Effect of Capsular Tension Ring Implantation on Intraocular Lens Calculation Formula Selection for Long Axial Myopia

Abstract

Purpose The study investigated the effect of capsular tension ring (CTR) implantation on postoperative refractive stability and accuracy of intraocular lens (IOL) formulas for axial length (AL) ≥ 27.0 mm patients. Methods Prospective case series. The eyes of patients underwent phacoemulsification extraction combined with IOL implantation were classified as CTR implantation (A-CTR) and without CTR implantation (B-CON) groups. Refractive outcome and anterior chamber depth (ACD) were recorded at 1 week, 1 month, and 3 months post-operation. Prediction refractive error (PE) and absolute refractive error (AE) of each formula were calculated. Results Comparison of refraction at different postoperative times of the CTR group showed no statistical difference (all P > .05). The ACD in the A-CTR group gradually deepened, and that in the B-CON group gradually shallowed (all P > .05). The formulas’ AE showed statistically significant differences in CTR and CON groups (P < .001). The PE of Hill-RBF 2.0 and EVO formulas in the A-CTR group were more hyperopic than that in the B-CON group (all P > .05), the other five formulas were more myopic in A-CTR group than that in the B-CON group (all P > .05). Conclusion Patients with CTR implantation tended to have stable refraction at 1 week post-surgery and 1 month for those without it. CTR had no effect on the selection of formulas. Additionally, it is found that Kane and EVO formulas were more accurate for patients with AL ≥ 27.0 mm.