THE EFFECT OF PHENYLEPHRINE ON THE ACCOMMODATIVE PROCESS IN MAN

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Abstract
Accommodation was measured in a double-blind study on 10 healthy volunteers (22-29 yr) before and after the instillation of 0.1%, 1.0% and 10% phenylephrine eye drops. Accomodation decreased exponentially with increasing concentration, reaching an average of 3 dioptres after 1 drop of 10% phenylephrine. The effect of adding phenylephrine to an atropinized eye was studied in 20 children (3-6 years). The children were randomized to placebo or phenylephrine treatment. The cycloplegic effect of atropine was unchanged in 8 out of 9 placebo-treated children, whereas 5 out of 11 phenylephrine-treated children showed a slight, but not significant, increase in hypermetropia.

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