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An honest look at pass rates, the topics that trip up the most candidates, and a study plan that actually works.
~64%
Pass Rate
125
Questions
2 hrs
Time Limit
70%
Passing Score
The ABO exam — officially called the NOCE (National Opticianry Competency Exam) — is moderately difficult. About 1 in 3 candidates fail on their first attempt. That's not a coin flip, but it's far from a guaranteed pass.
The difficulty depends heavily on your background. Candidates who completed a formal opticianry program or have 2-3 years of hands-on dispensing experience pass at significantly higher rates than those self-studying without practical experience. The exam tests both book knowledge and real-world application, so experience matters.
Pass rates have been gradually improving over the past several years, likely due to better study materials and more accessible exam prep resources. Here's the trend:
Source: ABO-NCLE published exam statistics
For comparison, the NCLE basic exam (contact lens certification) has a pass rate of about 59%, and the advanced ABO exam drops to roughly 52%. The basic ABO exam is the most passable of the group, but still requires serious preparation.
The NOCE covers six content domains. Understanding the weight of each domain tells you where to spend your study time:
Ophthalmic Optics
HardOphthalmic Products
MediumDispensing Procedures
MediumInstrumentation
HardOcular Anatomy & Refraction
Easy-MedLaws & Regulations
EasyNot all 125 questions are equally difficult. These are the areas where candidates consistently lose the most points:
Prentice's Rule (Δ = P × d / 10) questions require you to calculate induced prism, determine base direction, and understand how decentration affects a prescription. You need to draw out every problem — candidates who try to do these in their head make errors. Expect 5-8 questions on prism concepts.
Vertex distance compensation, spherical equivalent, effective power, and resultant prism calculations. You need to be comfortable with the formulas, not just recognize them. The exam gives you the formula sheet — but if you haven't practiced applying them, the sheet alone won't save you.
Reading a lensometer, understanding when to use which instrument, and interpreting measurements. This domain is 15% of the exam but disproportionately hard for candidates without lab or dispensary experience. If you've never used a lensometer in person, prioritize this.
Progressive lenses, bifocal segment types, anti-reflective coatings, photochromic materials, high-index options. The product knowledge domain is broad. You need to know which lens type solves which patient problem, not just the names.
Despite the ~36% fail rate, the ABO exam is very passable with the right preparation. Here's what works in your favor:
Multiple choice only
No fill-in-the-blank or essay questions. If you can narrow down to two options, you have a 50% shot.
No trick questions
The exam tests competency, not cleverness. If you know the material, the correct answer is clearly correct.
2 hours is plenty
Most candidates finish in 60-90 minutes. Time pressure is not a major factor for this exam.
70% to pass
You can miss 37 questions and still pass. You don't need perfection — you need solid fundamentals.
Quarterly test windows
The exam is offered 4 times per year at Prometric centers or via remote proctoring. Flexible scheduling.
20% is easy points
Laws/regulations and ocular anatomy (20% combined) are largely memorization. These are reliable points if you study.
A 2-3 month study plan with daily practice is the sweet spot. Here's a week-by-week structure that has worked for thousands of candidates: