I taight a gentle yoga class with a blind participant. She had her dog with her. I found that she could follow my verbal cues very well – and as Jacquelyn said, you really need to use your very best verbal cuing skills.
I also found that this participant (and I believe most sight-impaired people) was very familiar with the room orientation. So cues such as “Reaching your right arm toward the window” and “Stepping your front foot a few inches toward the door” were the easiest for her to follow.