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Optic nerve aplasia.

C E Margo¹, L M Hamed, E Fang

¹Department of Ophthalmology, University of Florida College of Medicine, Gainesville.

Archives of Ophthalmology (Chicago, Ill. : 1960)

|November 1, 1992

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Optic nerve aplasia, a rare congenital defect, was studied in a young girl. Findings suggest a primitive visual pathway organization with misdirected axons in unilateral cases.

Area of Science:

Ophthalmology
Neuroscience
Developmental Biology

Background:

Optic nerve aplasia is a rare congenital defect often linked to other ocular or systemic abnormalities.
Congenital ocular anomalies require thorough investigation to understand developmental pathways.

Observation:

A 3-year-old girl presented with monocular microphthalmos and optic nerve aplasia confirmed histopathologically.
Magnetic resonance imaging (MRI) revealed unilateral optic nerve aplasia, hemichiasmal hypoplasia, and bilateral optic tracts.

Findings:

Visually evoked cortical response (VECR) showed increased signals in the occipital cortex ipsilateral to the aplastic nerve.
This suggests axonal misrouting from the temporal retina of the normally developed eye.
The study observed a potential primitive neuronal organization in the visual pathway.

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Implications:

Unilateral optic nerve aplasia may involve an atypical retinogeniculostriate projection.
Understanding these aberrant pathways is crucial for diagnosing and managing congenital visual defects.
This case highlights the complex neurodevelopmental alterations associated with optic nerve aplasia.