Outcomes Of 320-Degree Intrastromal Corneal Ring Segment Implantation For Advanced Keratoconus

Published 2022 - 40th Congress of the ESCRS

Reference: PO310 | Type: ESCRS 2022 - Posters | DOI: 10.82333/3vha-rw32

Authors: Nan Ni Chen* ¹ , Chi Chin Sun ²

¹Ophthalmology,Chang Gung Memorial Hospital,Chiayi County,Taiwan, Province of China, ²Ophthalmology,Chang Gung Memorial Hospital,Keelung,Taiwan, Province of China;Colleges of Medicine,Chang Gung University,Taoyuan,Taiwan, Province of China

Purpose

The purpose of this study is to investigate visual and tomographic outcomes and complications of long-arc length intrastromal corneal ring segment implantation for treatment of advanced keratoconus.

Setting

A retrospective case series observational study.

Methods

This retrospective study enrolled 10 eyes of 9 subjects. All patients received 320-degree intrastromal corneal ring segment implantation with femtosecond laser assisted technique based on their advanced grading with pre-operative high keratometry (K) value, asphericity (Q) and astigmatism. Medical records and corneal tomography changes of consecutive patients were reviewed at baseline, 1 and 3 months after treatment.

Results

There are 6 female and 3 male patients with a mean age of 29.6±7.8 years in this study. Mean K reduced from 59.01±5.81 D preoperatively to 50.7±5.3 and 50.2±3.66 postoperatively (after 1 month and 3 months respectively, p < 0.001). The changes in mean K and steepest K were all statistically significant (P < 0.001). Mean uncorrected distance visual acuity (UDVA) improved from 20/400 to 20/200. Mean corrected distance visual acuity (CDVA) improved from 20/100 to 20/60. Both UDVA and CDVA showed a trend of improvement at post-operative month 3, though insignificant in CDVA (p = 0.114). Mean Q improved from -1.59±0.62 preoperatively to -0.48±1.08 and -0.11±1.04 postoperatively (p =0.016, 0.002). No postoperative complications were observed.

Conclusions

The present results suggest that implanting a 320-ICRS is a safe and effective procedure for treating patients with advanced keratoconus. Preoperative corneal thickness measurements and selection of types and thickness of ICRS are important to prevent unpredictable results.