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Value of the ERG in congenital nystagmus
P A Good1, A E Searle, S Campbell
1Birmingham and Midland Eye Hospital.
Insights
Electroretinogram (ERG) testing is crucial for diagnosing vision issues in children with nystagmus. This study found a high incidence of congenital achromatopsia in such cases, highlighting the ERG
Area of Science:
- Ophthalmology
- Neuroscience
- Genetics
Background:
- Early onset nystagmus affects children's vision.
- Diagnostic challenges exist for visual impairments in pediatric populations.
Purpose of the Study:
- To investigate the utility of electroretinogram (ERG) and visual evoked potential (VEP) in diagnosing vision disorders in children with nystagmus.
- To determine the incidence of congenital achromatopsia in this cohort.
Main Methods:
- Retrospective analysis of 64 children with poor vision and early onset nystagmus.
- Electoretinogram (ERG) and visual evoked potential (VEP) testing.
- Color vision analysis was performed on 40 children.
Main Results:
- Congenital achromatopsia (rod monochromatism) was diagnosed in 17 children (29% incidence).
- Two cases of incomplete X-linked congenital achromatopsia were identified.
- ERG proved valuable for uncertain diagnoses, especially in early school-aged children.
Conclusions:
- ERG is essential for investigating children with nystagmus and associated visual deficits.
- Congenital achromatopsia is a significant finding in children presenting with nystagmus.
- Early diagnostic intervention using ERG can improve patient outcomes.
Abstract:
A group of 64 children with poor vision and early onset nystagmus were investigated retrospectively by the electroretinogram (ERG). Fifty-eight of these children also underwent analysis of the visual evoked potential (VEP), and 40 underwent colour vision analysis. Seventeen children were found to have complete congenital achromatopsia (rod monochromatism), being identified by their total colour blindness, reduced visual acuity, and reduced or absent photopic and flicker (30 Hz) ERGs. Two children with incomplete X-linked congenital achromatopsia were also found. This study identified the need to investigate children with nystagmus by means of the ERG and suggested that the ERG was useful where the diagnosis was uncertain, particularly at early school age. The incidence of congenital achromatopsia in a group of otherwise undiagnosed children with early onset nystagmus was high (29%), with 40% being classified as having congenital idiopathic nystagmus.