Performance and predictability of a new large diameter contact lens design in keratoconic corneae |
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| Affiliation: | 1. Selcuk University Faculty of Medicine, Department of Opthalmology, Konya, Turkey;2. Midyat State Hospital, Department of Ophthalmology, Mardin, Turkey;3. Sutcu Imam University Faculty of Medicine, Department of Obstetric and Gynecology, Kahramanmaras, Turkey;4. Sutcu Imam University Faculty of Medicine, Department of Opthalmology, Kahramanmaras, Turkey;5. Private American Hospital, Gaziantep, Turkey;1. Department of Polymers and Pigments, National Research Centre, Dokki, Cairo, Egypt;2. Department of Agricultural Microbiology, National Research Centre, Dokki, Cairo, Egypt;1. Eye Research Center, Tehran University of Medical Sciences, Tehran, Iran;2. Department of Optometry, Iran University of Medical Sciences, Tehran, Iran;3. Noor Research Center for Ophthalmic Epidemiology, Noor Eye Hospital, Tehran, Iran;4. Department of Optometry, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran;5. Department of Foreign Languages, Tehran University of Medical Sciences,Tehran, Iran;6. Refractive Errors Research Center, Mashhad University of Medical Sciences, Mashhad, Iran;7. Mashhad University of Medical Sciences, Mashhad, Iran;8. Department of Medical Surgical Nursing, School of Nursing and Midwifery, Shahid Beheshti University of Medical Sciences, Tehran, Iran |
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| Abstract: | ObjectivesTo evaluate the clinical performance and predictability using corneal topography in the fitting of a new large-diameter rigid gas permeable (RGP) contact lens design in eyes with keratoconus (KCN).MethodsThis study presents a review of eyes fitted with Alexa ES lenses for nonsurgical optimisation of visual correction. Anterior steep simulated keratometry (sim-K steep), corneal diameter (HVID), the Curvature at the apex in diopters (Cc), and distance from the corneal apex to the centre of the cornea (Lc) in millimetres derived from the Cone Location and Magnitude Index (CLMI) were recorded. Visual acuity, mean wearing time, final sagittal depth and adverse events were also recorded. Correlations between topographic indices and base curve were evaluated using the Pearson correlation coefficient.ResultsForty-six eyes from 26 patients (19 males/ 7 females) were included. Mean visual acuity improved from 0.49 ± 0.32 with glasses, to -0.02 ± 0.10 with the contact lens. The mean daily wear time was 12.19 ± 1.96 hours. No complications were detected in 95.65% of the eyes 95% CI (83.9%-99.2%)] but two episodes of non-infectious keratitis. The average sagittal depth of the lenses fitted was 0.425 ± 0.15 mm, and it was positively correlated with the Cc value (r² = 0.66, p< 0.0001, n=46) derived from the CLMI index of the pre-fitting topography.ConclusionsCorneoscleral RGP contact lenses are a safe, and effective alternative for managing KCN patients to corneal lenses. Also, clinical data derived from the corneal topography could be used to help to decide the first diagnostic lens to be assessed, easing the overall fitting process. |
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| Keywords: | Corneoscleral contact lenses Keratoconus Alexa ES contact lens Contact lens fitting Corneal topography Scleral contact lenses |
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