traylight Effect with Aging and Len Extraction Original Reearch Article

Purpoe To ae poible gain and loe in traylight value among the population to conider traylight a added benefit of len extraction. Deign In thi cro-ectional deign, data from a multicenter tudy on viual function in automobile driver were analyzed. Method On both eye of 2,422 ubject, viual acuity (logarithm of the minimum angle of reolution [logMAR] in tep of 0.02 log unit), traylight on the retina (pychophyical compenation comparion method), and len opacity (lit-lamp coring uing the Len Opacitie Claification ytem III [LOC III] ytem) were determined. Three group were defined: 220 peudophakic eye, 3,182 noncataractou eye (average LOC III core, <1.5), and 134 cataractou eye (average LOC III core, >3.0). Reult Noncataractou traylight value increae trongly with age a: log() = contant + log(1 + (age / 65)4), doubling by the age of 65 year, and tripling by the age of 77 year. Population tandard deviation around thi age norm wa approximately 0.10 log unit. The cataract eye (in thi active driver group) had relatively mild traylight increae. In peudophakia, traylight value may be very good, better even than in the noncataract group. Viual acuity and traylight were found to vary quite independently. Concluion Len extraction hold promie not only to improve on the condition of the cataract eye, but alo to improve on the age-normal eye. Len extraction potentially revere the trong age increae in traylight value, quite independently from viual acuity.