ABS Pass Rate 2026: What the Data Shows

What the Pass Rate Data Actually Shows

Every candidate researching Part I Applied Basic Science eventually asks the same question: how many people actually pass? The National Board of Examiners in Optometry (NBEO) reports first-time pass rate data for its March administrations, and the most recent published figure is 68.7% for March 2024, based on 1,541 first-time takers. That single number gets repeated everywhere, but it only tells part of the story. A pass rate in the high 60s means that roughly one in three first-time candidates does not clear the 300 scaled-score cutoff on a given attempt - a meaningful risk for an exam that gates licensure in all 50 states, the District of Columbia, and Puerto Rico.

Unlike some credentialing exams, NBEO does not grade Part I ABS on a curve. Raw scores convert directly to a scaled score between 100 and 900, and the pass line stays fixed at 300 regardless of how any particular cohort performs. That design choice matters for how you should read pass-rate trends: improvements in the national number reflect changes in candidate preparation and pipeline quality, not a moving target that got easier.

The Three-Year Trend: 2022 to 2024

Looking at three consecutive March administrations gives a clearer picture than any single year in isolation:

The trend line moves upward by roughly 1.6 to 1.8 percentage points per year across this window. That is a gradual, steady improvement rather than a dramatic shift, which fits with an exam format that has stayed structurally consistent: 370 total items (350 scored, 20 unscored pre-test items), split into two 185-item sessions with four hours per session. When the exam structure doesn't change but the pass rate creeps upward, the more likely explanation is that candidates and the programs preparing them are getting better at targeting the content that actually appears on test day - not that the bar has moved.

For a full breakdown of how the scaled score and section cutoffs work together, see our companion piece on the ABS Passing Score, which walks through exactly what 300 on the 100-900 scale requires in raw-score terms.

Why Optics Drives So Many Failing Scores

If you want to understand where the pass-rate risk concentrates, start with the domain weighting. Optics - covering geometrical, physical, ophthalmic, and physiological optics - is the single largest content area on Part I ABS, representing 31 to 35 percent of the exam, or 108 to 122 of the 370 total items. No other domain comes close to that share. A candidate who is strong across anatomy, biochemistry, and pharmacology but shaky in optics is still carrying the heaviest possible weight of unresolved risk into the test center.

This is also the domain most likely to separate borderline passes from borderline failures, because it rewards calculation fluency and applied reasoning rather than straight recall. Optics questions frequently require you to work through a problem rather than recognize a fact, which means partial understanding translates poorly into partial credit - especially given that section scores report on a 0 to 99 scale with a 75 cutoff, independent of your overall scaled score.

How Scoring Mechanics Shape the Numbers

Two scoring features explain part of why the pass rate sits where it does rather than higher or lower. First, the overall pass-fail decision runs on the 300-point scaled cutoff, but section-level reporting uses a separate 0-99 scale with 75 as its own cutoff. That dual structure means a candidate can be strong in aggregate but still exposed in a specific area, since NBEO does not smooth outcomes across domains through curving.

Second, the exam includes 20 unscored pre-test items mixed into the 370 total, alongside the 350 items that count toward your score. Candidates cannot identify which items are which during the test, so the practical effect is that every item must be treated as scored. This is a structural reason why pacing across two 185-item, four-hour sessions matters as much as content mastery - there is no efficient way to "skip" items you suspect are unscored.

Domain-by-Domain Risk Breakdown

Beyond Optics, the remaining four domains carry enough combined weight to swing a borderline score in either direction. Understanding their relative size helps you allocate study time proportionally rather than evenly, which is a common mistake among first-time candidates.

NBEO also cross-maps all content into two condition blocks: Refractive Status, Sensory Processes and Oculomotor Processes (122 items) and Normal Health, Disease and Trauma (228 items) - within which Systemic Health alone accounts for 55 to 75 items. This dual mapping means the same knowledge gets tested from both a discipline lens and a clinical-condition lens, which is worth understanding before you build a study plan. For the complete percentage-by-percentage breakdown, see the ABS Exam Domains 2026 guide.

The Format Factor: Multiple-Response Items

Pass-rate discussions often overlook exam format, but format directly affects scoring outcomes. Approximately 10 to 15 percent of Part I ABS items are multiple-response: the stem specifies how many selections are required (2, 3, or 4), and the item is scored as completely correct or completely incorrect - there is no partial credit for selecting some but not all correct options.

This format detail compounds the difficulty of high-weight domains like Optics and Immunology/Microbiology/Pathology, because a candidate who understands 80% of a multiple-response question's underlying content still scores it as fully wrong. If you're assessing how difficult the exam feels relative to other licensure steps, this scoring rule is one of the more concrete reasons candidates report it as harder than expected. Our How Hard Is the ABS Exam guide breaks down format-driven difficulty in more depth.

A Focused Study Timeline Built Around Domain Weight

Generic weekly study templates rarely account for the fact that Optics alone can represent over a third of the exam. A more defensible approach allocates time roughly in proportion to domain weight, with earlier weeks reserved for the largest, most calculation-heavy domain.

For a more detailed week-by-week plan, including how to sequence review against a specific test date, see the full ABS Study Guide 2026.

Registration Timing and Its Effect on Outcomes

Pass-rate data reflects candidates who sat for the exam, but logistics can affect who ends up prepared to sit on their intended date. Part I ABS costs $1,490 for administrations from August 2026 onward (up from $1,445 previously), and late registration adds a non-refundable $400 fee with no guarantee of Pearson VUE seat availability. Candidates who register late risk either paying the penalty or losing their preferred test date entirely, which can compress study time and indirectly affect readiness. Full fee mechanics are covered in our ABS Certification Cost breakdown, and testing windows are detailed in the ABS Exam Dates guide.

Score reports post approximately seven weeks after the full administration, so candidates should plan licensure timelines with that delay in mind rather than assuming immediate results. If you're still confirming eligibility before registering, the ABS Requirements guide covers prerequisites in full.

Beyond the exam itself, many candidates also want to understand how Part I ABS fits into the broader career picture. Our ABS Salary Guide and ROI analysis address those downstream questions, while the ABS Cheat Sheet is useful for last-week review. If you want to practice under realistic conditions before test day, the practice platform at the main practice test site mirrors the two-session, multiple-response format described above.

Frequently Asked Questions