Congenital Optic Nerve Head Abnormalities

Published on 10/05/2015 by admin

Filed under Opthalmology

Last modified 10/05/2015

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6.3

Congenital Optic Nerve Head Abnormalities

Several structural abnormalities of the optic nerve have been described on OCT scanning. All occur rarely.

Optic Disc Coloboma

Optic disc colobomas are uncommon congenital defects that develop as a result of defective closure of the fetal fissure (Fig. 6.3.1). Colobomas can be associated with peripapillary retinal detachments or schisis. In posterior segment colobomas, histological and OCT studies show that a tissue called the intercalary membrane overlies the area affected by the defect. OCT allows a qualitative assessment of the vitreous in eyes with optic disc colobomas, documenting the degree of vitreous condensation and adhesion in the area of the optic disc, especially with the three-dimensional reconstruction. OCT can potentially reveal retinal breaks on the optic disc margin. Retinal detachments and schisis associated with the optic disc colobomas can also be visualized on OCT scanning.

Optic Disc Pit

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