Soft contact lens with surface identification and method of usin

Details Soft contact lens with surface identification and method of usin Soft contact lens with surface identification and method of usin

1983-05-05

1985-06-25

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351162, 351177, G02C 704

Patent

active

045250448

ABSTRACT:
A soft contact lens of generally symmetrical concavo-convex configuration and of uniform optical power about its optic axis is provided with an elongated marking in the peripheral portion thereof to permit the user to identify readily the inner surface of the lens. This marking is asymmetrical about its midpoint so that the user can determine the appropriate surface by noting the direction of asymmetry. This marking may be produced as a raised or recessed surface during moulding and casting of the lens, or as a recessed surface subsequently by etching, engraving or the like, or it may be formed by printing of the lens.

REFERENCES:
patent: 3189914 (1965-06-01), Gusewitch et al.
patent: 3712718 (1973-01-01), LeGrand et al.
patent: 4071293 (1978-01-01), Avery
patent: 4193671 (1980-03-01), Erickson et al.
patent: 4194814 (1980-03-01), Fischer et al.
patent: 4268133 (1981-05-01), Fischer et al.
patent: 4309085 (1982-01-01), Morrison

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