While having cataract surgery in one is likely to improve vision and visual functioning, the best results are found in patients who undergo second eye cataract surgery. Researchers reporting in the journal Ophthalmology studied the impact that cataracts and cataract surgery have on clinical measurements of vision, reading speed, objective mobility performance and subjective visual functioning. In this study, 29 participants had cataract surgery on both eyes, 90 participants had cataract surgery in one eye and 1620 participants had no cataract surgery. The results showed that patients who had the cataract surgery in both eyes demonstrated better visual performance, better mobility-based task performance and even scored better on the Activities of Daily Vision Scale (ADVS). Thus, even though patients might find a great improvement after having cataract surgery in only one eye, the data indicate that having cataract surgery on both eyes provides the best visual functioning.