliptical arc segment; a rear surface. The rigid contact lens according to claim 1, wherein the central region of the front surface further includes at least two spherical surfaces or arc segments. The rigid contact lens according to claim 1, wherein the ratio of the long axis to the short axis of the elliptical spherical surface or elliptical arc segment is greater than 1.0, and the long axis value is greater than 1.0 mm and less than 100.0 mm. The rigid contact lens according to claim 2, wherein the radius of the spherical surface or the spherical arc segment is greater than 1.0 mm and less than 100.0 mm. The rigid contact lens according to claim 1, 2, 3 or 4, wherein the peripheral area of the front surface includes at least one ellipsoid or an arc segment of the ellipsoid. The rigid contact lens according to claim 1, 2, 3, or 4, wherein the peripheral area of the front surface includes at least two spherical surfaces or spherical segments. The rigid contact lens according to claim 5, wherein the ratio of the long axis to the short axis of the elliptical spherical surface or elliptical arc segment is greater than 1.0, and the long axis value is greater than 1.0 mm and less than 100.0 mm. The rigid contact lens according to claim 6, wherein the radius of the spherical surface or the spherical arc segment is greater than 1.0 mm and less than 100.0 mm. The rigid contact lens according to claim 1, 2, 3 or 4, wherein the rear surface is spherical or / and aspheric or / and multi-arc spherical or / and multi-arc aspheric or / and multi-region spherical Or / and a combination of multi-zone aspheric surfaces. The rigid contact lens according to claim 1, 2, 3 or 4, wherein the rear surface is composed of one or more spherical surfaces or spherical arc segments. The rigid contact lens according to claim 1, 2, 3 or 4, wherein the rear surface includes at least one ellipsoid or an arc segment of the ellipsoid. The rigid contact lens according to claim 1, 2, 3, or 4, wherein the rear surface is divided into two regions of the rear surface central region and the rear surface peripheral region in order from the center to the edge, and the central region of the rear surface is spherical Or the elliptical spherical surface, the shortest arc length from the center of the rear surface to any point on the edge of the central area of the rear surface ranges from 1.0mm to 15.0mm, and the peripheral area of the rear surface is composed of a spherical arc segment or an elliptical spherical segment. The rigid contact lens according to claim 1, 2, 3, or 4, wherein the rear surface is divided into a rear surface central region, a rear surface peripheral region, and a rear surface side arc region in order from the center to the edge, and the rear surface center The area is spherical or elliptical. The shortest arc length from the center of the rear surface to any point on the edge of the central area of the rear surface ranges from 1.0mm to 15.0mm. The peripheral area of the rear surface is composed of a spherical arc segment or an elliptical spherical arc segment. The shortest arc length from the center of the rear surface to any point on the edge of the peripheral area of the rear surface is in the range of 1.0mm-20.0mm. The edge area of the rear surface is composed of a spherical arc segment or an elliptical spherical arc segment. The shortest arc length from the center to any point on the back surface edge region is in the range of 1.0mm-20.0mm. The rigid contact lens according to claim 1, 2, 3 or 4, wherein the rear surface is divided into a rear surface central region, a rear surface sub-central region, and a rear surface peripheral region from the center to the edge of the rear surface in order. And the rear surface edge arc area, the central area of the rear surface is a spherical surface or an elliptical spherical surface, and the shortest arc length from the center of the rear surface to any point on the edge of the central area is in the range of 1.0mm-15.0mm. Spherical arc segment or elliptical spherical segment. The shortest arc length from the center of the rear surface to any point on the edge of the sub-central area of the rear surface is in the range of 1.0mm-20.0mm. The peripheral area of the rear surface is composed of a spherical arc segment or an elliptical spherical surface. The shortest arc length from the center of the rear surface to any point on the edge of the peripheral area of the rear surface is in the range of 1.0mm-20.0mm; the edge area of the rear surface is composed of a spherical arc segment or an elliptical spherical arc segment. The shortest arc length from the center of the rear surface to any point on the edge region of the rear surface is in the range of 1.0mm-20.0mm.