Start with IJCAHPO’s official COA content areas (effective August 1, 2025) and spend the most time where the weight is highest. History and documentation, general medical knowledge, patient services and education, visual assessment, pupil assessment, and tonometry make up 46% of the exam. Then practice timed: 200 questions in 180 minutes averages 54 seconds each.
Checked against official IJCAHPO sources on
Before you study: confirm you’re eligible and know your deadline
IJCAHPO offers three COA eligibility pathways that combine training with supervised ophthalmology work. They are summarized in the COA® certification guide and the COA exam FAQ.
The clock that shapes your plan: once your application is approved, you have a 90-day eligibility period to take the exam, with one 30-day extension available for $50. Normal processing takes 2–4 weeks (rush processing is $50). Fees here are from IJCAHPO’s fee schedule dated Feb 2025. Plan your study so the exam lands inside that window, or do most of your studying before you apply.
Step 1: Get the official content outline
IJCAHPO publishes the COA examination content areas (opens in a new tab) with a weight for each, plus a task-level content breakdown (opens in a new tab). Here are all 22 areas, sorted by weight (they total 100%):
| Content area | Weight |
|---|---|
| History & Documentation | 9% |
| Ophthalmic Patient Services & Education | 8% |
| General Medical Knowledge | 8% |
| Visual Assessment | 7% |
| Pupil Assessment | 7% |
| Tonometry | 7% |
| Visual Field Testing | 6% |
| Pharmacology | 6% |
| Refraction | 5% |
| Ophthalmic Imaging | 5% |
| Medical Ethics, Legal & Regulatory | 4% |
| Ocular Motility Testing | 4% |
| Lensometry | 3% |
| Biometry | 3% |
| Supplemental Testing | 3% |
| Surgical Assisting | 3% |
| Keratometry | 2% |
| Diagnostic Ultrasound | 2% |
| Microbiology | 2% |
| Optics & Spectacles | 2% |
| Contact Lenses | 2% |
| Equipment Maintenance & Repair | 2% |
Some older study materials use a different, shorter list of content headings. Check that any book or course you use matches the current list.
Step 2: Take a baseline and rank your gaps
Do a mixed set of questions across all areas, such as our free COA practice questions, and note which areas you missed. Then put your time where a heavy weight meets a weak score: a weak area worth 8% deserves more hours than a weak area worth 2%. This is our rule of thumb, not an IJCAHPO formula.
Retaking the exam? Start from the performance report you received at the test center, which IJCAHPO says outlines feedback for each assessment area.
Step 3: Build a weekly plan
IJCAHPO does not prescribe how long to study. The plan below is an example only; stretch or compress it based on your baseline and your exam date.
| When | Focus |
|---|---|
| Weeks 1–2 | History & Documentation, General Medical Knowledge, and Ophthalmic Patient Services & Education (the three largest areas). |
| Weeks 3–4 | Visual Assessment, Pupil Assessment, and Tonometry, with chair-side practice. |
| Weeks 5–6 | Visual Field Testing, Pharmacology, Refraction, Ophthalmic Imaging, Medical Ethics/Legal/Regulatory, and Ocular Motility Testing. |
| Week 7 | The 2–3% areas in short blocks: Keratometry, Lensometry, Biometry, Diagnostic Ultrasound, Microbiology, Optics & Spectacles, Contact Lenses, Equipment Maintenance & Repair, Surgical Assisting, and Supplemental Testing. |
| Week 8 | One or more full-length timed runs, review every miss, and rest before test day. |
Step 4: Learn at the chair, not just on the page
Many content areas are clinical procedures: visual assessment, pupils, tonometry, visual fields, lensometry, and keratometry. If you can, practice them under a supervising ophthalmologist or an experienced technician, which fits IJCAHPO’s supervised-work eligibility model. For the optics-heavy topics, see keratometry basics, lens transposition, and the transposition calculator.
Step 5: Practice timed, then simulate the full exam
The COA exam has 200 questions in 180 minutes, which averages 54 seconds per question. Some practical habits:
- Answer the questions you know first, flag the hard ones, and come back.
- Read every explanation, including for questions you got right.
- Track misses by content area so your plan keeps re-weighting itself.
- Before test day, do at least one full-length, 200-question timed run to build stamina. That’s our advice, not an IJCAHPO requirement.
Which study materials to use
- IJCAHPO’s official materials: IJCAHPO sells a COA study guide and related packages in its online store, and runs certification exam prep sessions (opens in a new tab). Check current prices with IJCAHPO.
- IJCAHPO’s COA Practice Examination is a real exam sitting, not a study resource. It costs $150 to sit. If you pass, you pay another $150 within 30 days of your official results to receive the COA certificate. It is not considered a formal attempt unless you pass; if you don’t, there is no refund, and you would apply with the initial COA exam fee within 12 months.
