Fig. 97. Anteriorly reflected light from the fundus can be redirected posteriorly by a reflection from the anterior surface of the human lens or IOL to form an internally reflected retinal glare image. A. The unaccommodated human lens, with a steep anterior surface curvature (10 mm), defocuses internal surface reflections to a large area that is of very low intensity and not noticeable. B. An IOL with a flat anterior surface focuses internal surface reflections to a small, concentrated area that is of high intensity and may be noticeable. (From Intraocular lens surfaces and their relationship to postoperative glare. J Cataract Refract Surg 29:336, 2003.)