Impact of Capsular Tension Ring on Intraocular Lens Position in Retinitis Pigmentosa Cataract Patients

Launched by ZHONGSHAN OPHTHALMIC CENTER, SUN YAT-SEN UNIVERSITY · Aug 10, 2025

Keywords

ClinConnect Summary

This clinical trial is studying whether using a small device called a capsular tension ring (CTR) during cataract surgery can help keep the artificial lens (intraocular lens, or IOL) in a better position for people who have retinitis pigmentosa (RP), a condition that affects the eyes. Each participant will have the CTR placed in one eye during surgery, while the other eye will have the usual procedure without the ring. Researchers will then compare vision, lens position, and any complications between the two eyes to see if the ring makes a difference.

Adults aged 18 and older who have been diagnosed with retinitis pigmentosa and have cataracts in both eyes that need surgery may be eligible to join. People with a history of eye surgery, very weak support structures in the eye, certain other eye diseases, or serious health problems like uncontrolled diabetes or heart disease will not be able to participate. If you join, you can expect one eye to receive the special device during cataract surgery while the other eye gets the standard surgery, and then both eyes will be closely monitored afterward to check vision and healing. This study is not yet recruiting participants but aims to help improve outcomes for people with RP undergoing cataract surgery.

Gender

ALL

Eligibility criteria

• Inclusion Criteria:
• • 1. Age ≥ 18 years. 2. Clinical diagnosis of retinitis pigmentosa (RP). 3. Bilateral cataract meeting the indications for IOL implantation. 4. Willingness to participate in the study and provision of signed informed consent.
• Exclusion Criteria:
• • - 1. History of intraocular surgery. 2. Severe zonular weakness (e.g., zonular dialysis \>90°, lens subluxation/dislocation) 3. Other ocular comorbidity: such as pseudoexfoliation syndrome, ocular trauma, corneal dystrophies, uveitis, etc.
• • 4. Severe systemic diseases: such as severe hypertension, diabetes, heart disease, Alzheimer's, Parkinson, etc.