Multifocal phase plate with a pure refractive portion
OwnerAllen L. Coheninventor
Life of this patent
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Abstract
An ophthalmic contact lens with a phase plate and a pure refractive portion within its optic zone. The invention embraces an ophthalmic contact lens of the Cohen lens design with a phase plate and a pure refractive portion within its optic zone.
Claims34
An ophthalmic contact lens with a phase plate and a pure refractive portion within its optic zone.
An ophthalmic contact lens of the Cohen lens design with a phase plate and a pure refractive portion within its optic zone.
A multifocal lens of the Cohen lens design containing, in an optically receptive area, a phase plate and a pure refractive portion which possesses only a zero-order diffraction that symmetrically retards the light passing therethrough.
A multifocal lens containing a phase plate and a pure refractive portion which possesses only a zero-order diffraction that symmetrically retards the light passing therethrough.
Dependencies are inferred from the claim text.