Why are Eye Exams Important? Catching problems in their early stages can prevent vision loss. An eye exam at Dr. Gretchen Brewer and Associates can diagnose eye diseases early on by catching things you haven’t yet noticed. Preparing for an Eye Exam Make the most of your exams by knowing how often to get them, and what information to bring with you to our Roosevelt Mall office or our Montgomery Mall office in Philadelphia. Your Comprehensive Eye Exam Learn what common tests and procedures to expect during a routine eye exam at Dr. Gretchen J. Brewer O.D. and Associates.