There were blind salamanders that lived in the underwater pits of the Klima Salt Mine, in the Tahari. There were also strange, eyeless fish known as lelts that had strange tendrils on the sides of their heads by which they felt their way around.
"...among the lelts, too, were, here and there, tiny salamanders, they, too, white and blind."--Tribesmen of Gor, 16:247
Otherwise, I don't have enough to go on to conjecture an answer. I can't remember if salt sharks were also blind, or not. Bat-like creatures known as varts guide themselves by sound waves bounding off objects, but I've never read that they were actually blind; I would assume they are simply near-sighted.
