CN108363219A - A kind of hard corneal contact lens - Google Patents

Abstract

The present invention relates to a kind of hard corneal contact lens, including front surface and rear surface, front surface includes the front surface middle section positioned at front surface center and the neighboring area on the outside of front surface middle section.The a length of 1.1mm of the shortest arc of any point on front surface center to middle section edge, front surface middle section can include at least an ellipsoidal surface or ellipsoidal surface segmental arc, can also be including at least two or more spherical surfaces and spherical surface segmental arc.Feature of the curved surface of ellipsoidal surface or more spherical surfaces composition according to the other central distance vision defocus of human eye, each point radius of curvature constantly changes on curved surface, continue to increase the radius of curvature of lens front surface, increase diopter, the phenomenon that reducing other central distance vision defocus, to solve the technical issues of existing hard corneal contact lens do not reduce other central distance vision defocus.

Description

a rigid contact lens

technical field

The invention relates to a rigid corneal contact lens.

Background technique

Rigid contact lenses are commonly used lenses for vision correction of myopia patients. The optical area of the front surface of the existing rigid contact lenses (the central 4mm-8mm area of the lens) is spherical, with the same radius of curvature, that is, a single focus lens. From the perspective of optometry, the human eye has paracentric hyperopic defocusing, that is, when the same object is imaged on the retina, the image point in the center of the object falls on the central area of the retina, but the image points in the peripheral part of the object fall behind the retina. The so-called paracentral hyperopic defocus. This phenomenon has also been shown to be an important reason for the development of myopia. Reducing this phenomenon can slow the progression of myopia. Users of existing single-focal lenses will develop myopia due to hyperopic defocusing near the center. For example, the invention patent No. 2017101592791 applied by the inventor can only form a very large defocusing ring around the periphery, and it is difficult to form a large defocusing ring in the center of the optical instrument. Form an optical circle that reduces paracentral hyperopic defocus, so that there will still be a large paracentral hyperopic defocus in the center of the retina, which will still lead to the development of myopia.

Contents of the invention

The invention provides a rigid contact lens to solve the technical problem that users of existing rigid contact lenses may develop myopia due to paracentric hyperopic defocusing.

In order to solve the above technical problems, the technical scheme that the present invention takes is:

A rigid contact lens, comprising a front surface and a back surface, the front surface includes a front surface central area located at the center of the front surface and a peripheral area located outside the front surface central area, characterized in that: the front surface center The shortest arc length to any point on the edge of the central area is 1.1 mm, and the central area of the front surface contains at least one ellipsoid or an arc of an ellipsoid.

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

The ratio of the major axis to the minor axis of the ellipsoid or ellipse arc is greater than 1.0, and the major axis is greater than 1.0mm and less than 100.0mm.

The radius of the spherical surface or spherical arc section is greater than 1.0mm and less than 100.0mm.

The peripheral area of the front surface at least includes an ellipsoid or an arc of an ellipsoid.

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

The ratio of the major axis to the minor axis of the ellipsoid or ellipse arc is greater than 1.0, and the major axis is greater than 1.0mm and less than 100.0mm.

The radius of the spherical surface or spherical arc section is greater than 1.0mm and less than 100.0mm.

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-region aspheric.

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

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

The rear surface is divided into two regions, the central region of the rear surface and the peripheral region of the rear surface, from the center to the edge. The central region of the rear surface is a spherical or ellipsoidal surface. The shortest 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 ellipsoidal arc segment.

The rear surface is divided into a rear surface central area, a rear surface peripheral area, and a rear surface edge arc area from the center to the edge in turn. The rear surface central area is a spherical or ellipsoidal surface, and the center of the rear surface reaches the rear surface. The shortest arc length of any point on the edge of the central area of the surface is in the range of 1.0mm-15.0mm, the peripheral area of the rear surface is composed of a spherical arc segment or an ellipsoidal arc segment, and the center of the rear surface reaches the peripheral area of the rear surface The shortest arc length at any point on the edge is in the range of 1.0mm-20.0mm, and the arc area of the back surface is composed of a spherical arc segment or an ellipsoid arc segment, and the center of the back surface reaches the edge of the arc area of the back surface The shortest arc length at any point is in the range of 1.0mm-20.0mm.

