Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1973-06-05
1976-08-10
Rubin, David H.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
351161, G02C 704
Patent
active
039738388
ABSTRACT:
A contact lens comprising at least two components, one of the components is made of a relatively hard optical material, the other component being made of a hydrophilic material and arranged to extend at least partially over the inner surface of the hard component in the form of a peripheral ring, so that a central zone thereon is uncovered and the ring of hydrophilic material, when in a hydrated state, extends rearwardly of the central zone of the hard component, whereby a void is provided between said central zone and the cornea when the lens is placed in position on the cornea, whereby only the hydrophilic component contacts the cornea.
REFERENCES:
patent: 2117770 (1938-05-01), Row
patent: 2241415 (1941-05-01), Moulton
patent: 2247628 (1941-07-01), Beitel
patent: 2393266 (1946-01-01), Riddell
patent: 3102157 (1963-08-01), Gamber
patent: 3220960 (1965-11-01), Wichterle et al.
patent: 3270099 (1966-08-01), Camp
patent: 3454332 (1969-07-01), Siegel
patent: 3472581 (1969-10-01), Bronstein
patent: 3488111 (1970-01-01), Isen
patent: 3489491 (1970-01-01), Creighton
patent: 3619044 (1971-11-01), Kamath
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