This is a self-controlled randomized clinical trial to investigate the effect of capsular tension ring (CTR) implantation on intraocular lens (IOL) position in cataract patients with retinitis pigmentosa(RP). Each patient will receive CTR implantation in one eye, with the fellow eye serving as control. Postoperative outcomes, including visual acuity, IOL position, and postoperative complications will be compared between eyes.
Age ≥ 18 years.
Clinical diagnosis of retinitis pigmentosa (RP).
Bilateral cataract meeting the indications for IOL implantation.
Willingness to participate in the study and provision of signed informed consent.
History of intraocular surgery.
Severe zonular weakness (e.g., zonular dialysis >90°, lens subluxation/dislocation)
Other ocular comorbidity: such as pseudoexfoliation syndrome, ocular trauma, corneal dystrophies, uveitis, etc.
Severe systemic diseases: such as severe hypertension, diabetes, heart disease, Alzheimer's, Parkinson, etc.
Parallel
CTR implantation
Procedure/SurgeryDevice: CTR (275001G, OPHTEC BV, Netherlands) All patients undergo uneventful phacoemulsification by a 2.2 mm temporal transparent corneal incision using Centurion Vision System (Alcon Laboratories, Fort Worth, TX, USA). After the nucleus and cortex are removed, a capsular tension ring is implanted in the capsular bag and then IOL (J\&J Tecnis DCB00) is implanted.
IOL dencentration
Measured by anterior segment OCT (CASIA2)
IOL dencentration
Measured by anterior segment OCT (CASIA2)
IOL tilt
Measured by anterior segment OCT (CASIA2)
BCVA
BCVA is evaluated with ETDRS visual acuity chart.
Postoperative complications
Postoperative complications such as posterior capsular opacification, anterior capsule contraction, cystoid macular edema are examined by slit lamp photograph and other devices if necessary.
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