Imaging quality and anti-eccentricity performance of axial modulation aspherical intraocular lens in model eyes

Objective  To investigate the imaging quality and anti-eccentricity performance of axial modulation aspherical intraocular lens (IOL) in model eyes.

Methods  A ray-tracing program of optical simulation software was used to evaluate the imaging quality of four different IOLs, including PRS60A IOL, Tecnis Z9000 with -0.27 μm spherical aberration aspherical IOL, SofPort AO with 0 μm spherical aberration aspherical IOL and SA60AT spherical IOL under the condition of either centration or decentration. Modulation transfer functions (MTF) under pupil diameters of 3.0, 4.0, and 5.0 mm and IOL decentrations of 0, 0.25, 0.50, and 0.75 mm were calculated and plotted. A Monte Carlo analysis was performed after 1 000 simulations of IOL decentration, ranging from 0 to 0.5 mm, randomly conducted for every IOL.

Results  Under 3.0, 4.0, and 5.0 mm pupil diameters, the centered Tecnis Z9000 IOL had the highest MTF value and the best imaging quality, and when the eccentricity was greater than 0.50 mm, the MTF value decreased significantly, and the imaging quality was significantly reduced. In most cases, the PRS60A IOL was superior to the SofPort AO and SA60AT IOLs when centered and eccentric at various pupil diameters. Monte Carlo analysis showed that the postoperative effects of PRS60A IOL were relatively repeatable and predictable, and the overall imaging quality was better than that of a fixed spherical aberration IOL.

Conclusions  Compared with the fixed spherical aberration IOL, the progressive modulation type aspheric IOL of axial spherical aberration has better imaging quality and tolerance to eccentricity errors in model eyes.