My neighbour had a blind ewe - cast and attacked by crows. She was in lamb at the time, made it through and threw 2 lambs. They acted as 'guide lambs' for her in the field, she followed them around to feed. A bit disconsolate when weaned though...
He separated her off for several months, best part of a year, and I used to walk past her every day. She seemed fine, stood around a lot, adjusted her posture to use ears more than eyes, but ate well. Then culled...
Shame in some ways; she seemed a very mature and good mother. Not meant to be, though.