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Clinical electrophysiology and visual outcome in optic nerve hypoplasia (ONH)
  1. Daphne L McCulloch1,*,
  2. Pamela Garcia-Filion,2,
  3. Cassandra Fink2,
  4. Caroline A Chaplin1,
  5. Mark S Borchert3
  1. 1 Glasgow Caledonian University, United Kingdom;
  2. 2 Childrens Hospital Los Angeles & Keck School of Medicine, USC, United States;
  3. 3 Angeles & Keck School of Medicine, USC, United States
  1. Correspondence to: Daphne L McCulloch, Vision Sciences, Glasgow Caledonian University, 70 Cowcaddens Road, Glasgow, G4 0BA, United Kingdom; dlmc{at}gcal.ac.uk

Abstract

Aims: In optic nerve hypoplasia (ONH), the extent of functional loss of retinal ganglion cells cannot be determined by ophthalmoscopic examination. The prognostic value of visual electrodiagnostic tests in infants and toddlers with ONH was assessed by comparison with visual outcome.

Methods: 85 participants with ONH had ERG and VEP testing to flash and to pattern-reversal checks and ocular fundus photography prior to 36 months of age. These initial measures were compared with visual acuity outcomes at five years of age in the better-seeing eye.

Results: Visual outcomes ranged from normal to no light perception. Electrodiagnostic tests with prognostic value were: the amplitude of the flash VEP (Spearman’s rank correlations, p<0.001), the threshold category of stimulus (flash or check size) that elicited a VEP (p<0.001) and the amplitude of the N95 component of the pattern ERG (PERG) to 4-degree checks (p<0.02). Optic nerve size and co-existing pallor were also significant correlates. Stepwise regression analysis composed a best prediction model from VEP threshold category, optic nerve size, and optic disc pallor (F 3, 65; R2 = 58%; p<0.001).

Conclusions: Optic disk diameter, observation of disk pallor, VEP and PERG testing in infancy are useful for establishing the visual prognosis at five years of age in children with ONH. This is consistent with the notion that these parameters are related to the anatomic and functional preservation of retinal ganglion cells.

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