Corneal topography for pancorneal toric edge rigid gas-permeable contact lens fitting in patients with keratoconus,and differences in age and gender |
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| Affiliation: | 1. Department of Ophthalmology, Erasmus Medical Center, Rotterdam, The Netherlands;2. Department of Epidemiology, Erasmus Medical Center, Rotterdam, The Netherlands;3. Department of Ophthalmology, Leiden University Medical Center, Leiden, The Netherlands;4. Department of Ophthalmology, HagaZiekenhuis (Haga Hospital), The Hague, The Netherlands;1. University of Ulster, School of Biomedical Sciences, Coleraine, UK;2. Midland Eye Institute, Solihull, West Midlands, UK;3. Royal Centre for Defence Medicine, University Hospital, Birmingham, UK;4. Birmingham and Midland Eye Centre, Birmingham, UK;5. North London School of Ophthalmology, Queens Hospital, Essex Barking, Havering & Redbridge University Hospitals NHS Trust, UK;6. NIDEK Co. Ltd., Wendelstein, Germany;1. Cornea and Laser Eye Institute–Hersh Vision Group, CLEI Center for Keratoconus, Teaneck, New Jersey;2. Department of Ophthalmology, Rutgers Medical School, Newark, New Jersey;3. Stulting Research Center at Woolfson Eye Institute, Atlanta, Georgia;4. Avedro Inc., Waltham, Massachusetts;5. Durrie Vision, Overland Park, Kansas;6. See Clearly Vision Group, Mclean, Virginia;1. Retina Research Centre, Mashhad University of Medical Sciences, Mashhad, Iran;2. Refractive Error Research Centre, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran;3. Department of Optometry, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran;4. Computer Engineering Department, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran;5. Department of Social Medicine, Mashhad University of Medical Sciences, Mashhad, Iran;1. Dublin Institute of Technology, Ireland;2. Plymouth University, United Kingdom |
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| Abstract: | PurposeTo determine whether pancorneal rigid gas-permeable toric edge contact lenses (pancorneal RGP-CL) fitting could be improved by using non-central corneal shape predictors, and to compare these parameters with respect to age and gender in patients with keratoconus.MethodsThe current study was a retrospective study including patients with clinically evident keratoconus (on videokeratography) from three medical centres located in the Netherlands. Medical history, visual acuity, refraction, and contact lens characteristics were documented. All participants underwent ophthalmic examination including measurement of K-values (steepest, flattest, mean, as a non-central parameter the minimum radius [K-minimum], and all combined) using corneal topography. Fitting of contact lenses was based on the fluorescence pattern as seen during slitlamp examination.ResultsA total of 378 eyes of 218 patients with keratoconus were included. Of these, 257 (68%) were fitted with a pancorneal RGP-CL. The central K-values, K-steep and K-flat, performed well in predicting the base curve radius, though, for pancorneal RGP-CL the non-central K-minimum added most (35.5%) to the total explained variance in base curve radius. Regarding age and gender, women tended to have larger K-values than men. No differences in K-values were found with respect to age.DiscussionWe found that including the K-minimum as a non-central parameter may improve prediction of the best base curve radius for pancorneal RGP-CL and may reduce the number of trial contact lenses. In line with other studies, suggestive evidence was found for a difference in pattern of progression of keratoconus with gender, but not with age. |
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| Keywords: | Keratoconus Pancorneal toric edge rigid gas-permeable contact lenses Keratometry Base curve radius |
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