The Optometry Admission Test is your gateway to optometry school — and unlike some professional school exams, the OAT has specific eligibility requirements you need to meet before you can register. You also need to understand the full cost picture before you commit, because it's not just the registration fee.
The OAT is administered by the Association of Schools and Colleges of Optometry (ASCO) and delivered by Prometric at authorized testing centers across North America. It's a computer-based exam that tests the science knowledge and reading comprehension skills that optometry schools use to evaluate applicants alongside GPA and other materials.
The OAT exam fee is $635 for a standard registration. That covers your first attempt and the automatic score report sent to up to five optometry programs of your choice.
Additional fees to budget for:
That $635 base fee can climb quickly once you add score reports to additional programs and account for scheduling flexibility. Budget $700–$800 to be safe, more if you're applying to 10+ programs.
To register for the OAT, you must:
There's no minimum GPA required to register — but optometry schools will see both your OAT score and your transcript, so weak grades alongside a strong OAT score won't necessarily overcome an uncompetitive academic record.
You can take the OAT a maximum of three times total. That's a hard lifetime cap — not per year, not per application cycle. Three total attempts, ever.
Between attempts, you must wait at least 90 days. So if you take the exam and aren't satisfied with your score, you've got a 90-day window to identify weaknesses, prep harder, and come back stronger. Use that time well.
Given the three-attempt cap, most serious applicants treat each sitting as a high-stakes event. Don't schedule your first attempt before you're genuinely ready. It's better to wait an extra month and prep thoroughly than to burn an attempt and compress your future options.
The OAT covers five content areas across seven sections. Here's the full breakdown:
Total: 230 scored questions. The entire exam takes about 4 hours and 10 minutes including a break and the optional survey.
Scores are reported on a 200–400 scale per section plus an overall Academic Average. Most competitive optometry programs look for scores in the 320–360 range overall, though each school has its own competitive benchmark.
Registration goes through ASCO's official website at optomcas.org or the dedicated OAT portal. The process:
The OAT is available year-round at Prometric centers. There's no fixed exam calendar — you pick a date and time that works for your schedule, subject to seat availability at your preferred testing location.
Your OAT score report is sent to ASCO-member optometry programs. You choose which programs receive your scores during registration — up to five are included in your base fee. You can designate additional programs later for $25 each.
One important feature: the Score Hold option. If you're unsure whether you'll be happy with your score, you can request a 30-day hold before the results are sent anywhere. You can then decide to release your scores or cancel the score report (though the exam fee is not refunded). This costs $30 to exercise.
If you choose to cancel your score report, that attempt still counts toward your three-attempt lifetime limit — so don't use a score hold as a safety net to take the exam without consequences.
Detailed OAT test prep resources and full-length OAT practice tests can help you build the score you need before you sit for the real thing.
With only three lifetime attempts available, there's no room for casual test-taking. The students who perform best on the OAT aren't necessarily the ones who studied the most content — they're the ones who studied smarter: using practice tests to identify weak areas, drilling those areas specifically, and building exam-day pacing through timed full-length simulations.
Start your prep well before your target test date. Chemistry and physics content in particular requires time to absorb — they don't respond well to cramming. Biology is high-volume but more memorization-friendly. Reading Comprehension rewards consistent practice more than content study.
Use our free OAT practice tests to see where you stand right now. Identify your weakest sections, focus your study plan there, and go into your registration window confident you're ready to perform.