Fast Eye Movements and Slow Eye Movements in Congenital Neurosensorial Deaf Subjects as Assessed by 2D video-Oculography™
Journal Title: Ophthalmology Research: An International Journal - Year 2014, Vol 2, Issue 3
Abstract
Aims: There is evidence that the deprivation of a sensory system at early developmental stage may lead to a functional change of the remaining one(s). Even if this process has been widely studied, results are still controversial. In particular, the auditory system might affect the oculomotor control, since saccades or fast eye movements (FEMs) and slow eye movements (SEMs) are modulated by the cochleo-vestibular input. It follows that hearing impairment would affect the SEM and saccadic pattern. Therefore, in this study FEMs and SEMs have been evaluated in congenital deaf subjects in order to state whether early auditory deprivation has influence on the oculomotor function. Study Design: Case-control study. Place and Duration of Study: Sample: Department of Ophthalmology, University of Turin, duration of the study: 6 months. Methodology: 20 congenital deaf subjects (12 males, 8 females: age range 7-15 years) and 21 age-matched normal hearing subjects (11 males, 10 females: age range 10-16 years) were recruited. Both groups, who had normal visual acuity, underwent SEM and FEM examination by means of 2D video-oculography. SEM left/right cycle gain and velocity and horizontal/vertical FEM latency, velocity and precision were analysed. Results were then compared in the two samples. Results: No substantial differences in SEM and FEM efficiency were found between deaf and normal hearing subjects. Conclusion: Auditory deprivation does not seem to lead neither to a compensatory enhancement nor to a worsening of the oculomotor function, in contrast to the improvement of peripheral spatial visual attention as reported in literature. We suggest fine ocular movements program, even though strictly influenced by cochleo-vestibular modulation, does not look to be linked to the auditory processing.
Authors and Affiliations
Carlo Aleci, Lorenzo Canavese
Keywords
Related Articles
- EP ID EP338974
- DOI 10.9734/OR/2014/8008
- Views 97
- Downloads 0
Is the ‘Visual Fields Easy’ Application a Useful Tool to Identify Visual Field Defects in Patients Who Have Suffered a Stroke?
Aims: To determine the level of agreement between the visual Fields easy application (VFE) for iPad and a standard clinical test for assessing peripheral vision in stroke survivors. Study Design: This was a prospective c...
Optical Coherence Tomography (OCT): Cataract or Pupil Size?
Purpose: To evaluate the impact that the pupil size and the crystalline lens opacification have on optical coherence tomography (OCT) accuracy and the necessity of pupil dilation for the examination of the nerve retinal...
Outcome of Visual Screening of Hospital Workers in University of Uyo Teaching Hospital, Uyo, South–South Nigeria
Background: The World Glaucoma Week (WGW) is a joint global initiative of the World Glaucoma Association (WGA) and the World Glaucoma Patients Association (WGPA) to raise awareness of glaucoma. As part of the celebration...
A New Method for Calculating Residual Astigmatism Produced by Toric Intraocular Lens Rotation
Aims: To report a new method for calculating residual astigmatism when exact and inexact cylinder power toric intraocular lenses (IOLs) are rotated. Methodology: Using Excel spreadsheets and sin2θ values, we expressed th...
Parinaud Syndrome in Association with Thalamic Infarct in a Young Person
Aim: We report a case of Parinaud syndrome secondary to an acute left posteromedial thalamic infarct in a young person. Presentation of Case: Patient's main presenting complaints were blurring of vision and diplopia. The...