Abstract
The variation in comfort of 12 adapted rigid lens wearers was evaluated when they were fitted with Boston R?CD tricurve contact lenses of three different total diameters (9.0, 9.5, and 10.0 mm) and three different back optic zone radii (BOZR — 0.2 mm, Optimal BOZR, and BOZR + 0.2 mm). The subjects wore 12 pairs of lenses and each lens pair was worn for 1 hour, during which time the comfort of each lens was rated on an analog scale at 0, 15, 30, 45, and 60 minutes. The large-diameter lens (10 mm) was found to be significantly more comfortable than were the other two lens diameters ( p < 0. 02) and the steep-fitted lens was significantly less comfortable than were the optimum and flat-fitted lenses ( p < 0.01). When the time ratings were averaged, there was no significant difference in comfort over the 1 hour time interval for either diameter or back optic zone radius trials.
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