Multifocal ophthalmic lens for dim-lighting conditions

Details Multifocal ophthalmic lens for dim-lighting conditions Multifocal ophthalmic lens for dim-lighting conditions

1996-01-26

1997-12-30

Jones, Mary Beth

Prosthesis (i.e., artificial body members), parts thereof, or ai

Eye prosthesis

Corneal implant

623 6, 351161, A61F 214, A61F 216

Patent

active

057024405

ABSTRACT:
A multifocal ophthalmic lens, having outer annular zones with vision correction powers less than a far vision correction power of the patient, is disclosed. These additional annular zones come into play, when the pupil size increases under dim lighting conditions, to thereby compensate for the near-vision powered annular zones. The net effect of the additional near vision annular zones and the additional annular zones having power less than the far vision correction power is to shift the best quality image from in front of the retina to an area on the retina of the eye, to thereby reduce halo effects and improve image contrast.

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