The head of the optic nerve can be visualized by a slit lamp with high plus or by using direct ophthalmoscopy .
On medical examination the head of the optic nerve can easily be visualised by a slit lamp with high plus or by using direct ophthalmoscopy ; however , frequently there is no abnormal appearance of the nerve head in optic neuritis ( in cases of retrobulbar optic neuritis ) , though it may be swollen in some patients ( anterior papillitis or more extensive optic neuritis ) .
Optic neuritis