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Title:
HARD CORNEAL CONTACT LENS
Document Type and Number:
WIPO Patent Application WO/2019/192140
Kind Code:
A1
Abstract:
A hard corneal contact lens, comprising a front surface and a rear surface. The front surface comprises a front surface central area (1) located in the center of the front surface and a peripheral area (2) located outside the central area of the front surface. 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. The central area of the front surface may comprise at least one elliptical spherical surface or elliptical spherical arc section, or at least two or more spherical surfaces and spherical arc sections. For a curved surface consisting of the elliptical spherical surface or multi-spherical surface, according to the characteristic of near-center hyperopia defocus of human eyes, the curvature radius of each point on the curved surface is continuously changed, the curvature radius of the front surface of the lens is continuously increased, and the diopter is increased, so as to reduce the phenomenon of near-center hyperopia defocus, thereby solving the technical problem that an existing hard cornea contact lens cannot reduce near-center hyperopia defocus.

Inventors:
SHI, Boyan (No.46, Ruixiang Road Xinhua Industrial Park, Xinhua Street, Huadu Distric, Guangzhou Guangdong 0, 510000, CN)
CHOU, Zernyu (No.46, Ruixiang Road Xinhua Industrial Park, Xinhua Street, Huadu Distric, Guangzhou Guangdong 0, 510000, CN)
Application Number:
CN2018/103243
Publication Date:
October 10, 2019
Filing Date:
August 30, 2018
Export Citation:
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Assignee:
HOFF PHARMACEUTICALS (GUANGZHOU) CO., LTD. (No.46, Ruixiang Road Xinhua Industrial Park, Xinhua Street, Huadu Distric, Guangzhou Guangdong 0, 510000, CN)
International Classes:
G02C7/04
Foreign References:
CN108363219A2018-08-03
US20100128224A12010-05-27
US20100128224A12010-05-27
CN105785591A2016-07-20
CN105785591A2016-07-20
CN106773121A2017-05-31
Attorney, Agent or Firm:
SHENZHEN BAIRUI PATENT&TRADEMARK OFFICE (West #01, 6F Building A, Yihua Complex Building,No. 2 ZhuziLin Qi Rd., Xiangmihu St., Futian Distric, Shenzhen Guangdong 0, 518000, CN)
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