Nd:Yag Laser Capsulotomy And Iol Surface Damage: Impact On Optical Quality And Retinal Light Distribution

To experimentally assess surface damage induced by Nd:YAG laser on hydrophobic acrylic intraocular lenses (IOLs) and determine its impact on optical quality.

Laboratory optical bench.

Design: Experimental, comparative study.

Methods: Two hydrophobic acrylic IOL models (ZEISS CT LUCIA and Alcon AcrySof IQ) were mounted on a custom holder and exposed to standardized Nd:YAG applications (5, 10, and 15 pulses). Laser–IOL interactions were documented with a PhysioGo.Lite laser system and thermal imaging. Optical performance was evaluated through point spread function (PSF) and modulation transfer function (MTF) measurements. A retinal simulation screen visualized alterations in light distribution. Non-treated IOLs served as controls.

Results: Even minimal laser exposure produced discrete pits on the IOL surface, causing deflection of transmitted light toward peripheral, non-physiological areas. PSF analysis revealed enlarged halos, peripheral spikes, and reduced central peak intensity. MTF values decreased proportionally to the extent of surface disruption. Differences between the two IOL models suggested a material- and design-dependent susceptibility to laser-induced damage

Conclusions: Nd:YAG laser exposure generates measurable surface alterations on hydrophobic acrylic IOLs, leading to optical degradation and atypical retinal light scatter. These data underscore the need for precise posterior capsule focusing during capsulotomy to minimize postoperative visual disturbances