Fig. 5

Performance of a state of the art SVSL with an ASPH with a diameter of 60 mm. The target prescription is − 8 dpt SPH and 0 dpt AST. SPH error (a), AST error (b) and CE (c) are plotted over the lens surface. CE normalization is the same as for the − 4 dpt SPH refractive SVSLs in Fig. 2. d-f shows the results for a hybrid SVSL with the same prescription of − 8 dpt SPH and 0 dpt AST, which also includes an ASPH. SPH error (d), AST error (e) and CE (f) are plotted over the lens surface. At an AST error of about 0.1 dpt, which is negligible for such a SVSL, we minimize CE below the level of the − 4 dpt refractive SVSLs