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Static accommodation to filtered polychromatic stimuli

Poster Details

First Author: R. Montes SPAIN

Co Author(s):    J. Esteve-Taboada   A. del Águila-Carrasco   T. Ferrer-Blasco   A. Domínguez           

Abstract Details

Purpose:

To study whether there are significant differences in the accommodative response (AR) of healthy young subjects when they fixate polychromatic targets with different spatial frequencies content.

Setting:

University of Valencia, Spain

Methods:

The AR of 6 young healthy subjects was measured using a Shack-Hartmann wavefront sensor. Two different accommodative demands or vergences were considered for this experiment: 2 and 4 Diopters (D). Also, three targets were used in this study. All were based on a fragment of the Picasso’s Guernica. One was a fragment of the normal image, whereas the other two were low-pass filtered versions of the former. The targets were showed to the subjects using a polychromatic microdisplay and the vergences were set using a Badal system.

Results:

AR was calculated from the Zernike defocus and the data from all the subjects was averaged. The mean AR when the vergence was set at 2 D was 1.16 ± 0.08, 1.16 ± 0.15 and 1.15 ± 0.10 D, for the normal image, the low-pass filtered image simulating a decimal visual acuity of 0.7 and for the low-pass filtered image simulating a decimal visual acuity of 0.5, respectively. For the same images, and a vergence of 4 D, the results were: 2.93 ± 0.15, 2.95 ± 0.17 and 2.89 ± 0.22 D.

Conclusions:

No statistically significant differences in the AR were found between the three different images (p > 0.05), therefore, low-pass filtered images does not seem to have a clear effect on the static accommodation of the eye when using polychromatic stimuli.

Financial Disclosure:

None

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