Chris, this is Professor Smith. Talk in a normal voice and tone. Try to remember to talk in a normal voice when addressing the student. Don't avoid the student. People who have had little contact with the visually impaired are often afraid of offending them so they avoid personal contact.
Visual impairment produces enough social isolation in itself.
Don't add to the student's isolation. In the Classroom Do not patronize the student by giving him or her a good grade regardless of effort. You do the visually impaired student no favor when you expect less of him or her or refuse to challenge him or her. The student wants and expects to be held responsible for the same class content as any other student. However, the visually impaired student must, at the same time, be given the same opportunity to obtain class material.