To compare the optical performance of silicone intraocular lenses (IOLs) with that of conventional poly(methyl methacrylate) (PMMA) IOLs.
University hospital outpatient cataract clinic.
Ninety-one patients were randomly assigned to receive a PMMA IOL (n = 48 eyes) or a silicone IOL (n = 43 eyes). Contrast sensitivity was evaluated 4 months after surgery using the Vistech sinusoidal-grating chart and the Pelli-Robson letter sensitivity chart.
No between-group differences were found using the Vistech test. Using the Pelli-Robson test, mean uncorrected contrast sensitivity was 1.59 log units ±0.13 (SD) in the PMMA group and 1.53 ± 0.15 log units in the silicone group. Mean best corrected contrast sensitivity was 1.67 ± 0.11 and 1.63 ± 0.16, respectively. The differences between groups using the Pelli-Robson test were statistically significant (P
< .05). No correlation was found between reduced contrast sensitivity and brownish discoloration or thickness of silicone IOLs or posterior capsule fibrosis.
Contrast sensitivity was lower in patients with silicone IOLs than in those with conventional PMMA lenses.