Aspherical artificial cornea lens cylinder, artificial cornea and application method thereof

Abstract

The present invention discloses an aspheric artificial cornea lens column, an artificial cornea and an application method thereof. The lens column is cylindrical as a whole, the front surface of the lens column is convex, the rear surface of the lens column is concave, the rear surface of the lens column is the surface close to the retina, the front surface of the lens column is the surface away from the retina, the front surface and the rear surface of the lens column are both curved surfaces, and both are rotationally symmetric aspheric surfaces. The artificial cornea includes a lens column and a bracket, and the lens column is mounted on the bracket. The fixed position of the lens column is: the vertex of the rear surface of the lens column is 10 to 120 mm away from the retina, the focal plane is perpendicular to the optical axis, and the focal plane inclination angle is 0°. The lens column of the present invention can effectively correct spherical aberration and coma, improve imaging quality; help reduce light scattering, improve visual contrast at night and in low-light environments, and improve patients' visual experience; have a higher tolerance for implant position deviation, and reduce the difficulty of surgery and the risk of postoperative complications.

Claims

1. An aspherical artificial cornea lens column, characterized in that: The overall shape of the lens cylinder is cylindrical. The front surface of the lens cylinder is convex, and the rear surface of the lens cylinder is concave. The rear surface of the lens cylinder is the surface close to the retina, and the front surface of the lens cylinder is the surface far from the retina. Both the front surface and the rear surface of the lens cylinder are curved surfaces and are rotationally symmetric aspherical surfaces. The design formulas for the front surface and the rear surface of the lens cylinder are as follows: in, is the radial height, the z-axis represents the optical axis of the mirror column, the direction from the object side to the imaging side on the optical axis of the mirror column is the positive direction of the z-axis, r is the radial distance from any point on the curved surface to the z-axis, R is the radius of curvature of the vertex of the curved surface, R>0 of the front surface of the mirror column, R<0 of the rear surface of the mirror column, k is the quadratic surface constant, the range of the quadratic surface constant of the front surface of the mirror column is |k|<30 and k≠0, the range of the quadratic surface constant of the rear surface of the mirror column is |k|<30 and k≠0, A4, A6 and A8 are high-order coefficients, The curvature radius R of the front surface of the mirror column is in the range of 2 to 10 mm, and the range of A4 is 0 to 10 -3 mm -3 , the range of A6 is -10 -5 ~0mm -5 、A8 range is 0~10 -7 mm -7 , The curvature radius R of the rear surface of the mirror column is in the range of -0.5 to -30 mm, and the range of A4 is 0 to 10 -4 mm -3 , the range of A6 is -10 -5 ~0mm -5 、A8 range is 0~10 -8 mm -7 .

2. The aspheric artificial cornea lens column according to claim 1, characterized in that: The range of the conic constant k of the front surface of the lens cylinder is -1 < k < 0, and the range of the conic constant k of the rear surface of the lens cylinder is -20 < k < -1 or 2 < k < 20.

3. The aspheric artificial cornea lens cylinder according to any one of claims 1 to 2, characterized in that: The material of the lens cylinder is allyl diglycol carbonate, polycarbonate, acrylic resin or optical glass.

4. An artificial cornea, characterized in that: It includes the aspherical artificial cornea lens cylinder according to any one of claims 1-3 and a bracket, and the aspherical artificial cornea lens cylinder is installed on the bracket.

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