An intraocular lens is disclosed, which includes a diffractive element witha relatively low add power. The add power may be less than about 2 Diopters, maybe less than about 1 Diopter, or may be in the ranges of 0.5 to 2.5 Diopters, or 1.0lo 2.0 Diopters, or 1.5 to 2.0 Diopters, or 1.0 to 1.5 Diopters. The low-add-powerdiffractive element increases the depth of the focus of the intraocular lens,for example, compared to a similarly shaped intraocular lens without the diffractiveelement. In one embodiment, the depth of focus is defined in terms of a thresholdMTF value at a particular spaiml frequency. The threshold may be an absolute threshold,such as 0.10, 0.15, 0.17, 0.20, 0.25 or 0.30, or may be a relative threshold, suchas a particular percentage of the peak value. The spatial frequency may be 25 linepairs per mm. 50 line pairs per mm. 100 line pairs per mm, or any suitable value.
