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ORIGINAL ARTICLE
Year : 2015  |  Volume : 7  |  Issue : 2  |  Page : 48-52

Corrected visual functions in keratoconus patients with rigid gas-permeable contact lens and its association with cone location


1 Department of Contact Lenses, Faculty of Optometry and Visual Science, Al-Neelain University, Khartoum, Sudan; Program of Optometry, School of Healthcare Sciences, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
2 Program of Optometry, School of Healthcare Sciences, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Kuala Lumpur, Malaysia
3 Program of Optometry, School of Healthcare Sciences, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Kuala Lumpur; Department of Optometry, Faculty of Health Sciences, Universiti Teknologi MARA, Selangor Darul Ehsan, Malaysia
4 Department of Ophthalmology, Faculty of Medicine, Al-Neelain University, Khartoum, Sudan

Correspondence Address:
Mustafa Abdu
Faculty of Optometry and Visual Science, Al-Neelain University, Khartoum, Sudan

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DOI: 10.4103/1858-540X.169436

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Objective: To compare corrected visual functions between spectacles and rigid gas permeable (RGP) lenses, and to evaluate the association of cone location with corrected visual functions with RGP lenses in keratoconus patients. Materials and Methods: Thirty-four eyes from 19 newly diagnosed keratoconus patients were included. All subjects were fitted with hyper Dk (160) RGP lenses. All subjects were divided into two groups following their corneal cone location (central and paracentral). Manifest refraction, best spectacle visual acuity (BSVA) and visual acuity (VA) with an RGP contact lens (RGPVA) using Snellen chart, best spectacle contrast sensitivity (BSCS) and CS with RGP (RGPCS) using Pelli-Robson chart, slit lamp, and topography measurements were conducted. Results: A mean age of all subjects was 26.63 ± 8.58 years. Sixteen eyes (47.1%) have central cones, and 18 eyes (52.9%) have paracentral cones. At baseline, mean refraction was −5.62 ± 3.62 D, mean CA was −6.74 ± 4.75 D, mean best spectacle-corrected VA (BSCVA) was 0.59 ± 0.33, and mean BSCS was 1.54 ± 0.33. Visual functions improved significantly with contact lens wear (P < 0.05). No significant difference was detected between both groups in keratometer readings, mean CA, BSVA, RGPVA, BSCS, and RGPCS (P > 0.05). A significant relation was noted between the mean K and BSCVA, BSCS, RGPCS (P < 0.05), but the insignificant relation was detected between mean K and RGPVA (P > 0.05). No association was found between the cone location and RGPVA or RGPCS (P > 0.05). Conclusion: RGP contact lens is significantly improving visual functions of keratoconus patients. Cone location in keratoconic eyes has no effect on corrected VA or CS and therefore, is not a factor in trial contact lens selection.


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