Analysis of Two Orthokeratology Lens Designs and Comparison of Their Optical Effects on the Cornea

Eye & Contact Lens
Rémy Marcotte-CollardLangis Michaud

Abstract

This study aims to analyze two commercial orthokeratology lens designs and compare their optical effects at the corneal level. This is a retrospective study on subjects seeking an orthokeratology fitting for myopia management at the Université de Montréal clinic between January 2013 and August 2015. Group A included the first 64 subjects fitted with a 4-curve lens design (Paragon CRT; Paragon) who met the inclusion criteria, whereas group B included the same number of subjects fitted with a 5-curve lens design (Dreamlens; Polymer Technology, Rochester, NY). Topographic tangential maps were collected at baseline and 3 months after fitting. The differential map was generated for each patient and analyzed, which involved determining the radius of the central distance zone (CDZ) and the power and width of the high convex zone (HCZ). Results were compared between the two groups, taking baseline refraction into account. Finally, a correlation was estimated between topographic data and corneal parameters (flat and steep K, the corneal eccentricity of each principal meridian). The CDZ for group A is significantly larger than the one generated for group B both horizontally (t(126)=12.12, P<0.01) and vertically (t(126)=15.690, P<0.01). H...Continue Reading

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Citations

Mar 1, 2019·Investigative Ophthalmology & Visual Science·Kate L GiffordPadmaja Sankaridurg
Nov 14, 2019·Graefe's Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Für Klinische Und Experimentelle Ophthalmologie·L BatresG Carracedo
Aug 31, 2019·Scientific Reports·Andrew K C LamDavid C C Lam
Jan 23, 2021·Journal of Clinical Medicine·Jaume PaunéAntonio Queirós
Apr 26, 2020·Contact Lens & Anterior Eye : the Journal of the British Contact Lens Association·Mark A Bullimore, Leah A Johnson
Mar 30, 2021·Contact Lens & Anterior Eye : the Journal of the British Contact Lens Association·Stephen J VincentLyndon Jones
May 16, 2021·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Biyue GuoPauline Cho

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