Comparative Study of Photopic and Mesopic Distance, Intermediate and Near Visual Acuity, and Spectacle Independence

Inclusion Criteria: * 18 years of age or older * Status post bilateral cataract or refractive lens surgery (with or without LRI) and implantation of Tecnis™ Multifocal IOL or Crystalens™ HD Accommodating IOL * Best-corrected ETDRS equivalent visual acuity of 20/30 or better in each eye * Naturally dilated pupil size (in dim light) \> 3.5 mm (with no dilation medications) for both eyes * Clear intraocular media (no posterior capsular opacification, or status post YAG capsulotomy) * Availability, willingness, and sufficient cognitive awareness to comply with examination procedures Exclusion Criteria: * Ocular disease which could potentially limit uncorrected visual acuity or visual performance. * Use of systemic or ocular medications that may affect visual outcomes * Acute or chronic disease or illness that would increase risk or confound study results (e.g. diabetes mellitus, immunocompromised, etc.) * Uncontrolled systemic or ocular disease * History of ocular trauma * History of ocular surgery other than that required for inclusion in this study * Amblyopia or strabismus * Known pathology that may affect visual acuity; particularly retinal changes that affect vision (macular degeneration, cystoid macular edema, proliferative diabetic retinopathy, etc.) * Diagnosed degenerative visual disorders (e.g. macular degeneration, or other retinal disorders) that are predicted to cause future acuity losses to a level of worse than 20/30 * Subjects who may be expected to require retinal laser treatment or other surgical intervention * Capsule or zonular abnormalities that may affect postoperative centration or tilt of the lens (e.g. pseudoexfoliation syndrome) * Pupil abnormalities (non-reactive, tonic pupils or abnormally shaped pupils)