The Optometry Admission Test (OAT) is a test used to determine applicants’ qualification for admission to a school of optometry. All colleges of optometry in the United States and the University of Waterloo in Canada use scores from the exam. The test consists of four sections: Survey of the Natural Sciences, Reading Comprehension, Physics, and Quantitative Reasoning. The test lasts, at most, for a total of 4 hours and 50 minutes.