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Assessment of visual field in myopia by multifocal visual evoked potential

Poster Details

First Author: A.Saeed EGYPT

Co Author(s):    S. Saleh   M. AbdlKader           

Abstract Details

Purpose:

To determine how the magnitude of myopia influences the visual field as measured by multifocal visual evoked potential (M-VEP).

Setting:

Ophthalmology Departments, Mansoura University and Benha University Hospitals, Egypt.

Methods:

The study included 180 eyes of normal and myopic volunteers with best corrected visual acuity (BCVA) of 6/6 or better. The subjects were divided into four groups: emmetropia with refractive error of ±0.25diopter (D), low myopia of -0.25D to -4.00D, moderate myopia of-4.25D to -8.00D, and high myopia of >-8.00D (45, 44, 48, 43 eyes , respectively). All subjects were tested by M-VEP to determine positive peak wave (p) amplitude and latency, and by static automated perimetry (SAP) to determine mean deviation (MD) and corrected pattern standard deviation (CPSD).

Results:

In high myopic group 4, there were statistically significant correlations between mean M-VEP amplitude and both spherical equivalent for myopia (R=0.52, P=0.001), and with MD of SAP (R=0.6, P=0.00). M-VEP latencies showed prolongations only in group 4 (not significant). While M-VEP P wave amplitude and latency in mild and moderate myopia were similar to emmetropia.

Conclusions:

High myopia could alter the visual field obtained by M-VEP , while low and moderate myopia do not alter the M-VEP parameters.

Financial Disclosure:

NONE

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