Evaluation of lens rotation differences between spherical nonprism and prism-ballast hydrogel contact lenses on toric corneas, suggesting better stability for prism designs.
Six subjects were fitted binocularly with both nonprism and prism‐ballast spherical Hydrocurve™ contact lenses to evaluate lens rotation on toric corneas. The 1 Δ and the 1 Δ lenses rotated significantly less than the equivalent nonprism lenses. For 11 of 12 eyes, V2 A was sufficient to stabilize the lens.
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Harris et al. (1977) studied this question.
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