EP0225098A2
Expired / Lapsed
EP
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Bifocal lens
Assignee: University Optical Products Co
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Filing: 1986-11-17
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Granted: —
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Expires: 2006-11-17
Abstract
Abstract A concentric bifocal contact lens (10) is disclosed. The lens has a first distance power correction region (61) of circular periphery in the central portion thereof, surrounded in succession by a concentric near power correction annular region (31) and a concentric second distance power correction annular region (41). Under bright conditions, when the pupil of the eye is small, the central distance power region is helpful in achieving good distance vision.
Inventors
- 👤 J. Warren Blaker
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 16:42
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04; G02C7/041; G02C7/044; G02C7/042
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
57 words
A bifocal lens comprising a body (10) for mounting in conjunction with an eye, the body having a first distance power correction region (61) of substantially circular periphery in the central portion thereof, surrounded in succession by a substantially concentric near power correction annular region (31) and a substantially concentric second distance power correction annular region (41).
Claim 2
Dependent Claim
57 words
A bifocal lens comprising a body (10) for mounting in conjunction with an eye, the body having a first distance power correction region (61) of substantially circular periphery in the central portion thereof, surrounded in succession by a substantially concentric near power correction annular region (31) and a substantially concentric second distance power correction annular region (41).
Claim 3
Dependent Claim
33 words
A lens according to claim 1, wherein the near power annular region (31) has an area which is substantially equal to half the pupil area of the eye under average reading light conditions.
Claim 4
Dependent Claim
34 words
A lens according to claim 2, wherein the near power annular region (31) has an area which is between 35% and 65% of the pupil area of the eye under average reading light conditions.
Claim 5
Dependent Claim
34 words
A lens according to claim 3, wherein the near power annular region (31) has an area which is between 45% and 55% of the pupil area of the eye under average reading light conditions.
Claim 6
Dependent Claim
29 words
A lens according to any of the preceding claims, wherein the diameter of the first distance power correction region (61) is in the range 0.5 mm and 1.5 mm.
Claim 7
Dependent Claim
26 words
A lens according to claim 5, wherein the diameter of the first distance power correction region (61) is in the range 0.5 mm to 1.25 mm.
Claim 8
Dependent Claim
23 words
A lens according to any of the preceding claims, wherein the lens body (10) is formed of a single piece of plastics material.
Claim 9
Dependent Claim
13 words
A lens according to claim 7, wherein the plastics material is silicone acrylate.
Claim 10
Dependent Claim
14 words
A lens according to claim 7, wherein the plastics material is polyhydroxyl ethyl methacrylate.
Claim 11
Dependent Claim
34 words
A bifocal contact lens for the cornea of an eye according to any of the preceding claims, in which the lens body (10) is adapted to fit on the corneal surface of the eye.
Claim 12
Dependent Claim
10 words
A lens according to claim 10, wherein the lens body
Claim 13
Dependent Claim
18 words
(10) has a symmetrically curved rear surface adapted to fit centrally on the corneal surface of the eye.
Claim 14
Dependent Claim
18 words
(10) has a symmetrically curved rear surface adapted to fit centrally on the corneal surface of the eye.
References Cited (Backward Citations)
No citation records indexed.
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