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Vision screening programs often rely on acuity measures to detect significant refractive error and clinicians use measures of acuity to monitor refractive treatment. This study investigated the effects of induced astigmatism on visual acuity (VA) using several paediatric acuity tests: the Keeler LogMAR crowded and single letter acuity tests, the single letter Sheridan Gardiner chart, and the crowded and single Kay picture tests.

Six fully‐corrected emmetropic adults had induced astigmatic blur imposed at different axes of astigmatism (90°, 180°, 135°, 45°). Astigmatic errors ranged from 0.75 to 3.50 DC. Monocular VA was measured with induced astigmatic blur for each acuity test. Participants and examiner were masked to the axis and power of the astigmatism.

All participants demonstrated similar variability in performance across acuity charts (p = 0.54). For all charts, there was a linear …