Many years ago (prior to the debut of step) I was about to begin a low-impact class when two women approached me. One of them said, “I’d like to let you know that I’m blind. I do have a little peripheral vison & I follow my friend”.
Internally I was freaking out, but said to her, “Oh thank you for letting me know! I’ll make sure to give my verbal cues in your direction.”
Having her in my classes did more for my ability to verbally cue than anything else ever did. I could watch her and see if my cues were effective or not. She was awesome at following, I must add. And she had a friend beside her, who’s feet she could sort of see – and to assist if necessary.
What I would suggest is that you hone in on your verbal cueing skills, and that this client would benefit from having a personal assistant or friend in class with him. You are instructing a group, and while you can give some individual attention, can’t neglect the group for one person. It also depends upon how large the group is – so if it’s a small class he might do well without someone with him.