- The OSA exam has 80 multiple-choice questions in 60 minutes, scored via modified Angoff.
- Surgical Procedures (27%) and Instruments (25%) together make up over half the exam.
- Initial exam fee is $145; retest fee is $95; recertification runs $125 every 36 months.
- Recertification needs 30 surgical cases (27+ from Category A), or CE credits offsetting up to 10.
Exam Snapshot: The Core Numbers
If you only have five minutes before your OSA certification exam, these are the numbers that matter most. IJCAHPO administers the Ophthalmic Surgical Assisting credential at Pearson VUE test centers nationwide, and the exam format itself is refreshingly predictable once you know the shape of it.
- Format: 80 multiple-choice questions, 60 minutes total testing time.
- Scoring method: Modified Angoff standard-setting process (not a fixed percentage cutoff - see the OSA Passing Score guide for how this works).
- Initial fee: $145. Retest fee: $95.
- Validity: 36 months, linked to your core COA/COT/COMT credential.
- 2023-2024 results: 111 examinees, 92 passes, an 83% pass rate - full context in the OSA Pass Rate breakdown.
Because the exam uses a modified Angoff process rather than a simple raw-score cutoff, your target isn't "70% correct" - it's built from item-by-item difficulty ratings assigned by subject-matter experts. That distinction matters for how you interpret practice-test scores, which we cover in more depth on our OSA practice test platform.
Domain Breakdown at a Glance
Eight content domains define the entire exam blueprint. Memorize the weightings below - they tell you exactly where your study hours should go.
| Domain | Weight |
|---|---|
| 1. Pre-Operative Preparation of the Patient | 5% |
| 2. Instruments | 25% |
| 3. Aseptic Technique | 20% |
| 4. Ophthalmic Anesthesia | 5% |
| 5. Surgical Procedures | 27% |
| 6. Surgical Complications | 3% |
| 7. Ophthalmic Surgical Pharmacology | 10% |
| 8. Minor Surgery | 5% |
For a full walkthrough of what each domain actually tests - instrument names, aseptic breaks, phaco steps - see the OSA Exam Domains Guide.
Registration, Fees & Eligibility Pathways
Before you can sit for the exam, you need to qualify through one of four IJCAHPO-defined pathways. All four require endorsement from a sponsoring ophthalmologist - there's no self-attested route.
SA1-SA4 Pathways
Eligibility combines core certification status (COA/COT/COMT where applicable) with one of several routes into the OR.
- SA1: Accredited ophthalmic medical education plus qualifying OR experience
- SA2: Approved surgical-assisting course paired with a documented case log
- SA3-SA4: Eligible surgical technology, nursing, military, or ophthalmic surgical professional (OSP) background
Every pathway still requires the sponsoring ophthalmologist sign-off, so line that up early - it's often the longest lead-time item in the whole process. Full eligibility detail lives in the OSA Requirements guide.
On cost: budget $145 for your initial attempt and $95 if a retest is needed. These fees, along with what to expect at recertification, are broken down further in the OSA Certification Cost breakdown. For scheduling windows and how far in advance to register at Pearson VUE, check the OSA Exam Dates guide.
High-Yield Topics by Domain
Generic "know your terminology" advice won't cut it here. Below are the specific things candidates consistently need to nail, organized by domain.
Domain 2: Instruments (25%)
This domain tests instrument identification, function, and care - not just names.
- Recognize instruments by shape/function: keratomes, cannulas, forceps, speculums, cystotomes
- Know proper handling, cleaning, and sterilization requirements for delicate microsurgical tools
- Understand instrument setup order for common procedures (cataract, glaucoma, oculoplastics)
Domain 3: Aseptic Technique (20%)
Expect scenario-based questions on maintaining a sterile field, not just definitions.
- Sterile field setup, gowning/gloving sequence, and break-in-technique recognition
- Sterilization methods (steam autoclave vs. chemical) and their appropriate use cases
- Contamination scenarios: what constitutes a break and the correct corrective action
Domain 5: Surgical Procedures (27%)
The single heaviest domain - expect deep coverage of common ophthalmic surgeries.
