An intraocular lens, comprising an optic (100) having an anterior surface (102) and a posterior surface (104), providing a refractive base power, at least one of the anterior surface and the posterior surface having disposed thereon a profile (150) comprising steps having heights determined by combining three constituent diffractive profiles. The diffractive profiles correspond to powers pi, p2 and p3, the powers being different than one another and each power being a positive power less than about 1D or about 1.25D. Each of the diffractive profiles having step heights causing a phase delay, relative to aqueous fluid, of 0.6 to 1.2 times 2*pi for 546 nm light. The combined profile defined by the function: z = max (diffractive profile (pi), diffractive profile (p2), diffractive profile (p3)), where p3 >； p2 >； pi.
