try not to feed too much of fatty food like feeder fishes,it also promots drop eye....besides,i've also heard that chewing hard things also promotes drop eye...

if you want to cure,follow the mentioned ways posted earlier...it's the only way....

however,prevention is better than cure..there are many discussions of the cause of drop eye...even when your aro always stare at the bottom of your aquarium...providing gravel would help..i put ceremic tiles as they dont keep up as much waste as gravel.besides,sometimes it's in the genes of the fish...so there's no cure to it..

GOOD LUCK...