All students applying to optometry schools must take the Optometry Admission Test (OAT). The OAT is an admission test designed to provide optometry education programs with a means to assess an applicant's potential for success. 

The OAT consists of a battery of four tests on the following: Survey of the Natural Sciences, Physics, Reading Comprehension, and Quantitative Reasoning. 

The OAT allows for unlimited repeats however students must wait 90 days after three attempts and permission is required. There are numerous resources for OAT preparation and students should plan on spending about 2 months to prepare. The OAT costs $450 and is administered year round by Prometric test centers in the United States and Canada.