Refractive error

This trial tests whether a device called OcuLign, which automatically adjusts for eye rotation during SMILE surgery, corrects astigmatism better than the standard manual marking method. Adults aged 18 to 40 with stable myopia and astigmatism will have one eye treated with each me…

This study compares two types of spectacle lenses designed to slow the progression of myopia (nearsightedness) in children aged 6 to 10. The goal is to see if the new test lenses are as comfortable and easy to adapt to as the control lenses during the first two weeks of wear. Chi…

This study tests two new types of multifocal glasses designed to manage myopia (nearsightedness) in children aged 8 to 15. Twenty kids who already wear myopia-control glasses will try each new design for a short time to see how well they see and how comfortable they feel. The goa…

Researchers are testing a new device called SmartEyes that measures refractive errors, which are vision problems like nearsightedness. The study involves 200 children and teens aged 6 to 17 who need eye exams. The trial compares SmartEyes with standard equipment and subjective re…

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 a structured referral tracking program helps adults in Pakistan complete follow-up eye care after community screenings. 500 participants will receive either standard referral or extra support like counseling and weekly reminders. The goal is to prevent bl…

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…

After cataract surgery, the membrane holding the artificial lens can turn cloudy, blurring vision. The standard fix is a quick laser procedure called Nd:YAG capsulotomy, but doctors disagree on whether it shifts the lens. This study measures the lens position in 80 people using t…

This study checks how accurately eight different formulas predict the lens power needed for people with very short or very long eyes after cataract surgery. Researchers will measure the actual vision result and compare it to what each formula predicted. The goal is to find which …

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 surveys about 2,800 adults aged 65 and older in Xinxing County, China, to measure how many have untreated vision or hearing problems. Participants receive eye exams, hearing tests, and questionnaires. The goal is to provide local health services with data to improve ca…

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 why many people in rural Assam who are referred for eye care don't make it to the hospital for treatment. Researchers will test new ways to help patients complete their referrals, like providing transport and reminders. The goal is to increase the number of pe…

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 will measure how pupil size and eye shape affect visual quality in 300 people with normal eyes or after refractive surgery. Researchers will use questionnaires and special instruments to track symptoms and eye measurements. The goal is to better understand what influen…

This study looks at children born prematurely who had retinopathy of prematurity (ROP), a disease that can cause blindness. Some were treated with laser, others with injections, and some had ROP but no treatment. Researchers will compare their vision and retina structure to see w…

This study tests a special program designed to improve critical thinking, reflective thinking, and motivation to learn in nursing students. About 243 students will take part in the program, which focuses on building skills like problem-solving and open-mindedness. Researchers wil…

This study will check the eyes of 3,000 people in Xinxing County, including schoolchildren, seniors, and people with diabetes. The goal is to measure how common vision problems like nearsightedness and cataracts are, and how well they are being treated. Participants will have sim…

This study looks at how the length of the eye and the amount of nearsightedness or farsightedness relate to the health of the optic nerve and surrounding layers. Researchers will use a special camera (OCT) to take detailed images of the eye in 266 adults. The goal is to better un…