There are a few types of what are called " blind fish" or eyeless fish – fish that don't have any eyes – I suppose because it's so dark in the cave, they didn't need eyes.

有几种所谓的“盲鱼”或无眼鱼——没有眼睛的鱼——我想是因为洞里太黑了，它们不需要眼睛。