Trial lenses show comparable rotation in astigmatic subjects, suggesting effective fitting for toric lenses.
Fifteen refractive astigmats were fitted with prism ballasted and truncated piano, spherical lenses and prescription toric soft lenses. The initial rotation observed with each lens type did not differ significantly, indicating that trial sets of such spherical lenses may provide an effective method of fitting toric soft lenses.
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Jurkus et al. (1979) studied this question.
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