Fall that could lead to blindness? (8)
I believe the answer is:
cataract
I believe this is a double definition.
'fall' is the first definition.
(I've seen this before)
'that could lead to blindness' is the second definition.
(Other definitions for cataract that I've seen before include "that impairs vision" , "Fall of water or eye ailment" , "Falls" , "what may have a bad effect on the viewer" , "(Nile) waterfall" .)