G - Physics – 02 – C
Patent
G - Physics
02
C
G02C 7/04 (2006.01) G02C 7/06 (2006.01)
Patent
CA 2107828
- 21 - ABSTRACT OF THE DISCLOSURE Disclosed is a multifocal contact lens having a first optical power on a portion of the optical region of the back surface of the lens, a second optical power on another portion of the optical region of the back surface portion of the lens, and a third optical power over the entire optical region of the front surface of the lens. The first optical power, in combination with the third optical power produces a basic, distance corrective optical power while the second optical power, more positive than the first, produces in combination with the third optical power a difference corrective power to provide the appropriate near focal length for an individual requiring bifocals. This type of bifocal contact lens can be readily manufactured by molding with a convex mold surface containing the inverse of the first and second optical powers selected for the back surface of the lens and a concave mold piece containing the inverse of the third optical power selected for the front surface of the lens.
Armitage Brian S.
Crowe Carl G.
Guillon Michel
Poling Timothy R.
Roffman Jeffrey H.
Johnson & Johnson Vision Products Inc.
Swabey Ogilvy Renault
LandOfFree
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