The Role of Capsular Tension Rings in Intraocular Lens Stability in High Myopia Cataract Patients: A Prospective Self-Controlled Study

Launched by JIN YANG · Jun 29, 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 in place better for people with high myopia (very nearsighted eyes). Each participant will have cataract surgery in both eyes, but only one eye will receive the CTR. The other eye will have the regular surgery without the ring, allowing doctors to compare the results between the two eyes. The study will look at how well patients see after surgery, how stable the lens is inside the eye, and overall visual quality over six months.

People who might join this study are adults with cataracts in both eyes and high myopia, meaning their eyes are longer than usual (a specific measurement called axial length is 26 mm or more). They need to be healthy enough to have surgery in both eyes within a couple of weeks and able to attend follow-up visits. During the study, participants will have surgery performed by the same surgeon and will be checked several times after surgery to measure vision and lens position. This study aims to find out if adding the CTR can improve the safety and effectiveness of cataract surgery for people with very nearsighted eyes.

Gender

ALL

Eligibility criteria

• Inclusion Criteria:
• • 1. Age ≥ 18 years.
• • 2. Diagnosed with bilateral age-related cataracts and scheduled for phacoemulsification with IOL implantation in both eyes.
• • 3. High myopia in both eyes, defined as axial length (AL) ≥ 26.0 mm.
• • 4. No significant difference in axial length between the two eyes (e.g., interocular AL difference \< 1.0 mm).
• • 5. Willingness and ability to undergo bilateral surgery within a short interval (e.g., within 1-2 weeks).
• • 6. Able to provide informed consent and comply with the study protocol and follow-up visits.
• Exclusion Criteria:
• • 1. History of ocular trauma, surgery, or intraocular inflammation in either eye.
• • 2. Presence of other ocular diseases that may affect visual outcomes, such as glaucoma, diabetic retinopathy, macular degeneration, or corneal opacity.
• • 3. Evidence of zonular weakness, pseudoexfoliation, or significant phacodonesis preoperatively.
• • 4. Severe dry eye or poor fixation that may interfere with postoperative imaging.
• • 5. Systemic diseases affecting visual function (e.g., uncontrolled diabetes, neurologic disorders).
• • 6. Participation in other clinical trials that may affect the study outcomes.