- Our free tools: free COA practice questions with explanations. These are original questions, not real exam items.
Test-day basics
You take the COA at a Pearson VUE test center. Bring the identification that IJCAHPO and Pearson VUE require; check their current instructions before you go. Rescheduling 5–29 business days before your appointment costs $25, and a no-show (canceling less than 5 business days ahead) costs $85.
When you finish, you get an unofficial pass/fail result and a performance report at the test center. Official results arrive by mail in 2–4 weeks.
If you don’t pass
It happens, and the performance report tells you where to focus. IJCAHPO lists a first retest at $250 and a second at $150, and a retest application must be received within 12 months of your initial exam. Re-weight your plan toward the areas the report flags, then repeat Steps 2–5.
Frequently asked questions
How long should I study for the COA exam?
IJCAHPO does not prescribe a study length. As guidance, plan backward from your test date so your preparation fits inside the 90-day eligibility period after approval, and adjust the time to how you score on a baseline quiz.
Source: IJCAHPO — Fee schedule and timelines, dated Feb 2025 (PDF) (opens in a new tab)
What should I study first for the COA?
Start with the highest-weighted content areas on IJCAHPO’s official list: history and documentation (9%), general medical knowledge (8%), and ophthalmic patient services and education (8%). Then move to visual assessment, pupil assessment, and tonometry at 7% each.
Source: IJCAHPO — COA exam content areas, effective 8/1/2025 (PDF) (opens in a new tab)
Which COA content areas carry the most weight?
Six areas make up 46% of the COA exam: history and documentation (9%), general medical knowledge (8%), ophthalmic patient services and education (8%), and visual assessment, pupil assessment, and tonometry (7% each). Ten areas carry only 2% or 3% each.
Source: IJCAHPO — COA exam content areas, effective 8/1/2025 (PDF) (opens in a new tab)
How many practice questions should I do before the COA?
IJCAHPO does not set a number. As guidance, do enough mixed questions to measure every content area, review every explanation, and complete at least one full 200-question timed run so the length of the real exam is familiar.
Source: IJCAHPO — Certified Ophthalmic Assistant (COA) (opens in a new tab)
Is the IJCAHPO COA study guide enough to pass?
IJCAHPO does not say any single resource is enough; its own advice is to study all content areas and use multiple resources, practice quizzes, and tests. Its official study guide is a reasonable starting point, and you can add other materials for areas where you score lower.
Source: IJCAHPO — Certified Ophthalmic Assistant (COA) (opens in a new tab)
How do I pace myself on the COA exam?
The COA allows 180 minutes for 200 questions, which averages 54 seconds per question. Answer the ones you know first, mark harder ones to revisit, and check your pace at regular intervals.
Source: IJCAHPO — Certified Ophthalmic Assistant (COA) (opens in a new tab)
Should I take IJCAHPO’s COA practice examination?
It depends on your budget and readiness. The practice exam costs $150, and if you pass you pay another $150 within 30 days of official results to count it as your certification; a practice exam you don’t pass is not a formal attempt, there is no refund, and you would retest by paying the $300 initial COA exam fee within 12 months.
Sources: IJCAHPO — Fee schedule and timelines, dated Feb 2025 (PDF) (opens in a new tab) ; IJCAHPO — Certification FAQs (opens in a new tab)
How should I change my study plan after a failed COA attempt?
Use the performance report from the test center, which gives feedback for each content area, to re-rank your weakest high-weight areas. IJCAHPO lists a first retest at $250 and a second at $150, and a retest application must be received within 12 months of your initial exam.
Sources: IJCAHPO — Core Criteria Handbook (PDF) (opens in a new tab) ; IJCAHPO — Fee schedule and timelines, dated Feb 2025 (PDF) (opens in a new tab)
Official sources
- IJCAHPO — COA exam content areas, effective 8/1/2025 (PDF) (opens in a new tab)
- IJCAHPO — Core examination content areas, task-level detail (PDF) (opens in a new tab)
- IJCAHPO — Certified Ophthalmic Assistant (COA) (opens in a new tab)
- IJCAHPO — Fee schedule and timelines, dated Feb 2025 (PDF) (opens in a new tab)
- IJCAHPO — Core Criteria Handbook (PDF) (opens in a new tab)
- IJCAHPO — Certification and Recertification Procedures and Policies (PDF) (opens in a new tab)
- IJCAHPO — Certification FAQs (opens in a new tab)
- IJCAHPO — Certification exam prep sessions (opens in a new tab)
Last reviewed . Requirements, fees, and dates change — always confirm with the official source before you register or apply.