Retinal stray light originating from intraocular lenses and its effect on visual performance
Intraocular lenses are designed for vision correction following cataract removal. The intraocular lens typically replaces a cataractous natural lens that exhibits high levels of light scattering reducing contrast vision. The amount of scattering is significantly reduced with an intraocular lens, though it is rarely quantified, and in some cases results in patient complaints. Letter chart tests are not capable to assess this aspect of vision. In this thesis we describe laboratory methods to determine intraocular stray light and techniques to determine the visual effects of stray light in humans. Impact on vision was measured in healthy test persons when their retinal stray light levels were slightly elevated. The stray light levels of intraocular lenses were found to be design and material dependent which may cause visual symptoms.
Continued investigations on stray light and its effect on vision may lead to improved optical designs of intraocular lenses and possibly improved refractive correction procedures. Ultimately, it may substantially contribute to healthy aging, and reduce the burden on the health care system.