Patients were allowed to wear the lenses for the maximum tolerable times daily; care and disinfection of the lenses were as advised by the manufacturers. ResultsThe computer results were based on a data analysis collected over one year and the significance of the results determined by x2 fraction P < oo05. The details are shown in Tables I to VI. Of the 151 patients 76 had had previous experience with hard lenses and five of that group wore hard lenses successfully with good daily tolerance. Forty-eight gave a clear history of allergy and 30 had allergies affecting the skin. Forty women out of io6 were taking the contraceptive pill, representing 37-7 per cent (Table I).

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