Predicting initial base curve of the rigid contact lenses according to Javal keratometry findings in patients with keratoconus |
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| Affiliation: | 1. Noor Research Center for Ophthalmic Epidemiology, Noor Eye Hospital, Tehran, Iran;2. Department of Optometry, School of Rehabilitation, Iran University of Medical Sciences, Tehran, Iran;3. Noor Ophthalmology Research Center, Noor Eye Hospital, Tehran, Iran;4. Department of Optometry, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran;5. Refractive Errors Research Center, Mashhad University of Medical Sciences, Mashhad, Iran;6. Department of Medical Surgical Nursing, School of Nursing and Midwifery, Shahid Beheshti University of Medical Sciences, Tehran, Iran;1. School of Optometry and Vision Science, University of New South Wales, Australia;2. Brien Holden Vision Institute, Sydney, Australia;3. School of Medical Sciences, University of Hyderabad, Hyderabad, Telangana, India;4. Brien Holden Eye Research Centre, L. V. Prasad Eye Institute, Hyderabad, Telangana, India;5. The Cornea Institute, L. V. Prasad Eye Institute, Hyderabad, Telangana, India;1. Department of Ophthalmology, Ghent University Hospital, Corneel Heymanslaan 10, Ghent, Belgium;2. Institute of Physical Chemistry, Polish Academy of Sciences, Jana Kazimierza 5, Warsaw, Poland;3. Faculty of Medical Sciences, University of Antwerp, Universiteitsplein 1, Antwerp, Belgium;4. Department of Ophthalmology, Antwerp University Hospital, Wilrijkstraat 10, Edegem, Belgium;5. Faculty of Medical Sciences, Ghent University, Sint-Pietersnieuwstraat 33, Ghent, Belgium;1. The Eye Center, Southern College of Optometry Memphis, 1245 Madison Avenue, Memphis, TN 38104, USA;2. Department of Vision & Hearing Sciences, Anglia Ruskin University, Cambridge, UK;3. Mark Wainwright Analytical Centre, University New South Wales, Sydney, Australia;4. Vision and Eye Research Unit, Anglia Ruskin University, Cambridge, UK;1. Bausch & Lomb Contact Lens Centre, L V Prasad Eye Institute, Road No. 2, Banjara Hills, Hyderabad, 500034, Telangana, India;2. Bausch and Lomb School of Optometry, Brien Holden Institute of Optometry and Vision Sciences, L V Prasad Eye Institute, Road No. 2, Banjara Hills, Hyderabad, 500034, Telangana, India;3. Prof. Brien Holden Eye Research Centre, Hyderabad Eye Research Foundation, L V Prasad Eye Institute, Road No. 2, Banjara Hills, Hyderabad, 500034, Telangana, India |
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| Abstract: | PurposeTo find an appropriate correlation between the base curve (BC) of rigid gas permeable (RGP) contact lenses and manual keratometry findings in Iranian patients with keratoconus (KCN) in order to simplify the fitting process, reduce the time, and lower the costs.MethodThis retrospective study was done in 121 eyes of 69 patients with KCN fitted with a specific trial set of RGP contact lenses over a 7-year period. The specifications of the final lens parameters included power, total diameter (1), and BC, the first two of which were fixed in all of the lenses in the trial set while BC was changed in 0.1-mm steps. Javal keratometer was used to measure keratometric values. The final fit assessment was performed based on the standard criterion of "three-point touch".ResultSingle and multiple linear correlations were done and the result was the following equation: BC = 2.455 (constant of the final multiple regression model) + 0.280 (steep keratometry) + 0.368 (flat keratometry) + 0.047 (corneal astigmatism)ConclusionThe advantages of this study include simplifying the RGP fitting process, reducing the examination time, lowering the costs, enhancing the confidence of the examiners and patients, easier lens fitting in remote places where more advanced devices are not accessible. |
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| Keywords: | Keratoconus Javal keratometry The flat curvature radius of keratometry Base curve RGP Contact lens fitting |
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