In Esperanza's case, her ophthalmologist provided comprehensive medical information which verified a substantial limitation in her vision and described the limitations; supporting her request for alternate format materials.
Determining a student's eligibility to receive accommodations must be done by the campus office that is designated with that responsibility, the SDRC. It is done based on a formal diagnostic assessment provided by properly credentialed professionals and is evaluated according to the institution's guidelines.
Faculty have neither the obligation nor the right to review a student's medical documenation. In fact, faculty members have no legal right to ask for that kind of information. If a student hands you his or her documentation, you should hand it back and inform the student that only the SDRC can evaluate diagnostic information.