27 y.o. man was in a combat firefight in Afghanistan.
â€¢ Hand-grenade fragments on face, to include right eye.
â€¢ Minimal light sensitivity OD.
a CT was performed in Afghanistan to determine treatment and mobilization.
Radiopaque fragments in right orbit near expected location of the optic nerve
Optic nerve avulsion
Fragment missed optic nerve, or did not sever
The globe was intact, however the patient still lost vision.
A grenade went off directly in front of him with fragments embedding into his face, to include his right eye.
Patient was airlifted to medical center for surgery where optic nerve damage was verified.
The second cranial nerve, responsible for the special sensation of sight, is the optic nerve. This is not really a "nerve", but is actually a post-synaptic
white-matter tract that connects the retinal ganglion cells to the occipital (visual) cortex, via the chiasm, lateral geniculate body, and the optic radiations.
The optic nerve is clinically tested by looking for reactivity to light, followed by testing of the visual fields - either at the bedside or using test equipment.
Both pupils should react (constrict) when light is shone in either eye.
Many diseases may affect the Optic nerve, including demyelination (Multiple Sclerosis), orbital inflammation (infection and non-infectious), and trauma.
Clinical Eye Exam Simulator:
- LINK -
Labled normal image: - LINK -
cow_pt.html :: find me