# US 2019/0171038 A1 · Contact lens for presbyopia

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2019/0171038 A1
- Document ID: US20190171038A1
- Status: Published application
- Kind: A1
- Application number: 16/302,048
- Filed: 2017-06-28
- Published: 2019-06-06
- Earliest claimed: 2016-08-12
- Inventors: Seong Jun LEE; Hyun Seung LEE; Hyun Jeong LEE
- Web page: https://patentgrep.com/patent/US20190171038A1

## CPC

- G02C 7/066: {Shape, location or size of the viewing zones}
- G02C 7/02: Lenses; Lens systems {; Methods of designing lenses}
- G02C 7/027: {considering wearer's parameters}
- G02C 7/04: Contact lenses for the eyes (disinfection or sterilisation of contact lenses A61L12/00)
- G02C 7/042: {Simultaneous type}
- G02C 7/045: {Sectorial configuration}
- G02C 7/06: bifocal; multifocal {; progressive (G02C7/041 takes precedence)}
- G02C 7/047: {Contact lens fitting; Contact lenses for orthokeratology; Contact lenses for specially shaped corneae}
- G02C 2202/12: Locally varying refractive index, gradient index lenses
- 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)

## Abstract

The present invention relates to a contact lens for presbyopia and, more specifically, to a contact lens for presbyopia, providing both a far-distance vision area and a near-distance vision area in one contact lens, and continuously forming a lens magnification of the far-distance vision area and the near-distance vision area of the dominant eye and the non-dominant eye while changing the sizes of the far-distance vision area and the near-distance vision area of two eyes according to the dominant eye and the non-dominant eye, such that an intermediate-distance area is partially overlapped, thereby continuously providing a near-distance vision area at a far distance by a neural summation phenomenon that selects a clearly visible image in both eyes.

## Claims

### Claim 1

A contact lens for presbyopia, which has a far-distance part having a far-distance refractive index, and a near-distance part having a near-distance refractive index, both of which are respectively formed in divided areas of the contact lens, comprising;
a central area configured as a far-distance refractive index and providing a main visual field;
a finish area having a ring shape and formed along an edge of the contact lens;
an optical area formed between the central area and the finish area and having refractive power so as to provide a vision area,
wherein the optical area has a sector shape with a certain angle and divides a far-distance part that is an upper area and a near-distance part that is a lower area, and a transition part with a certain width is formed at a boundary between the far-distance part and the near-distance part and alleviates differences in thickness caused by different refractive indices.

### Claim 2 (depends on 1)

The contact lens for presbyopia according to claim 1, wherein in the optical area, the far-distance part and near-distance part of a dominant eye form refractive indices respectively in a 210 degree range and a 150 degree range so as to be symmetrical in a left-right direction,
the far-distance part and near-distance part of a non-dominant eye provide refractive indices respectively in a 150 degree range and a 210 degree range so as to be symmetrical in a left-right direction, and the transition part alleviates differences in thickness in a range of 3 to 7 degrees.

### Claim 3 (depends on 2)

The contact lens for presbyopia according to claim 2, wherein in terms of refractive indices in the optical area at the time of wearing the lens, an intended refractive index of the far-distance part of the dominant eye is configured as emmetropia, an intended refractive index of the near-distance part of the dominant eye is configured as −0.75 D (diopter); and
an intended refractive index of the far-distance part of the non-dominant eye is configured as −0.50 D, an intended refractive index of the near-distance part of the non-dominant eye is configured as −2.25 D.