Acta Scientific Medical Sciences (ASMS)(ISSN: 2582-0931)

Research Article Volume 5 Issue 6

Reading Dynamics of Exophoric Persons: A Study with Infrared Reflexion Oculography (IROG)

Elfriede Stangler-Zuschrott1* and Alex Salomon2

1University Clinic for Ophthalmology and Optometry Emer, Vienna, Austria
2Department for Ophthalmology and Optometry at Clinic Donaustadt, Vienna, Austria

*Corresponding Author: Elfriede Stangler-Zuschrott, Professor, University Clinic for Ophthalmology and Optometry Emer, Vienna, Austria.

Received: April 22, 2021; Published: May 14, 2021


  The reading traces of 32 patients aged on average 32 years were registered by a binocular simultaneous infrared reflexion oculography unit (IROG). Seven of them had exophoria but no complaints, while 13 exophorics suffered from asthenopia or the inability to work at the VDU. The patients were compared to 12 persons with normal binocular vision. The differences in reading speed between paper-printed texts and screen reading was statistically highly significant. Normal persons showed a retardation of 11%. Exophoric persons without complaints showed a delay of 23%; although they were the best readers, they lost too much time in overcorrecting their divergence, the result could even be a convergent position. Exophoric persons with complaints showed a retardation of only 9% when reading on the screen because they had remarkable difficulties even in reading paper-printed texts: moments of decompensation into squint, unilateral suppression, readings stops, and fatigue. In general, the screen intensifies preexisting defects. The orthoptic findings correlated with the degree of eye strain. The worst cases had the largest squint angle, the lowest fusion range, and the weakest convergence power

Keywords: Exophoria and Reading at the VDU; Binocularity and Reading Speed; The Quality of Paper-prints and Reading Speed; Micro Motility and Eye Strain; Infrared-reflection-oculography (IROG)


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Citation: Elfriede Stangler-Zuschrott and Alex Salomon. “Reading Dynamics of Exophoric Persons: A Study with Infrared Reflexion Oculography (IROG)”.Acta Scientific Medical Sciences 5.6 (2021): 52-58.


Copyright: © 2021 Elfriede Stangler-Zuschrott and Alex Salomon. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


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