Possible Clues:

• Fall that could lead to blindness
• American sailor in Arctic, having left Rhode Island, separately developed eye condition
• About to go on an area having crossed a waterfall
• Leader in Congress introducing a law about cigarette problem in fall
• What a heavy downpour! (8)
• Optical disorder producing falls
• So much coming down that one can't see through it
• Visual impairment causing fall?
• Falls about and cheers Queen show
• Can't see with so big a fall