Abstract
The clinical utility of ophthalmic pilocarpine-induced pupil constriction to help overcome image blur of close-up targets in patients with failing accommodation is examined.Pilocarpine in low-concentration ophthalmic solution eye drops constricts the pupil to approximately 2 mm and thus reduces defocus blur. To gain regulatory approval of this drug for the treatment of presbyopia, clinical trials were conducted with 1.25% pilocarpine. Near vision was improved in a modest proportion of early presbyopes: between 12 and 22% more patients reached criterion near visual acuity than with a placebo, depending on conditions. The drug is well tolerated, and its effect has onset of only minutes and lasts several hours. Small pupils will cause diminished night vision and may have an impact on distance acuity to which possible minor drug-induced accommodative spasms could contribute. The therapy has a role for patients who want to postpone or briefly pause dioptric supplementation of their failing accommodation. No convincing case has been made for one version of ophthalmic pilocarpine over another.
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