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 investigates whether a new type of eyeglass lens, called a With-the-Rule Astigmatic Defocus Lens, can prevent the development of myopia (nearsightedness) in children aged 6 to 9 who have low hyperopia (farsightedness). The lens creates a 'defocus' signal around the ret…

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 trial compares pain relief from bandage contact lenses soaked in the anti-inflammatory drug ketorolac versus plain lenses after photorefractive keratectomy (PRK), a type of laser eye surgery. PRK often causes significant pain in the first few days as the cornea heals. The st…

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 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 follows 1,000 preschool children (ages 0-6) with refractive errors like nearsightedness, farsightedness, or astigmatism. Researchers aim to map how these conditions progress, identify related health issues, and find the best ways to correct vision early. The goal is to…

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 …