The intraocular lens decentering effect on the vision quality for eye with different pupil diameters

The implanted lens inside the eye may be exposed to a decenter during or after cataract surgery, by exposure to a specific accident that leads to a change of the lens position, which leads to a vision deterioration. This paper provides a detailed study about the intraocular lens decentering effect, which was implanted instead of the Liou & Brennan eye model (LBME) crystalline lens. Based on ZEMAX optical design software, the lens was shifted towards the (X and Y) axes by (0, ±0.4, ±1) mm, with pupil diameter values (2.5, 4, and 5) mm. The basic criteria to measure the vision quality as, the modulation transfer function (MTF), spot size (RMS), wave aberration coefficients, and RMS wavefront errors were used. It was found that the image is destroyed as the decenter increases. This effect worsened as the pupil diameter increases due to the increasing aberration, especially spherical and coma aberration. Finally, compression between the IOL effect decentering and the natural crystal lens of the healthy eye was done.