A Doctor of Optometry (O.D.) degree is required to work as an optometrist. Most schools of optometry require three years (90 credits) of undergraduate work for admission, although some schools require a bachelor’s degree. The Optometry Admissions Test (OAT) is required for optometry school and should be taken at least a year in advance of applying. Each of the 17 optometry schools in the United States and Puerto Rico has slightly different requirements. The basic requirements for most schools are contained below in the suggested schedule. It is essential that the applicant obtain a catalog from the specific school or college of optometry where he or she plans to apply to see what changes are needed. The Association of Schools and Colleges of Optometry has a Web site of information on all of the schools of optometry at www.opted.org.