# US 8,783,863 B2 · Contact lens for myopia control > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,783,863 B2 - Document ID: US8783863B2 - Status: Granted - Kind: B2 - Application number: 13/604,130 - Filed: 2012-09-05 - Published: 2013-11-07 - Granted: 2014-07-22 - Earliest claimed: 2012-05-07 - Assignees: Largan Medical Co., Ltd. - Applicants: Chung Lin Wang - Inventors: Chung Lin Wang - Web page: https://patentgrep.com/patent/US8783863B2 ## CPC - G02C 7/044: {Annular configuration, e.g. pupil tuned} - G02C 7/04: Contact lenses for the eyes (disinfection or sterilisation of contact lenses A61L12/00) - A61F 9/00: Methods or devices for treatment of the eyes; Devices for putting in contact-lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand (caps with means for protecting the eyes A42B1/0181; visors for helmets A42B3/22; eye baths A61H35/02; sunglasses or goggles having the same features as spectacles G02C) - G02C 2202/24: Myopia progression prevention - G02C: SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES (trial frames for testing the eyes A61B3/04; goggles or eyeshields not having the same features as spectacles A61F9/00) - A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C) ## Abstract This invention provides a contact lens for myopia control comprising: an object-side surface comprising a central zone, a transition zone and a peripheral zone which are concentric and have different refractive power, at least one of the three zones being aspheric; and an image-side surface; wherein the central zone provides correction power to focus a foveal image on the retina, the peripheral zone provides a myopic defocus effect by generating a para-fovea image in front of the retina, and the transition zone with one or more focuses provides a refractive power in diopter (D) ranging from +0.25 D to +8.00 D. ## Claims ### Claim 1 A contact lens for myopia control comprising: an object-side surface comprising a central zone, a transition zone, and a peripheral zone which are concentric and connected in a sequential order, the three zones having different refractive power and at least one of which being aspheric; and an image-side surface, wherein the central zone has an outer radius the same as an inner radius of the transition zone, the transition zone has an outer radius the same as an inner radius of the peripheral zone; wherein the transition zone with one or more focuses provides refractive power in diopter (D) ranging from +0.25 D to +8.00 D; and wherein the peripheral zone has an outer radius ranging from 5.49 to 7.7 mm. ### Claim 2 (depends on 1) The contact lens for myopia control according to claim 1, wherein the central zone has an outer radius ranging from 0.5 to 2.6 mm. ### Claim 3 (depends on 1) The contact lens for myopia control according to claim 1, wherein the transition zone has an inner radius ranging from 0.5 to 2.6 mm and an outer radius ranging from 1 to 3.9 mm. ### Claim 4 (depends on 1) The contact lens for myopia control according to claim 1, wherein the peripheral zone has an inner radius ranging from 1 to 3.9 mm. ### Claim 5 (depends on 1) The contact lens for myopia control according to claim 1, wherein the outer radius of the central zone is R1, the outer radius of the transition zone is R3, and they satisfy a relation of 1