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Jaume Pujol, CARLES OTERO MOLINS, Mikel Aldaba, Silvia Lopez-Bausili, Fernando Díaz-Doutón, Fuensanta A Vera-Diaz; An automated accommodative facility test with unpredictable stimuli. Invest. Ophthalmol. Vis. Sci. 2018;59(9):2941.
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© ARVO (1962-2015); The Authors (2016-present)
To study the accommodative dynamics for predictable and unpredictable stimuli usingmanual and automated accommodative facility tests
Seventeen young healthy subjects (mean age 23 ± 2 years) were tested monocularly intwo consecutive sessions, using five different conditions in each session. Twoconditions replicated the conventional monocular accommodative facility tests for farand near distances, performed with manually held flippers. The other three conditionswere automated and conducted using an electro-optical system and open-fieldautorefractor. Two of the three automated conditions replicated the predictable manualaccommodative facility tests. The last automated condition was a hybrid approachusing a novel method whereby far and near accommodative facility tests wererandomly integrated into a single test of four unpredictable accommodative demands
The within-subject standard deviations for far and near distance were (±1,±1) cpm forthe manual flipper accommodative facility conditions and (±3, ±4) cpm for theautomated conditions. The 95% limits of agreement between the manual and theautomated conditions for far and near distances were poor: (-18, 12) and (-15, 3).During the hybrid unpredictable condition, the response time and accommodativeresponse parameters were significantly (p<0.05) larger for accommodation thandisaccommodation responses for high accommodative demands only. The responsetimes during the transitions 0.17/2.17 D and 0.50/4.50 D were not significantly differentbetween the hybrid unpredictable and the conventional predictable automated tests
The automated accommodative facility test does not agree well with the manual flippertest results, for either far or near distances. It is likely that operator delays in flipping thelens account for these differences. The novel hybrid test using an unpredictableaccommodation demand level provides a more comprehensive examination of theaccommodative dynamics than the conventional manual accommodative facility tests.Unexpectedly, the unpredictability of the stimulus did not to affect accommodationdynamics
This is an abstract that was submitted for the 2018 ARVO Annual Meeting, held in Honolulu, Hawaii, April 29 - May 3, 2018.
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