590292 A monofocal intraocular lens 10, comprising an optic having an anterior surface 14 and a posterior surface 12 disposed about an optical axis OA, at least one of the surfaces being toric and at least one of the surfaces comprising at least one inner refractive region 18 having a nominal optical power, at least one outer refractive region 20 having the nominal optical power, and a refractive transition region 22 disposed between the inner and outer regions, the transition region 22 extending from an inner radial boundary to an outer radial boundary. The transition region 22 is adapted such that a phase of radiation incident thereon varies monotonically from the inner to the outer boundary so as to generate a phase shift between the outer and inner boundaries. The phase shift is characterized by an elected non-integer fraction of a design wavelength in the visible spectrum such that a first portion of an incoming wavefront in the inner refractive region and a second portion of the incoming wavefront in the outer refractive region converge to produce an effective optical power different from the nominal optical power thereby creating a depth of focus.
