Patent FR2281584A1 successfully refreshed from Google Patents.
FR2281584A1
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FR
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Soft contact lens for astigmatism correction - has toroidal surfaces, and is stabilised by single or double truncation
Assignee: Individual
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Filing: 1974-08-08
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Granted: —
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Expires: 1994-08-08
Abstract
Abstract The lens may be stabilised by a single or double truncation, a ballast prism (prism with internal base) or a ballast prism in conjunction with a single or double truncation. The rear surface may be toroidal while the front surface is spherical, or vice versa, or both surfaces may be toroidal. The front surface may be bifocal while the rear surface is toroidal or the front surface may be spherical while the toroidal rear surface is bifocal. The toroidal surface of the corner is matched to the lens in order to correct astigmatism.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-11-08 06:12
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/02; A61B3/028; A61B3/04; G; G02; G02C; G02C7/00; G02C7/02; G02C7/04; G02C7/041; G02C7/048
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