Possible Clues:

• Do a cart wheel before and fall
• (Nile) waterfall
• Fall as result of eye problem
• A heavy downpour - that's one in the eye!
• Big flow of water about needing a sailor to do something
• First to commend a pamphlet about a medical condition affecting sight
• Falls
• Fall that could lead to blindness?
• Eye problem in pet, a rat keeping cold
• Eye complaint