Contralateral Eye Study of Topography Guided versus Q Value Adjusted Photorefractive Keratectomy in Myopia and Myopic Astigmatism

• Published in: Clinical ophthalmology (Auckland, N.Z.) N.Z.), 2021-01, Vol.15, p.1735-1749
• Main Authors: Gad, Rania E, Hosny, Mohamed, Ahmed, Rania A, Sherif, Ahmed M, Salah Eldin, Yehia
• Format: Article
• Language: English
• Subjects: Ablation; Ablation (Surgery); Age; Astigmatism; Coma; Cornea; Medical research; Medicine, Experimental; Myopia; Original Research; Patients; Photorefractive keratectomy; q value; Software; Tomography; Topography
• ISSN: 1177-5467; 1177-5483; 1177-5483
• DOI: 10.2147/OPTH.S300232

To compare visual outcome, higher order aberrations (HOAs) of topography guided and Q value adjusted ablation in the fellow eye of patients undergoing photorefractive keratectomy (PRK) for the correction of myopia and myopic astigmatism. Prospective randomized controlled interventional clinical study. The eyes of 52 patients undergoing PRK for myopia and astigmatism were included, that is, 104 eyes in total. In each patient, eyes were randomly allocated to group I: one eye received topography guided PRK using Contoura ablation software, or group II: the other eye received Q value adjusted PRK using Custom Q ablation software. Six months. At the end of 6 months, LogMAR UDVA was -0.04 ± 0.12 and -0.05 ± 0.11 (p = 0.688), while LogMAR CDVA was -0.06 ± 0.09 and -0.06 ± 0.1 in group I and group II, respectively (p = 0.972). Both groups showed a progressive oblate shift with time. This oblate shift was insignificantly less in group I by Topolyzer at 6mm, 15° and 30° at 6 months (p = 0.102, p = 0.138, p = 0.245, respectively). Topolyzer identified a significant difference between the change in coma and trefoil in both groups at 6 months (p