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US 5,108,169 AGranted
Contact lens bifocal with switch
OwnerRobert B. Mandellinventor
Life of this patent
Estimating the term…
Abstract
A bifocal contact lens which contains two optical powers and a structure which serves as a switch to determine which power is operative as the wearer looks alternatively at objects located at various distances. The lens switch is designed so as to be triggered by the upper lid as it covers and uncovers various portions of the contact lens when the lens wearer is looking alternatively at objects located at various distances.
Claims14
A bifocal contact lens, comprising:
- a body of refractive material including two zones of different power;
- and
- a layer of eyelid-heat sensitive material borne by said body;
- said layer being so distributed as to substantially reduce the passage of light through one of said zones when it receives heat from an overlying portion of an eyelid.
1 more element
Dependencies are inferred from the claim text.