THEORETICAL-ANALYSIS OF IMAGE DEFOCUS WITH INTRAOCULAR-LENS DECENTRATION

We used a theoretical eye model to evaluate the effect on peripheral i mages when planoconvex, biconvex, and meniscus intraocular lenses (IOL s) decenter 1 mm or 2 mm upward or downward from the pupillary center. A light source was projected from an angle of 0, 20, 28, or 40 degree s downward to a retina with a radius of curvature of 11 mm. When the I OL was centered, the light focused at a single point on the retina. Wh en the IOL was decentered, the light became more dispersed as the inci dent angle of the light increased. The most dispersion was noted with the meniscus IOL; the least with the biconvex IOL. Astigmatism and abe rration, which IOL decentration increases, were thought to cause the i mage defocus. These results suggest that IOL decentration may affect t he sharpness of peripheral images.