ASTIGMATISM

This trial evaluates Paragon CRT contact lenses with a 5mm optic zone diameter, worn overnight to temporarily reshape the cornea and correct myopia and astigmatism. Participants aged 6 to 35 will wear the lenses daily for a short period, and their comfort and visual performance w…

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 trial compares two types of laser eye surgery—SMILE and ray tracing-guided LASIK—in people with nearsightedness and astigmatism. Each participant will receive one technique in one eye and the other in the other eye, allowing a direct comparison. The goal is to see which meth…

This study looks at whether the stiffness of the cornea influences how much astigmatism (blurring from an irregularly shaped cornea) develops after cataract surgery in people with pseudoexfoliation syndrome, a condition that weakens eye tissues. Researchers will measure corneal b…

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 …