Multifocal optical lens

Details Multifocal optical lens Multifocal optical lens

1989-07-21

1992-01-14

Dzierzynski, Paul M.

Optical: systems and elements

Lens

With graded refractive index

351161, 359721, 359900, G02B 310, G02C 706, G02C 1100, B29D 300

Patent

active

050804723

ABSTRACT:
A multifocal lens useful as a contact lens or implantable as an intraocular lens which comprises at least 3 zones, the first zone comprising a polymer of a specified refractive index, the second zone comprising a polymer having the same repeating units as the polymer comprising the first zone and having a specified refractive index differing from the refractive index of the polymer comprising the first zone by not more than 0.1 units and by not less than 0.01 units and the third zone between the first and second zones comprising a polymer having the same repeating units as the polymers comprising the first and second zones and having a refractive index continuously variable between that of the polymer comprising the first zone and that of the polymer comprising the second zone, the at least three zones being transparent and having no discontinuities visible to the human eye between the zones.

REFERENCES:
patent: 3472581 (1969-10-01), Bronstein
patent: 3560598 (1971-02-01), Neefe
patent: 4798609 (1989-01-01), Grendahl

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