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

After adopting the above technical solution, since the shortest arc length from the center of the front surface to any point on the edge of the central area is 1.1mm, the central area of the front surface contains at least one ellipsoid and arc or two spheres and arc. The arc of the ellipsoid or spherical surface is based on the characteristics of the paracentral hyperopic defocus of the human eye. The curvature radius of each point on the curved surface is constantly changing, and the curvature radius of the front surface of the lens is continuously increased to increase the diopter to reduce the paracentral hyperopic defocus. phenomenon, which solves the technical problem that the existing rigid contact lens does not reduce the paracentric hyperopic defocus.

Description of drawings

Fig. 1 is a schematic structural diagram of a specific embodiment 1 of the present invention.

Fig. 2 is a schematic diagram of another structure with a different rear surface in Embodiment 1 of the present invention.

Fig. 3 is a schematic diagram of a third structure with a different rear surface in Embodiment 1 of the present invention.

In the figure, 1 is the central area of the front surface, 2 is the peripheral area of the front surface, 3 is the central area of the rear surface, 4 is the sub-central area of the rear surface, 5 is the peripheral area of the rear surface, and 6 is the edge arc area of the peripheral area of the rear surface.

Detailed ways

Specific embodiment one

As shown in Figure 1, a kind of rigid contact lens, comprises front surface and back surface, and front surface comprises the front surface central region that is positioned at the front surface center and is positioned at the peripheral region of front surface central region periphery, front surface center to central region edge The shortest arc length at any point is 1.1mm, and the central area of the front surface contains at least one ellipsoidal or ellipsoidal arc. The middle part is a sphere or an arc of a sphere and the middle part of the central area of the front surface is an ellipsoid or an arc of an ellipsoid. A sphere or an arc of a sphere, or a mixture of a plurality of different ellipsoids or arcs of an ellipsoid mixed with a plurality of different spheres or arcs of a sphere, and the peripheral area of the front surface contains at least one ellipsoid or an arc of an ellipsoid The arc segment can be an ellipsoid or an arc of an ellipsoid, or multiple ellipsoids or arcs of an ellipsoid, or a mixture of an ellipsoid or an arc of an ellipsoid and a sphere or an arc of a sphere , wherein the ellipsoid or the arc of the ellipsoid can be one or more, the sphere or the arc of the sphere can be one or more, and the major axis of the ellipsoid or the arc of the ellipse and the short The ratio of the axis is greater than 1.0, and the major axis value is greater than 1.0mm and less than 100mm. The radius of the spherical surface or spherical arc is greater than 1mm and less than 100mm.

The rear surface can be selected from spherical, aspherical, multi-arc spherical, multi-arc aspheric, multi-region spherical, multi-region aspheric or their combination, such as the rear surface is composed of one or more spherical or spherical arcs , the rear surface is also an arc segment containing one or more ellipsoids or ellipsoids.

The rear surface can be shown in Figure 1, from the center to the edge, it is divided into two regions, the central region of the rear surface and the peripheral region of the rear surface, the central region of the rear surface is spherical or ellipsoidal, and any The shortest arc length of one point 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 can also be shown in Figure 2. From the center to the edge, it can be divided into the central region of the rear surface, the peripheral region of the rear surface and the edge arc region of the rear surface. The central region of the rear surface is a spherical or ellipsoidal surface. The shortest arc length of any point on the edge of the central area of the surface is in the range of 1.0mm-15.0mm. The peripheral area of the back surface is composed of a spherical arc or ellipsoidal arc. The shortest distance from the center of the back surface to any point on the edge of the peripheral area of the back surface The arc length is in the range of 1.0mm-20.0mm. The arc 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 arc area of the rear surface is 1.0mm-20.0 mm range.

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

In the present invention, since the shortest arc length from the center of the front surface to any point on the edge of the central region is 1.1 mm, the central region of the front surface may at least include one ellipsoid or ellipsoid arc, or at least include two or more spheres and Spherical arc segment. The curved surface composed of ellipsoidal or multi-spherical surfaces is based on the characteristics of the paracentric hyperopic defocus of the human eye. The curvature radius of each point on the curved surface is constantly changing, and the curvature radius of the front surface of the lens is continuously increased to increase the diopter to reduce the paracentric hyperopic defocus. The phenomenon of defocusing solves the technical problem that the existing rigid contact lenses do not reduce the defocusing of paracentric hyperopia.

