An OAT score report includes a separate scaled score for each section you take, and understanding what those numbers actually mean makes it much easier to evaluate your own results realistically.
The 200-400 scale
The OAT reports scores on a 200-400 scale for each section -- a genuinely different scale from the DAT's 200-600 system, even though both exams are administered by the same body, ADA's Department of Testing Services. If you're researching both exams, don't assume a numeric score that sounds strong on one scale translates directly to the other.
Related: What to Expect on the OAT: Format, Scoring, and How to Prepare
Individual section scores
Your report includes a separate scaled score for each of the four sections: Biology, General Chemistry, Organic Chemistry, Reading Comprehension, Physics, and Quantitative Reasoning, along with a combined Total Science score covering the three science subjects together. Optometry schools can review these individual scores separately, not just an overall summary number.
No pass/fail threshold
Unlike a licensing exam with a fixed passing score, the OAT has no universal pass/fail cutoff. Individual optometry schools set their own admissions standards, and most look at your section scores individually rather than applying one fixed number across every applicant -- meaning "what score do I need" doesn't have one universal answer, and depends on the specific programs you're applying to.
What optometry schools actually look at
Most optometry schools publish, or will share on request, the typical score ranges of their recently admitted classes -- both for Total Science and for individual sections. Checking these specific ranges for your target schools is far more useful than aiming for a generic "good score," since competitive ranges vary meaningfully between programs. Some schools may also weight specific sections, such as Physics or the individual science subjects, more heavily than others in their own internal review process -- check with your specific target schools if you want more detail on how they weight the report.