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Evaluation of the role of gas permeable scleral contact lenses
Author(s) -
Tromans Cindy,
Bullock John M.
Publication year - 1996
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1046/j.1475-1313.1996.96849830.x
Subject(s) - scleral lens , contact lens , aphakia , medicine , ophthalmology , lens (geology) , sclera , bandage , surgery , optometry , visual acuity , optics , physics
Purpose: To evaluate visual outcome and wearing times in eyes fitted with a gas permeable scleral contact lenses (GPSCL) and to assess the role of these lenses in therapeutic contact lens practice. Methods: The criteria for selection of eyes for GPSCL assessment were: 1. Previous PMMA scleral lens wearers with poor wearing times due to hypoxia. 2. Unsuccessful rigid gas permeable (RGP) corneal lens fitting. 3. Intolerance to RGP corneal lenses. 4. Ocular surface disease (bandage). Of 20 patients, 24 eyes with corneal ectasia, corneal grafts, aphakia and ocular surface disease were assessed for GPSCLs. The GPSCLs used were sealed, controlled clearance lenses produced by Innovative Sclerals, Hertford, UK. Results: Fitting was achieved in 21 of 24 eyes assessed. Of these, 66% achieved VA better than 6/9. All eyes achieved VAs better than 6/18. Wearing times ranged from 6 to 16 hours with all previous PMMA scleral wearers reporting increased comfort and wearing time. Five patients (5 eyes) discontinued wear for reasons discussed. Conclusions: GPSCLs have a role in therapeutic contact lens fitting, especially in instances of highly irregular corneal topography where conventional corneal lens fitting has failed and in these cases a GPSCL is a realistic alternative to surgical intervention. Previous PMMA scleral lens wearers with hypoxic symptoms benefit from refitting with GPSCLs.