US 11,953,761 B2
Geometric volume control corneal refractive therapy contact lens
Jerome A. Legerton, Jupiter Inlet Colony, FL (US); Jidong Liu, Shanghai (CN); and Gaozhi Liu, Shenyang (CN)
Assigned to Shenyang Kangende Medical Science and Technology Co., Ltd., Shenyang (CN)
Filed by SHENYANG KANGENDE MEDICAL SCIENCE AND TECHNOLOGY CO., LTD., Shenyang (CN)
Filed on Feb. 15, 2023, as Appl. No. 18/110,037.
Application 18/110,037 is a continuation of application No. 17/616,154, granted, now 11,774,779, previously published as PCT/CN2021/078909, filed on Mar. 3, 2021.
Prior Publication US 2023/0221581 A1, Jul. 13, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G02C 7/04 (2006.01); A61F 9/013 (2006.01)
CPC G02C 7/047 (2013.01) [A61F 9/013 (2013.01)] 24 Claims
OG exemplary drawing
 
1. A contact lens for reshaping a pretreatment cornea of an eye of a patient, comprising:
an anterior surface; and
a posterior surface having a semi-meridian defining:
a central compression zone to contact the pretreatment cornea,
a volume control zone peripheral to the central compression zone, wherein:
the volume control zone is defined by at least first CP3 and second CP4 geometric control points connected by at least one of a spline, a polynomial, a conic section, or an uncurved segment,
the second geometric control point CP4 is to contact the pretreatment cornea and is peripheral to the first geometric control point CP3, and
the first geometric control point CP3 is positioned to define a predetermined angle between (i) a line connecting the first CP3 and second CP4 control points and (ii) a horizontal line through the second control point CP4,
a secondary compression zone to contact the pretreatment cornea, wherein the secondary compression zone is peripheral to the volume control zone,
a peripheral relief zone peripheral to the secondary compression zone,
a landing zone to contact the pretreatment cornea, wherein the landing zone is peripheral to the peripheral relief zone, and
an edge terminus peripheral to the landing zone.