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Publication date
Priority claimed from GBGB9619198.6Aexternal-prioritypatent/GB9619198D0/en
Application filed by Joshua David SilverfiledCriticalJoshua David Silver
Priority claimed from GB9905770Aexternal-prioritypatent/GB2333858B/en
Publication of YU13199ApublicationCriticalpatent/YU13199A/en
Mechanical Light Control Or Optical Switches
(AREA)
Abstract
A variable focus lens comprises first and second transparent, flexible membranes (2) which are tensioned and which define a cavity (30) in which a transparent, silicone oil (4) is sealed. Adjustment of the pressure or volume of the oil in the cavity changes the focal length of the lens. To fabricate the lens, the periphery of each membrane (2) is engaged between two rings (8, 10; 10, 12) of a set of three interengaging rings (8, 10, 12). The interengaged rings are crimped together to tension the membranes (2) and seal the cavity (30).
YU13199A1996-09-131997-09-09Improvements in or relating to variable focus lenses
YU13199A
(en)
HYDROXYETHYL CELLULOSE DERIVATIVES CONTAINING UNITS OF (MET) ACRYLOIL EARRINGS UNITED THROUGH URETHANE GROUPS AND HYDROGEL CONTACT LENSES MADE FROM THEM.