Concentric aspheric multifocal lens designs

Details Concentric aspheric multifocal lens designs Concentric aspheric multifocal lens designs

1995-05-04

1998-02-03

Nelms, David C.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

351177, 623 6, G02C 704, G02C 702, A61F 216

Patent

active

057150311

ABSTRACT:
Concentric aspheric multifocal lens designs are disclosed which use a combination of an aspheric front surface, which results in aberration reduction and contrast vision enhancement, along with a concentric multifocal back surface, to produce a lens design which affords clear vision at a distance and also near without a loss in contrast which is generally typical of prior art simultaneous vision, concentric multifocal lens designs. The aspheric surface improves the modulation transfer function (MTF) of the lens eye combination which improves the focus and contrast of both distance and near images. The design form is valid for contact lenses and intraocular lenses.

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patent: 5406341 (1995-04-01), Blum et al.
patent: 5436678 (1995-07-01), Carroll

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