Topography Guided Photorefractive Keratectomy With Collagen Cross Linking For Post Lasik Ectasia
Published 2022
- 40th Congress of the ESCRS
Reference: PP09.02
| Type: ESCRS 2022 - Posters
| DOI:
10.82333/j76n-7404
Authors:
Amir Ismail* 1
, Niraj Mandal 1
, Geoffrey Ching 1
, David Lin 1
, Greg Moloney 1
, Simon Holland 1
1Department of Ophthalmology and Visual Sciences,University of British Columbia, Vancouver, Canada,Vancouver,Canada
Purpose
Ectasia is a rare yet serious complication of LASIK surgery involving progressive asymmetric thinning and steepening of the cornea due to biomechanical instability of the stroma. Collagen cross linking (CXL) in combination with topography-guided photorefractive keratectomy (TG-PRK) have been proposed as a promising intervention to address both the structural and refractive abnormalities of ectasia simultaneously.
Setting
Laser clinic in Vancouver
Methods
This study is a retrospective case series of Fifty-two eyes of 42 patients patients who underwent TG-PRK with Athens Protocol modified CXL for post-LASIK ectasia, over a period of 12 months.
Results
The mean UDVA improved from 0.38 ± 0.06 logMAR preoperatively to 0.28 ± 0.03 logMAR at final follow up. Mean astigmatism improved from 2.9 ± 0.18 D to 1.3 ± 0.18 D. Preoperatively, the mean K central value was 42.77 ± 0.68 D. This value fell to 40.97 ± 0.53 D at the final postoperative visit. Qualitatively, 71% of eyes had astigmatism greater than 2 D preoperatively, and 50% of eyes had astigmatism greater than 3 D at the same visit. This figure decreased to 38% and 19% respectively at the intermediate followup, and to 21% and 10% respectively at the final followup.
Conclusions
TG PRK with cross linking is a promising tool to address both the structural and refractive abnormalities of patients with post LASIK Ectasia.