Contact lens and the method of manufacturing thereof

Details Contact lens and the method of manufacturing thereof Contact lens and the method of manufacturing thereof

1988-07-11

1990-01-02

Sugarman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351177, G02C 704

Patent

active

048909114

ABSTRACT:
The invention pertains to a new design of contact lenses and to the method of their manufacturing. The contact lens comprising a carrier portion and a hydrophilic supporting portion mediating the contact of the lens with the eye surface, wherein both these parts are made from different materials, with the supporting portion being divided into two or more independent pieces protruding above the concave surface of the lens and lead from the lens circumference towards the lens center which is left free, with gaps being provided between individual pieces. The supporting part is made from a water-swelling synthetic crosslinked hydrogel which has, in the state of full swelling with physiological saline, a swelling capacity of about 40 to 95 percent, whereas the carrier optical portion is made from a transparent material having a modulus of elasticity at least twice that of the modulus of elasticity of the supporting portion. The supporting portion forms a gap of at least 0.01 mm between the eye surface and the uncovered part of the lens.

REFERENCES:
patent: 3489491 (1970-01-01), Creighton
patent: 3973837 (1976-08-01), Page
patent: 3973838 (1976-08-01), Page
patent: 4143949 (1979-03-01), Chen

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