Table 1.

Classification of 31 clinical cases with retrograde degeneration

Location	Pathology	Number of cases
Pre‐chiasmal unilateral optic neuritis/atrophy	Multiple sclerosis/Divic's disease Trauma Unknown	4 3 5
Chiasmal	Confirmed pituitary tumour Unconfirmed	1 3
Post‐chiasmal retrograde degeneration	Cardiovascular accident† Trauma Surgery Viral Unknown†	6 3 1 1 4

^† The retinal nerve fibre layer/ganglion cell thickness was above average in five patients (four cardiovascular accident patients and one with unknown pathology). While these patients had described asymmetry, the absolute measurements remained within normal limits.