Stability of back-toric prism-ballast hydrogel contact lenses.
We fitted each of 20 eyes with 3 different Hydrocurve contact lenses: (1) spherical with prism ballast, (2) back-toric without prism ballast, and (3) back-toric with prism ballast. We monitored the stability of the lenses. The prism-ballast lenses were generally stable on corneas with zero to 3.5 DK of with-the-rule toricity; the back-toric nonprism lenses were not stable.
D000328:Adult; D003263:Contact Lenses, Hydrophilic / Q000592:standards*; D005260:Female; D006801:Humans; D008297:Male