Optic Nerve

Although direct contusion of the nerve itself is rare, optic nerve evulsion or

TON may be caused by blunt force impacting the eye/orbit (Fig. 2.10.1). Table 2.10.3 shows data on contusion-related trauma from the USEIR.

Fig. 2.10.1 Fresh optic nerve evulsion. The typical appearance is the complete loss of the normal optic disc image, loss of retinal blood circulation, and the presence of a few hemorrhages. The injury was caused during basketball by another player's finger accidentally entering the orbit. There was no other visible globe pathology. It is not known whether the pathomecha-nism of optic nerve evulsion was forward dislocation of the eye, which tore the optic nerve at its insertion into the globe, or the increased IOP "blew" the nerve out

Fig. 2.10.1 Fresh optic nerve evulsion. The typical appearance is the complete loss of the normal optic disc image, loss of retinal blood circulation, and the presence of a few hemorrhages. The injury was caused during basketball by another player's finger accidentally entering the orbit. There was no other visible globe pathology. It is not known whether the pathomecha-nism of optic nerve evulsion was forward dislocation of the eye, which tore the optic nerve at its insertion into the globe, or the increased IOP "blew" the nerve out

Table 2.10.3 Contusion-related eye injuries: selected data from the USEIR

Variable

Finding (%)

Place of injury

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