Topography-Guided Photorefractive Keratectomy For Irregular Astigmatism After Radial Keratotomy Using A High-Speed Laser
Published 2024 - 42nd Congress of the ESCRS
Reference: PO1106 | Type: Poster | DOI: 10.82333/t8fe-kq57
Authors: Maheshver Shunmugam* 1 , Simon Holland 1 , Gregory Moloney 1 , David Lin 2 , Natalie Yang 1
1Ophthalmology,University of British Columbia,Vancouver,Canada, 2Pacific Laser Eye Centre,Vancouver,Canada
Purpose
To evaluate Topography-guided Photorefractive Keratectomy (TG-PRK) with Cross-Linking (CXL) for irregular astigmatism after Radial Keratotomy (RK) utilising the Schwind Amaris 1050 (SA).
Setting
Private surgical centre in Vancouver, Canada.
Methods
Retrospective cohort study evaluating 87 eyes that underwent TGPRK and CXL with Schwind Amaris 1050 excimer laser utilising the Athens protocol. Only those eyes with 12 months of follow-up were included.
Outcome measures included the preoperative and postoperative uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), manifest refraction, and topographic cylinder.
Results
Twenty-two eyes (25%) had an UDVA better than 20/40 on the Snellen chart 12 months post-operation.
Sixty-two eyes (71%) experienced improved CDVA of 1 line or more on Snellen chart in comparison to their pre-operative measurements at 12 months follow up. Of these eyes, 9 (10%) had gained ≥2 lines, while a single eye (1%) lost 2 or more lines.
Mean astigmatism was reduced from -2.44±1.89D to -0.98±0.85D.
The mean spherical equivalent improved from 2.03±2.32D to -0.51±1.84D.
Conclusions
Early results of TG-PRK with CXL using the SA show efficacy and safety in treating post-RK irregular astigmatism. The technique may be an alternative treatment for post-RK patients who have been unsuccessful with other methods of vision correction such as specialty contact lenses.