FREE-FORM PROGRESSIVE MULTIFOCAL REFRACTIVE LENS FOR CATARACT AND REFRACTIVE SURGERY
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United States of America Patent
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Issued Date -
May 15, 2014
app pub date -
Nov 8, 2013
filing date -
Nov 9, 2012
priority date (Note) -
Abandoned
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Abstract
A new type of multi-focal lens that has a free-form progressive multifocal front surface consisting of a 16th order polynomial superimposed on a standard conic base surface is described. The center region of the lens is optimized for distance vision, while simultaneously optimizing the rest of the lens for near vision. The resulting free-form even asphere polynomial surface is smooth, unlike present day diffractive multifocal designs. Additionally, this lens design is suitable for both refractive and cataract surgeries.
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