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  • Title: Rotational characteristics and stability of soft toric lenses.
    Author: Castellano CF, Myers RI, Becherer PD, Walter DE.
    Journal: J Am Optom Assoc; 1990 Mar; 61(3):167-70. PubMed ID: 2335702.
    Abstract:
    Toric soft contact lenses of a double slab-off design were fitted to 72 patients (128 days) with varying refractive requirements. Rotational characteristics and lens stability were studied as related to sphere power, cylinder power, and axis orientation. The patients were followed over a 1-month period. Although rotation of all lenses was skewed nasally, the total number of all lenses showing no rotation or temporal was somewhat greater than those with nasal rotation. In addition lenses of oblique axis displayed the least amount of rotational instability. Finally this study suggests some differences when comparing the rotational characteristics between with-the-rule and against-the-rule astigmatism correction, low vs. high myopia, and myopia vs. hyperopia.
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