Sorry for a delayed response, I only just joined SHVL.  I have a very visually impaired volunteer.  Fortunately, she worked at the hospital prior to her vision loss.  I paired her up with another volunteer who has been volunteering for many years, but is unable to escort patients.  The visually impaired volunteer escorts our patients (using her cane) and if she does not know where to go, the other volunteer will give verbal directions and she can get our patients where they need to go.  A match made in heaven.