Astigmatism

This study checks if a Turkish version of the DDIVAT digital vision test gives the same results as the standard Snellen eye chart. About 200 Turkish-speaking adults, with or without glasses, will take both tests. No drugs or procedures are involved, and there are no risks.

This study tests whether placing surgical cuts in specific parts of the cornea during cataract surgery can reduce astigmatism (blurry vision from an irregularly shaped cornea) and lower the need for glasses afterward. About 100 people with cataracts and astigmatism will be random…

This study tests a new excimer laser for LASIK surgery to correct mild nearsightedness (up to -1.00 diopter) with or without astigmatism. About 32 adults aged 22 and older will receive the treatment in one or both eyes. The goal is to see if the laser safely and accurately improv…

This study will use a special imaging device (AS-OCT) to measure the thickness of the cornea's outer layer in 360 adults with nearsightedness, farsightedness, astigmatism, or normal vision. The goal is to see if different vision problems have unique thickness patterns. Participan…

This study looks at whether a new, objective way to fit toric contact lenses (for astigmatism) gives the same results as the traditional subjective method. About 45 adults with astigmatism will have their lens prescription checked both ways. The goal is to see if the new method c…

This study looks at how well REVIVE samfilcon B custom toric contact lenses work for people with astigmatism. About 30 adults will wear the lenses, and eye doctors will rate their satisfaction after 14 days. The goal is to see if these lenses provide clear vision and are easy to …