Disorders that Obscure the Margin of the Optic Disk

13.3.1 Congenital Disorders that Obscure the Margin of the Optic Disk

There are normal variants of the optic disk in which the margin appears fully or partially blurred. Care should be taken to distinguish them from abnormal findings.

13.3.1.1 Oblique Entry of the Optic Nerve

Where the optic nerve exits the eye in an oblique and nasal direction

(Fig. 13.4), the nerve fibers on the nasal circumference will be elevated. The tightly compressed nasal nerve fibers will obscure the margin of the optic disk. Accordingly, temporal nerve fibers are stretched, and the neuroretinal rim cannot be clearly distinguished. Often an adjacent crescentic whitish area,

Fig. 13.4 Tightly compressed nasal nerve fibers cause slight elevation of the optic disk, and the margin of the disk is obscured.

m known as a temporal crescent, will be observed on the temporal side. This crescent is frequently seen in myopia and is referred to as a myopic crescent. It can also be circular.

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