Bitoric rigid contact lens with prism fitting in rare cases of moderate corneal and residual astigmatism.
We reviewed all records of bitoric rigid gas permeable (RGP) contact lenses with prism ballast fittings performed at Tulane University Hospital and affiliated clinics from 1985 to 1993. We found eight eyes of six patients fit were fit with this lens, which is indicated for the patient with a moderately astigmatic cornea in addition to residual refractive astigmatism. In this design, a small amount of prism is added to a standard bitoric design to achieve rotational stability. All patients achieved 20/25 or better vision. We provide an outline for fitting bitoric RGP contact lenses with prism ballast.
Department of Ophthalmology, Tulane University School of Medicine, New Orleans, Louisiana 70112.
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D000328:Adult; D001251:Astigmatism / Q000628:therapy*; D003261:Contact Lenses; D003316:Corneal Diseases / Q000628:therapy*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D017755:Prosthesis Fitting; D014792:Visual Acuity