In one aspect, the present invention provides an ophthalmic lens (e.g., an IOL) that includes an optic having an anterior surface and a posterior surface disposed about an optical axis. At least one of the surfaces (e.g., the anterior surface) has a profile characterized by superposition of a base profile and an auxiliary profile. The auxiliary profile can include an inner region, an outer region and a transition region between the inner and the outer regions, where an optical path difference across the transition region (i.e., the optical path difference between the inner and the outer radial boundaries of the transition region) corresponds to a non-integer fraction (e.g., ½) of a design wavelength (e.g., a wavelength of about 550 nm).本發明一方面係提供包括一具有前表面及後表面配置於光軸附近之光件的眼科水晶體(例如IOL)。該等表面中至少一者(例如該前表面)具有一藉基礎輪廓及輔助輪廓之疊置而表示特徵的輪廓。該輔助輪廓可包括內區域、外區域及在該內區域與外區域間之過渡區域,其中跨越該過渡區域之光程差異(亦即在該過渡區域之內與外徑向邊界間之光程差異)相當於設計波長(例如約550奈米之波長)之非整數分數(例如½)。1‧‧‧固定構件2‧‧‧固定構件10‧‧‧人工水晶體(IOL)12‧‧‧光件14‧‧‧前表面16‧‧‧後表面OA‧‧‧光軸
