Diffractive multifocal contact lens

Abstract

Certain aspects of the present disclosure provide a contact lens with a stepped-transition diffractive design. An example contact lens has an optical zone on its anterior or posterior surface. The optical zone has a circular diffractive zone that has a stepped-transition diffractive surface profile that provides at least one first refractive optical element and at least one diffractive optical element and optionally an annular refractive zone comprising a second refractive optical element. The at least one diffractive optical element comprises a plurality of concentric annular transition surface zones surrounding a central circular area of the contact lens. The stepped-transition surface profile has a monotonically increasing surface sagitta (SAG) in a direction radiating from the central axis of the contact lens.

Images