Evaluation and control of Durasoft lens rotation.

Fifteen subjects forming three groups of refractive astigmats (astigmation less than 1.00 D., astigmatism greater than or equal to 1.00 D and less than 2.00 D, and astigmatism greater than or equal to 2.00 D) were fitted with spherical DuraSoft lenses. Rotation was assessed from slit-lamp photographs taken after 30 min and after 4 hr of lens wear. The results show that incorporating either a prism or a single truncation alone into a spherical DuraSoft lens suffices as a method of stabilization, stabilization being effectively achieved with this lens in subjects with refractive astigmatism less than 2.00 D.