Claims (14)

1. A rigid contact lens, comprising a front surface and a back surface, the front surface including a front surface central area positioned at the center of the front surface and a peripheral area positioned outside the front surface central area, characterized in that: the front surface The shortest arc length from the center of the surface to any point on the edge of the central area is 1.1 mm, and the central area of the front surface contains at least one ellipsoid or an arc of an ellipsoid. 2. The rigid contact lens according to claim 1, characterized in that: the central area of the front surface further includes at least two spherical surfaces or arc segments. 3. The rigid contact lens according to claim 1, characterized in that: the ratio of the major axis to the minor axis of the ellipse spherical surface or ellipse arc is greater than 1.0, and the major axis value is greater than 1.0 mm and less than 100.0 mm. 4. The rigid contact lens according to claim 2, characterized in that: the radius of the spherical surface or spherical arc section is greater than 1.0mm and less than 100.0mm. 5. The rigid contact lens according to claim 1 or 2 or 3 or 4, characterized in that: the peripheral area of the front surface at least includes an ellipsoid or an arc of an ellipsoid. 6. The rigid contact lens according to claim 1 or 2 or 3 or 4, characterized in that: the peripheral area of the front surface contains at least two spherical surfaces or arc segments of spherical surfaces. 7. The rigid contact lens according to claim 5, characterized in that: the ratio of the major axis to the minor axis of the ellipse sphere or ellipse arc is greater than 1.0, and the major axis value is greater than 1.0mm and less than 100.0mm. 8. The rigid contact lens according to claim 6, characterized in that: the radius of the spherical surface or spherical arc section is greater than 1.0mm and less than 100.0mm. 9. The rigid contact lens according to claim 1 or 2 or 3 or 4, characterized in that: the rear surface is spherical or/and aspheric or/and multi-arc spherical or/and multi-arc aspheric Or/and a combination of a multi-region spherical surface or/and a multi-region aspheric surface. 10. The rigid contact lens according to claim 1 or 2 or 3 or 4, characterized in that: the rear surface is composed of one or more spherical surfaces or spherical arc segments. 11. The rigid contact lens according to claim 1 or 2 or 3 or 4, characterized in that: the rear surface at least includes an ellipsoid or an arc of an ellipsoid. 12. The rigid contact lens according to claim 1 or 2 or 3 or 4, characterized in that: the back surface is divided into two areas, the central area of the back surface and the peripheral area of the back surface, from the center to the edge. The central area of the rear surface is spherical or ellipsoidal, 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, and the peripheral area of the rear surface is a spherical arc or ellipsoid Composition of arcs. 13. The rigid contact lens according to claim 1 or 2 or 3 or 4, characterized in that: the rear surface is divided into the central region of the rear surface, the peripheral region of the rear surface and the edge arc of the rear surface from the center to the edge. region, the central region of the rear surface is spherical or ellipsoidal, the shortest arc length from the center of the rear surface to any point on the edge of the central region of the rear surface is in the range of 1.0mm-15.0mm, and the peripheral region of the rear surface consists of A spherical arc segment or an ellipsoidal 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, and the arc area of the rear surface is composed of a spherical The shortest arc length from the center of the rear surface to any point on the edge of the arc region of the rear surface is in the range of 1.0mm-20.0mm. 14. The rigid contact lens as claimed in claim 1 or 2 or 3 or 4, characterized in that: the back surface is divided into the central area of the back surface and the sub-center of the back surface from the center of the back surface to the edge. region, the peripheral region of the rear surface and the edge arc region of the rear surface, the central region of the rear surface is spherical or ellipsoidal, and the shortest arc length from the center of the rear surface to any point on the edge of the central region is in the range of 1.0mm-15.0mm, The sub-central region of the rear surface is composed of a spherical arc segment or an ellipsoidal arc segment, the shortest arc length from the center of the rear surface to any point on the edge of the sub-central region of the rear surface is in the range of 1.0mm-20.0mm, and the rear surface The surface peripheral area is composed of a spherical arc segment or an ellipsoidal arc segment, and the shortest arc length from the center of the rear surface to any point on the edge of the rear surface peripheral area is in the range of 1.0mm-20.0mm; the rear surface edge arc The area is composed of a spherical arc segment or an ellipsoidal arc segment, and the shortest arc length from the center of the rear surface to any point on the edge of the arc area of the rear surface is in the range of 1.0mm-20.0mm.