Henry Ford Hospital Medical Journal


Improvements in intraocular lens implants during the past ten years have revolutionized cataract surgery. Both anterior and posterior chamber lenses are currently in wide use, but the optical superiority of the posterior chamber location has yet to be demonstrated. To do so, a more detailed analysis is required of visual function than is clinically routine. Also required is appreciation that the retina is an integral part of the eye's optical system because of its directional characteristics, which are known as the Stiles-Crawford effect. The optical quality of the pseudophakic eye is affected by the optics of the implant, its centration, and its anteroposterior position. Contrast sensitivity measurements in numerous pseudophakic patients are therefore necessary to determine the actual differences of in situ optical performances among different types of lens implants.