- Step-by-step flow of cataract extraction (phaco), including the surgical assistant's role at each stage
- Glaucoma procedures, corneal procedures, retinal and oculoplastic surgery basics
- Positioning, draping, and equipment readiness specific to each procedure type
Domain 7: Ophthalmic Surgical Pharmacology (10%)
Focused on drugs used intra- and peri-operatively, not general pharmacology.
- Mydriatics, miotics, viscoelastics, and intracameral antibiotics - indications and timing
- Local anesthetic agents and their onset/duration profiles (ties into Domain 4)
- Recognizing adverse drug reactions during a case
The three lower-weighted domains - Pre-Operative Preparation (5%), Ophthalmic Anesthesia (5%), and Minor Surgery (5%) - still appear on every exam, so don't skip them entirely; just don't over-invest relative to their share of the blueprint. Surgical Complications, at only 3%, is the lowest-weighted domain but still worth a focused pass since its content (infection, hemorrhage, wound leak signs) overlaps with aseptic technique and procedures.
Key Takeaway
Study Instruments, Aseptic Technique, and Surgical Procedures first and deepest - they're worth nearly three-quarters of your score. Everything else is reinforcement, not your primary battleground.
Recertification Facts to Memorize
OSA certification is valid for 36 months and tied to your core credential status. Recertification isn't just a fee - it's a case-log requirement.
- Recertification fee: $125
- Case requirement: 30 surgical cases total
- Category A minimum: at least 27 of those 30 cases must be Category A
- CE substitution: up to 10 surgical CE credits can replace up to 10 cases
This is also a good moment to weigh whether recertification effort and cost pay off long-term - see the Is OSA Certification Worth It? ROI Analysis and the OSA Salary Guide for how the credential factors into hiring and pay conversations with ophthalmology practices and ASCs that recruit for these roles.
Final-Week Review Plan
With a 60-minute, 80-question format, pacing practice matters as much as content review in your last stretch. Here's how to sequence a compressed final push without drifting into generic study advice.
Surgical Procedures + Instruments
- Drill instrument identification flashcards by procedure type
- Walk through cataract, glaucoma, and corneal procedure sequences step by step
Aseptic Technique + Pharmacology
- Practice scenario questions on sterile field breaks
- Review mydriatics, viscoelastics, and local anesthetics side by side
Lower-Weight Domains + Timed Practice
- Fast review of Pre-Op Prep, Anesthesia, Minor Surgery, Complications
- Run full-length timed practice sets at 60 minutes for 80 questions
Light Review Only
- Skim your weakest domain notes; avoid cramming new material
- Confirm Pearson VUE appointment details and ID requirements
For a longer-horizon version of this plan, including how to structure weeks if you're starting from scratch, see the OSA Study Guide: How to Pass on Your First Attempt. And if you're still gauging whether your current prep pace is realistic, the How Hard Is the OSA Exam? Difficulty Guide gives a candid read on where most candidates struggle.
Frequently Asked Questions
The exam consists of 80 multiple-choice questions administered in a 60-minute testing session at Pearson VUE test centers.
The initial exam fee is $145. If you need to retest, the fee is $95. Recertification every 36 months costs $125.
Surgical Procedures (27%) is the single heaviest domain, followed closely by Instruments (25%) and Aseptic Technique (20%). Together these three make up 72% of the exam content.
IJCAHPO uses a modified Angoff standard-setting process rather than a fixed percentage cutoff, meaning the passing standard is derived from item-level difficulty judgments rather than a flat score threshold.
Recertification requires 30 surgical cases within the 36-month cycle, with at least 27 from Category A. Up to 10 surgical CE credits can substitute for up to 10 of those cases, along with the $125 recertification fee.
Bookmark this page as your quick-reference cheat sheet, but pair it with structured timed practice - run through full-length simulations on our OSA practice test platform to build the pacing instincts that a one-page summary can't teach on its own.