Waterfalls that can blur the eyes of the beholder? (9)
I believe the answer is:
cataracts
'waterfalls' is the definition.
('cataract' can be a synonym of 'waterfall')
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for cataracts that I've seen before include "Waterfalls and eye diseases" , "Eye afflictions produce waterfalls" , "Waterfalls in the eyes?" , "Eye problems causing blurred vision" , "Large waterfalls and eye defects" .)