WaveLight® Contoura topography-guided planning: contribution of anterior corneal higher-order aberrations and posterior corneal astigmatism to manifest refractive astigmatism

• Main Authors: Wallerstein A, Gauvin M, Cohen M
• Format: Article
• Language: English
• Published: Dove Medical Press 2018-08-01
• Series: Clinical Ophthalmology
• Subjects: Contoura; Corneal higher-order aberrations; Anterior Corneal Astigmatism; Posterior Corneal Astigmatism; Refractive Astigmatism
• Online Access: https://www.dovepress.com/wavelightreg-contoura-topography-guided-planning-contribution-of-anter-peer-reviewed-article-OPTH

Avi Wallerstein,1,2 Mathieu Gauvin,1,2 Mark Cohen2,3 1Department of Ophthalmology, Faculty of Medicine, McGill University, Montreal, QC, Canada; 2LASIK MD, Montreal, QC, Canada; 3Department of Surgery, Faculty of Medicine and Health Sciences, University of Sherbrooke, Sherbrooke, QC, CanadaClinical refractive astigmatism (RA) and topography-measured anterior corneal astigmatism (ACA) are rarely identical in magnitude and axis.1 This difference, when expressed vectorially, is termed ocular residual astigmatism (ORA).1 What accounts for this difference remains a topic that needs further research, and has implications as to what refraction to treat with topography-guided excimer laser ablations in order to maximize outcomes.1 This research letter investigates aspects of two contributing factors: posterior corneal astigmatism (PCA) and anterior corneal higher-order aberrations (CHOAs).