Articles: PDF OnlyContrast sensitivity in multifocal intraocular lensesRavalico, Giuseppe M.D.a; Baccara, Fabio M.D.; Rinaldi, Giorgio M.D.Author Information From University Eye Clinic, Trieste, Italy. aReprint requests to Professor Giuseppe Ravalico, Istituto di Clinica Oculistica, c/o Ospedale Maggiore, Piazza Ospedale 1, 34129 Trieste, Italy. Presented in part at the 6th International Congress on Cataract and Refractive Surgery, Florence, Italy, July 1991. Journal of Cataract & Refractive Surgery: January 1993 - Volume 19 - Issue 1 - p 22-25 doi: 10.1016/S0886-3350(13)80274-X Buy Metrics Abstract Contrast sensitivity was measured in two groups of 20 patients each implanted with refractive and diffractive multifocal intraocular lenses and in two control groups of 20 patients each-the first group implanted with a monofocal IOL and the second phakic subjects. All cases had a postoperative follow-up of at least one year and a corrected visual acuity of 20/20- or better. We used two psychophysical tests, Pelli Robson test chart and Vistech 6500 test chart, and an objective test, visual evoked potentials (VEPs). There were no statistically significant differences in contrast sensitivity in the psychophysical tests between the two groups implanted with multifocal IOLs. The situation was different, however, when they were compared with the control group with monofocal IOLs and the group with phakic eyes: the Pelli-Robson test results were not significantly different, but the Vistech 6500 test showed a significant reduction in contrast sensitivity in both groups. The pattern VEPs objective test confirmed these results: no differences were noted between the two different multifocal IOLs, while there was a drop in contrast sensitivity when their results were compared with those of the control groups; the intermediate frequencies were particularly affected by this phenomenon. The contrast sensitivity in patients with multifocal IOLs is reduced despite high visual acuity and this can affect the quality of vision. © Williams & Wilkins 1993. All Rights Reserved.