Flatfishes have a flat, oval body with an asymmetrical eye arrangement when adult: they both lie on the same side of the body. Flatfish usually live on sandy ground and are carnivores. Flatfish can adapt their upper side to their environment in terms of colour.
The Moses sole is also called right-eye sole, because when viewed from the front, the eyes are above or to the right of the mouth.
The Panther-Butt is also called left-eye-sole and has the eyes left of the mouth when viewed from the front. These are also usually higher and the males have long threads on the pectoral fin.

Excerpt from "Life in the Red Sea." iBooks.