In optic atrophy, the optic disc is appears to pale is index of: (A) Atrophy of the nerve fibre, (B) Loss of vasculature, (C) Gliosis, (D) All of the above
Answer is B. (Loss of vasculature) (302-Khurana 4th)OPTIC ATROPHY* Ophthalmic features of optic atrophy is generally are pallor of the disc and decrease in the number of small blood vessels (Kastenbaum index)* The pallor is not due to atrophy of the nerve fibres but to loss of vasculature