amaurosis

Concise Oxford English Dictionary © 2008 Oxford University Press:
amaurosis /ˌamɔːˈrəʊsɪs/

▶noun Medicine partial or total blindness without visible change in the eye, typically due to disease of the optic nerve, spinal cord, or brain.

– derivatives
amaurotic adjective.

– origin C17: from Gk amaurōsis, from amauroun ‘darken’, from amauros ‘dim’.