RGP contact lens fitting in keratoconus using FITSCAN technology |
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| Affiliation: | 1. L V Prasad Eye Institute, Hyderabad, India;2. Bausch & Lomb School of Optometry, Kismathpur, Hyderabad, India;1. Division of Rheumatology, Department of Ophthalmology, Duke University, Durham, North Carolina;2. Division of Rheumatology, Duke University, Durham, North Carolina;3. pSivida, Watertown, Massachusetts;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. Department of Ophthalmology and Visual Science, Washington University, St. Louis, Missouri;2. Department of Ophthalmology, University of Washington, Seattle, Washington;3. Department of Biological Structure, University of Washington, Seattle, Washington;4. Department of Pathology, University of Washington, Seattle, Washington;5. The Retina Service of Wills Eye Hospital, MidAtlantic Retina, Philadelphia, Pennsylvania;1. Instituto de Oftalmología y Ciencias Visuales - TecSalud. Tecnológico de Monterrey, Monterrey, México;2. Catedra de Oftalmología y Ciencias Visuales. Escuela de Medicina y Ciencias de la Salud, Tecnológico de Monterrey, Monterrey, México;3. Escuela de Medicina y Ciencias de la Salud, Tecnológico de Monterrey, Monterrey, México;1. Texas Eye Research and Technology Center, University of Houston, College of Optometry, 4901 Calhoun Rd, Houston, TX, United States;2. University of the Incarnate Word, Rosenberg School of Optometry, San Antonio, TX, United States |
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| Abstract: | PurposeTo assess and compare the base curve (BC) of rigid gas permeable contact lens (RGP) that were calculated by FITSCAN using corneal topography (Orbscan IIz) and the diagnostic contact lens fitting method in keratoconus eyes.Materials and methodsA prospective comparative study of 85 keratoconus eyes was conducted. Two masked observers calculated the contact lens parameters of RGP lens by diagnostic fitting method and using FITSCAN technology. The base curves calculated by two methods were compared using Wilcoxon signed rank test and agreement between two methods were analysed using Bland–Altman plot.ResultsEighty-five eyes from 55 keratoconus patients were included in the study. The mean age was 17.63 ± 2.78 (range: 12–23) years and among them 46 were males. The keratoconus was graded into mild, moderate and severe based on average keratometry values. The base curve calculated by the FITSCAN is on average 0.22 mm higher than that calculated by diagnostic method (P value <0.0001, 95% CI = 0.155, 0.245, Wilcoxon signed rank test) and the bias between the two methods was found to be 2.7% (Bland–Altman plot), indicating systematic bias between the two modalities. By single linear regression analysis, the base curve of RGP contact lens could calculated by using the formula, base curve (BC) = (FITSCAN calculated BC × 0.86563) + 0.78738.ConclusionOur study showed that selecting the BC of the initial trial lens 0.22 mm steeper than the FITSCAN calculated base curve, may help to reduce the complexity of RGP contact lens fitting in keratoconus. |
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