Patent EP0169599A2 successfully refreshed from Google Patents.
EP0169599A2
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EP
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Trifocal eye-contactlens
Assignee: Visser contactlenzenpraktijk BV
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Filing: 1985-07-04
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Granted: —
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Expires: 2005-07-04
Abstract
Abstract Trifocal eye-contactlens consisting of three, mainly concentric parts. - A central part correcting the course of lightrays in case of myopia, an outer circular part, correcting the rays in case of presbyopia and between these two parts a - circular - transitium-part, in which the focal distance changes gradually from the value of the central part, to that of the outer part.
Inventors
- 👤 R. Visser
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 12:02
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/04; G02C7/041; G02C7/044; G02C7/042
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
136 words
Eye-contactlens, consisting of mainly concentric parts, having mutually different focal distances, characterised in that the lens consists of at least three such parts: - a central part (4), confined by the brims of a bowl-shaped recess of the inside/concave side of the lens; - a brim-part (6) around the periphery of the lens, having at the outside - the convex side - of the lens a surface with a radius which is smaller than that of the surface of the inner part and having a thickness which from the inside to the outside decreases gradually; - a part (5), situated between the central part (4) and the brim-part (6), the surfaces of which, both at the inside and at the outside of the lens connect the surfaces of the central part (4) and the brim-part (6).
Claim 2
Dependent Claim
136 words
Eye-contactlens, consisting of mainly concentric parts, having mutually different focal distances, characterised in that the lens consists of at least three such parts: - a central part (4), confined by the brims of a bowl-shaped recess of the inside/concave side of the lens; - a brim-part (6) around the periphery of the lens, having at the outside - the convex side - of the lens a surface with a radius which is smaller than that of the surface of the inner part and having a thickness which from the inside to the outside decreases gradually; - a part (5), situated between the central part (4) and the brim-part (6), the surfaces of which, both at the inside and at the outside of the lens connect the surfaces of the central part (4) and the brim-part (6).
Claim 3
Dependent Claim
36 words
Eye-contactlens according to claim 1, characterised in that, measured in radial direction, the width of the part (5), situated between the central part (4) and the brim-part (6) is 0,3 - 0,5 mm, preferentially 0,4 mm.
References Cited (Backward Citations)
No citation records indexed.
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