Glare and mesopic vision before and after cataract surgery.

Glare and mesopic vision were tested before and after cataract surgery in addition to the standard visual acuity measurement. Quantitative data on the amount of improvement in these functions are presented. Preoperatively, glare and mesopic vision were reduced to 20/200 or less in most patients. Postoperatively, a statistically significant improvement in the three visual functions measured was found in all five octaves of presurgical visual acuity.