Maximum human objectively measured pharmacologically stimulated accommodative amplitude

Grzybowski, Andrzej and Schachar, Ronald A. and Gaca-Wysocka, Magdalena and Schachar, Ira H. and Pierscionek, Barbara K. (2018) Maximum human objectively measured pharmacologically stimulated accommodative amplitude. Clinical Ophthalmology, 12. pp. 201-205. ISSN 1177-5483

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Official URL: https://doi.org/10.2147/OPTH.S154432

Abstract

Purpose: To measure the maximum, objectively measured, accommodative amplitude, produced by pharmacologic stimulation. Methods: Thirty-seven healthy subjects were enrolled, with a mean age of 20.2±1.1 years, corrected visual acuity of 20/20, and mean spherical equivalent refraction (SER) =–0.83±1.60 diopters. For each subject, the right pupil was dilated with phenylephrine 10%. After 30 minutes, the pupil was measured, the left eye was patched, and the right eye was autorefracted. Pilocarpine 4% was then instilled in the right eye, followed by phenylephrine. At 45 minutes after the pilocarpine, autorefraction and pupil size were again measured. Results: Mean pupil size pre- and postpilocarpine was 8.0±0.8 mm and 4.4±1.9 mm, respectively. Pre- and postpilocarpine, the mean SER was –0.83±1.60 and –10.55±4.26 diopters, respectively. The mean pilocarpine-induced accommodative amplitude was 9.73±3.64 diopters. Five subjects had accommodative amplitudes ≥14.00 diopters. Accommodative amplitude was not significantly related to baseline SER (p-value =0.24), pre- or postpilocarpine pupil size (p-values =0.13 and 0.74), or change in pupil size (p-value =0.37). Iris color did not statistically significantly affect accommodative amplitude (p-value =0.83). Conclusion: Following topically applied pilocarpine, the induced objectively measured accommodation in the young eye is greater than or equal to the reported subjectively measured voluntary maximum accommodative amplitude.

Item Type: Journal Article
Keywords: maximum, accommodative amplitude, objective, pilocarpine
Faculty: ARCHIVED Faculty of Health, Social Care & Education (until September 2018)
Depositing User: Lisa Blanshard
Date Deposited: 18 Feb 2021 13:36
Last Modified: 09 Sep 2021 18:57
URI: https://arro.anglia.ac.uk/id/eprint/706286

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