"anopsia" is blindness

Anu's example makes clear that the word can be used in the figurative sense, not just the strickly medical sense:

Odd then that with the proliferation of discourses surrounding the concept of "the postcolonial," so little attention should have been paid to a text ... There are, I think, three particular difficulties which may help account for that critical anopsia.

The metaphoric usage brings the word within tsuwm's wwftd preference for the "recondite word, especially one not falling into the following categories: medical terms ..."