Multifocal ophthalmic lens
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United States of America Patent
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Jun 10, 2003
Issued Date -
N/A
app pub date -
Feb 26, 2001
filing date -
Jan 26, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
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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