Novel rigid gas permeable cornea contact lens

Abstract

The invention discloses a novel rigid gas permeable cornea contact lens, comprising a peripheral arc of the lens. The inner rim of the peripheral arc of the contact lens is provided with two symmetric stable pterions or three stable pterions. The inner rims of the three stable pterions along the peripheral arc are equidistantly or disequidistantly distributed. Each stable pterion is 1 / 6-1 / 3 of the inner rims. The distance of inner top end and outer top end of the stable pterion is between 0.2 and 7mm. The inside arc surface of the stable pterion can be a conical arc with an arch bottom angle of between 20 and 40 degrees. The inside arc surface of the stable pterion can be a spherical arc with the radius of curvature of between 6 and 25mm. The inside arc surface of the stable pterion can be a non-spherical arc. The difference of curvature radiuses of the starting point and the finishing point of the non-spherical arc is between 0 and 1mm, and the curvature radius of the starting / finishing point is between 6 and 25mm. The structure of the lens improves the stability and the centralization of various lenses in cornea, so that various cornea contact lenses can achieve the state that the comfort state is more comfortable, and the eyesight is more perfect.

Description

technical field [0001] The invention relates to a corneal contact lens, in particular to a novel rigid air-permeable corneal contact lens. Background technique [0002] Compared with soft contact lenses, hard contact lenses not only improve the oxygen permeability, but also ensure the firmness of the material, and have good wettability and anti-precipitation. Its effect on the control and correction of juvenile true myopia and keratoconus has been clinically verified by ophthalmologists at home and abroad for many years, and has been affirmed. At present, hard contact lenses are usually only placed in the conjunctival cavity of the cornea and scleral limbus, and directly adhere to the upper and lower palpebral conjunctiva and cornea. Due to the irregularity of the human cornea, the positioning of various hard contact lenses on the cornea is not ideal. status. Contents of the invention [0003] The purpose of the present invention is to address the above problems and pro...

AI Technical Summary

Problems solved by technology

At present, hard contact lenses are usually only placed in the conjunctival cavity of the cornea and scleral limbus, and directly adhere to the upper and lower palpebral conjunctiva and cornea. Due to the irregularity of the human cornea, the positioning of various hard contact lenses on the cornea is not ideal. status

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