Pattern Visual Evoked Potentials in Dyslexic Children

Overview

Journal J Ophthalmic Vis Res

Specialty Ophthalmology

Date 2017 Nov 2

PMID 29090050

Citations 2

Authors

Javad Heravian Shandiz

Mohsen Heyrani

Davood Sobhani-Rad

Zeinab Salehinejad

Shirin Shojaei

Mohamad Javad Khoshsima

Abbas Azimi

Abbas Ali Yekta

Seyed Hosein Hoseini Yazdi

Affiliations

Soon will be listed here.

Abstract

Purpose: This study aimed to compare pattern visual evoked potential (PVEP) components in dyslexic and normal children.

Methods: This cross-sectional analytic study recruited 72 children, including 36 dyslexic and 36 normal participants aged 8-12 years. Visual examinations included measurement of distance visual acuity, refraction, and PVEP components of amplitudes and latencies with two different check sizes of 15 and 60 minutes (min) of arc at two contrast levels of 25% and 100%.

Results: Our results demonstrated significant differences between dyslexic and normal children in terms of P100 latency and amplitude of PVEP at 25% contrast, with check sizes of 15 and 60 min of arc. However, there were no significant differences between the two groups regarding P100 latency and amplitude at 100% contrast with check sizes of both 15 and 60 min of arc.

Conclusion: Dyslexic participants showed reduced amplitude and prolonged latency in most PVEP components at low-contrast levels. These findings may support the magnocellular deficit hypothesis in dyslexic participants, even though the parvocellular pathway remains intact.

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