Through-Focus Optical Bench Performance of Extended Depth-of-Focus and Bifocal Intraocular Lenses Compared to a Monofocal Lens.

Abstract

To analyze the optical performance and the effect of halos on modulation transfer function (MTF) of an extended depth-of-focus (EDOF) intraocular lens (IOL) compared to low add bifocal, high add bifocal, and monofocal IOLs. The optical bench system was set up to evaluate the MTF and point spread function images for analyzing halos around the focused image with four different IOLs (TECNIS ZCB00, ZXR00, ZKB00, and ZMB00; Abbott Medical Optics, Inc., Santa Ana, CA). They were measured within a defocus range from +0.50 to -4.00 diopters (D). The EDOF IOL showed good and stable image quality from far to intermediate distance. The near visual performance was limited with the EDOF IOL compared to low add and high add power bifocal IOLs. Monofocal and EDOF IOLs focused light more tightly at far distance and showed higher intensity at the core compared to low and high add bifocal IOLs. The peak core intensity and the relative halo intensity of the EDOF IOL were comparable to those obtained from the monofocal IOL. A negative significant correlation was found in all IOLs between the relative halo intensity and MTF within a defocus diopter range from 0.00 to -3.00 D (P < .05). The EDOF IOL had distance acuity optical quality and halo effect similar to monofocal IOLs but worse near acuity compared to conventional bifocal IOLs. [J Refract Surg. 2018;34(4):236-243.].