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Assessment of the accommodation response over sustained near visual tasks with different electronic devices, using a Hartmann-Shack aberrometer

Poster Details

First Author: A.Moulakaki SPAIN

Co Author(s):    A. Recchioni   J. Esteve-Taboada   A. Del Aguila-Carrasco   R. Montes-Mico           

Abstract Details


To assess the accommodation response after extended reading periods, using a tablet and smartphone, as well as to determine potential differences in accommodation response at various stimulus vergences with a Hartmann-Shack aberrometer.


University of Valencia, Valencia, Spain


Eighteen healthy subjects with spherical ametropia in the range of ± 2.25 D, astigmatism less than 1 D, corrected visual acuity 20/25 or better and normal findings in an ophthalmic examination were enrolled. Accommodation responses were obtained, while the accommodation system of the eye was relaxed and visually stressed with an IPad mini and IPhone 4S for 10 min, at a distance of 0.25 m from subject’s eyes. Three measurements of accommodation response were monocularly acquired at the stimulus vergences from 0 to 4 D (with a step of 1 D), employing a Hartmann-Shack wavefront aberrometer (irx-3, Imagine Eyes).


No strongly significant change was found between the relaxed accommodative state and the visually stressed accommodative states, using an Ipad and Iphone 4S, subsequently. Observers showed a lag of accommodation for the accommodative demands from 1 to 4 D for all accommodative states. While, a slight lead of accommodation was presented for the accommodative demand of 0 D for all accommodative states. These outcomes were identified in comparison to the one-to-one ideal visual performance corresponding to each accommodative demand.


The data support the hypothesis that the difference between the ideal and real accommodation response is mainly attributed to the presence of the depth-of-field. The depth-of-field was dependent on the 3mm pupil size, selected in this study. The applied metric was independent of higher order aberrations, yielding a clear evaluation of the accommodative response for each accommodative state and demand. In the group of individuals was not detected any difference between the relaxed and both of visually stressed accommodative states. This was mainly associated with the young age and the level of the amplitude of accommodation of the subjects.

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