ESCRS - FP27.10 - Safety And Efficacy Of Implantation Of A New Intrastromal Corneal Ring Segment To Correct Low To Moderate Myopia

Safety And Efficacy Of Implantation Of A New Intrastromal Corneal Ring Segment To Correct Low To Moderate Myopia

Published 2023 - 41st Congress of the ESCRS

Reference: FP27.10 | Type: Free paper | DOI: 10.82333/wyyr-te61

Authors: Sandro Coscarelli* 1 , Sandro P. Coscarelli 2 , Leonardo Torquetti 3

1Ennio Coscarelli Eye Clinic,Belo Horizonte,Brazil, 2Ennio Coscarelli Eye Clinic,Belo Horizonte,Brazil, 3Center for Excellence in Ophthalmology,Para de Minas,Brazil

Purpose

To evaluate the clinical outcomes after implantation of a new intrastromal corneal ring segment to correct low to moderate myopia (ICRS-HM) in patients with thin corneas or keratoconus suspects.

Setting

Ennio Coscarelli Eye Clinic - Brazil 

Methods

We evaluated 76 eyes of 47 patients that had ICRS-HM implantation. In 24 eyes, the ICRS implantation was followed by PRK. The mean age of patients was 29.1 ± 7.12 (range 18 to 40 years old). Uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), keratometry, spherical equivalent, pachymetry, and aberrometry were compared using ANOVA with repeated measurements assessed preoperatively and at the last follow-up visit after the procedures.

Results

The mean follow-up time after ICRS-HM implantation was 8.4 ± 2.2 [SD] months. The mean preoperative UDVA improved from 20/400 preoperative to 20/80 after ICRS and 20/30 after PRK. The mean preoperative CDVA was 20/25 (range from 20/40 to 20/20) and remained unchanged after ICRS-HM implantation. Following the PRK the mean CDVA was 20/25 (range from 20/40 to 20/20).
The mean spherical equivalent decreased from -4.50 ± 1.17 (range -2.50 to -6.00) preoperatively to -1.40 ± 1.38 (range Plano to -4.00) postoperatively (p<0.001) after ICRS-HM ICRS implantation and decreased to 0.14 ± 0.13 (range -1.50 to 0.75) postoperatively (p<0.001) after PRK. The change in CDVA and topographic astigmatism were statistically significant (P<0.0001).

Conclusions

ICRS-HM can efficiently and safely correct low to moderate myopia in patients with thin corneas or keratoconus suspects. In many cases, the ICRS implantation alone (without consecutive PRK) is enough for myopia correction.