Light scatter and disability glare after intraocular lens implantation.

F orward light scatter measurement provides information about optical imperfections as the cause of glare disability. Glare disability refers to a reduction in visual performance caused by a glare source, resulting in retinal contrast loss secondary to intraocular stray light. Lens extraction reverses the strong age increase in stray light, which is considered an independent source of symptoms. Stray light is 1 possible source of unwanted visual phenomena related to patients with implanted multifocal intraocular lenses (IOLs). Recent studies reported little difference in retinal stray light between patients with monofocal IOLs and patients with multifocal IOLs. Pupil miosis during retinal stray light measurement and neural adaptation after multifocal IOL implantation may overcome possible differences. However, the best way to analyze the change in visual and optical quality of the eye is to measure before and after a surgical procedure. For multifocal IOLs, measurements should be done in refractive lens exchange (RLE) cases. A recent report concluded that higher-order aberration (HOA) levels are similar before and after RLE with multifocal IOL implantation. Then, if patients refer to any visual phenomenon, this may come from the scatter created by multifocality of the IOL; measurements of retinal stray light should be done before and after RLE to corroborate this point. We describe a patient who had symptomatic glare disability despite visual acuity of 20/20 after uncomplicated RLE.