Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1988-05-11
1989-08-22
Lindsay, Robert L.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
65 39, 156106, 1563071, 264 18, 264 27, 351172, B32B 1700
Patent
active
048592617
ABSTRACT:
A method of producing multifocal ophthalmic lenses having a near vision minor lens element adhesively secured to the ocular surface of a major lens is disclosed. The ocular surface of the major lens is finished to provide an ophthalmic prescription lens. This ocular surface may have a spherical, cylindrical, or prismatic curvature, or any combination thereof, and thus generally may have a complex toric curvature. The minor lens has a predetermined "add power", to provide a near vision segment on the major lens, and preferably is flexible, or is made flexible as by heating, so that it can conform to the shape of the toric curve on the ocular surface of the major lens without distortion or change in its add power. An adhesive material is placed on the major lens, and the minor lens is carefully positioned and gently pressed against it so that it conforms to the curvature of the major lens.
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