International Journal of Physiology

  • Year: 2019
  • Volume: 7
  • Issue: 2

Effect of Visual Evoked Potential in Myopic Individuals

1Senior Assistant Professor, Department of Physiology, Chengalpattu Medical College, Chengalpattu

2II year MBBS, Department of Physiology, Chengalpattu Medical College, Chengalpattu

3Professor, Department of Physiology, Chengalpattu Medical College, Chengalpattu

4Associate Professor, Department of Physiology, Chengalpattu Medical College, Chengalpattu

Online published on 20 July, 2019.

Abstract

Visual evoked potentials (VEPs) are electrical potential differences recorded from the scalp in response to visual stimulus. Refractive errors blur the stimuli, causing defocus and tend to affect the VEP parameters [1]. Among the refractive errors, the incidence of myopia is increasing globally, due to the increased usage of illuminated electronic screens.

To study the changes in latency of VEP waves in myopic individuals and to compare them with normal healthy controls.

30 individuals with myopia in the age group 18–35 years were selected from Ophthalmology OPD and VEP was recorded in the Neurophysiology Lab, Chengalpattu Medical College and were compared with 30 age and gender matched healthy controls. The data was statistically analyzed with student independent unpaired ‘t’ test using SPSS 23.0 version.

As compared with controls the VEP latencies were significantly increased in myopic individuals (p<0.05).

Uncorrected myopia per se can cause prolongation of VEP latencies. So routine VEP recording should be done after correction of myopia to avoid false positive results.

Keywords

Refractive error, Myopia, Visual Evoked Potentials