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[Ocutrast--a new procedure for measuring mesopic visual acuity and glare sensitivity].

Measurements of glare sensitivity and mesopic visual acuity are becoming increasingly important for clinical use. They can help to trace indications for cataract operation at an early stage or for YAG laser capsulotomy in cases of mild capsular fibrosis. Up to now, there are no standardized methods for monocular and binocular measurements. A new instrument named Ocutrast has been developed. A study of 100 healthy subjects aged up to 60 years was carried out. Under a field luminance of 1.0 cd/m2 and a contrast of 1:23, visual acuity was measured without and with glare. Standardized conditions were guaranteed. The mean values were lower at higher age, but were not reduced under glare. Additionally two groups of patients (n = 50) were examined. In cataract eyes and in pseudophakic eyes a one line reduction of mesopic visual acuity under glare was found. The conclusion is: a two line reduction of mesopic visual acuity between measurements without and with glare can be regarded to be out of range. Under clinical aspects, this method can contribute to the indication to cataract operation or to YAG laser capsulotomy in pseudophakic eyes.