CPO Practice Test

CPO Exam at a Glance

What changed for CPO in 2026

• Oct 27, 2026: Retake policy changed to Retake from the next two-week window; new application and fee each time (previously Next two-week window; new application and fee each time).^[2]
• Oct 27, 2026: Passing score changed to 500 on a 200–800 scaled score (previously 500 on a 200–800 scale).^[2]
• Oct 27, 2026: Validity changed to 3 years (previously Three-year renewal cycle).^[3]
• Oct 27, 2026: Exam fee changed to $290 application fee ($100 of it non-refundable) (previously $290 application fee).^[1]
• Oct 27, 2026: Score release changed to Emailed link about 4 weeks after the testing period closes (previously Emailed link ~4 weeks after testing period closes).^[2]
• Oct 27, 2026: Eligibility changed to HS diploma + 6 months full-time eye care work + attestation form (previously HS diploma + 6 months full-time eye care work + attestation).^[2]
• Oct 27, 2026: Delivery changed to Prometric test centers or live remote proctoring (previously Prometric test center or live remote proctoring).^[4]

The Certified Paraoptometric (CPO) exam is the foundational certification for allied health professionals in optometry. Passing this exam demonstrates your competence in front-office procedures, pre-testing, and contact lens instruction, setting the stage for future advancement to Certified Paraoptometric Technician (CPOT).

If you are searching for a CPO test eye, start with the free questions on this page: every answer comes with an explanation, and the study notes below cover the CPO exam topics in order.

If you are beginning your career in optometric support, start with our CPOA practice test to build a strong foundation in basic ophthalmic procedures and patient care.

According to Commission on Paraoptometric Certification, “The scale range for the examination is 200 to 800 with a passing point of 500.”^[2]

Worked examples: how to reason through CPO questions

These are practice questions written for this site, not questions from the real exam. Each explanation shows why the right answer is right and why the others are wrong.

Example 1

Question: During a Goldmann applanation tonometer calibration check, the feeler arm floats perfectly at the '0' and '2' (20 mmHg) positions but falls toward the examiner at the '6' (60 mmHg) position, even when the dial is at 6.05. This indicates:

1. The tonometer is reading accurately across all pressures.
2. The tonometer is overestimating high intraocular pressures.
3. The tonometer is underestimating high intraocular pressures.
4. The calibration bar is being used incorrectly.

Answer: C. The tonometer is underestimating high intraocular pressures.

Explanation:

The correct answer is that the tonometer underestimates high pressures. The check is done at several marks on the calibration bar. Here the arm balances correctly at the low marks, so the instrument is fine there, but at the high mark it falls toward the examiner even when the dial is set slightly above 6. That means the mechanism is not applying enough force, so real pressure is higher than the reading.

Option A is wrong because a failed check at any mark means the instrument is not accurate across its range. Option B has the direction reversed: overestimating would show the opposite behavior. Option D is wrong because nothing in the stem suggests misuse of the bar, and the error appears only at the high end.

Rule to remember: if the arm needs extra dial to balance, the tonometer reads low at that point.

Example 2

Question: What is the primary purpose of applying punctal occlusion after instilling eye drops?

1. To increase the blink rate
2. To prevent the drop from evaporating
3. To reduce systemic absorption of the medication
4. To clean the eyelid margin

Answer: C. To reduce systemic absorption of the medication

Explanation:

The correct answer is to reduce systemic absorption. Pressing gently on the inner corner of the eye blocks the puncta, the small drainage openings that carry tears toward the nose. With drainage blocked, the drop stays on the eye longer and less of it reaches the nasal lining, where it can be absorbed into the bloodstream.

Option A is wrong because occlusion has nothing to do with blinking; patients are usually asked to keep the eye closed. Option B is wrong because evaporation is not the problem the technique solves. Option D is wrong because cleaning the lid margin is a separate hygiene step done with different materials.

Rule to remember: punctal occlusion keeps the drug on the eye and out of the rest of the body, which matters most for drops with systemic side effects.

Example 3

Question: A lens prescription reads -1.00 -0.50 x 180. When transposed to plus cylinder form, it becomes:

1. -1.50 +0.50 x 090
2. -0.50 +0.50 x 090
3. -1.50 +0.50 x 180
4. -0.50 -0.50 x 090

Answer: A. -1.50 +0.50 x 090

Explanation:

The correct answer is -1.50 +0.50 x 090. Transposition follows three steps. Add the cylinder to the sphere: -1.00 plus -0.50 gives -1.50. Change the sign of the cylinder: -0.50 becomes +0.50. Rotate the axis by 90 degrees: 180 becomes 090.

Option B keeps the original sphere and never adds the cylinder to it. Option C does the sphere and sign correctly but leaves the axis at 180, so the cylinder power sits in the wrong meridian. Option D leaves the cylinder negative and also gets the sphere wrong, so it is not a plus cylinder form at all.

Rule to remember: new sphere is sphere plus cylinder, flip the cylinder sign, and move the axis 90 degrees. All three changes must happen together.

How to use these practice tests

Start with the Commission's current handbook and exam details, since they define what is tested. Note the topic headings, then use them to decide where your gaps are before you open any practice set.

1. Take one short set cold, such as CPO Basic Science, and write down every question you miss or guessed.
2. Group those misses by topic. If they cluster in optics, work through Ophthalmic Optics and Dispensing. If they cluster in clinical testing, try Tonometry and Visual Field Testing.
3. For every wrong answer, read the explanation and restate the rule in your own words. Redo the same set a few days later to see whether the rule stuck.
4. Add the workplace topics, such as Ocular Pharmacology and Professional Issues, so they do not get left for the last days.
5. Close to test day, practise under the real time limit of 90 minutes, and check the delivery rules for your test center or remote session.

Our questions are written by us for practice and are not real exam questions, so treat them as a way to find weak spots, not as a preview of the exam.

Many optometry practices will pay for your CPO exam fees and study materials. Ask your employer about reimbursement options!

Ready to Pass the CPO Exam?

Join thousands of successful Paraoptometrics. Start practicing today with our free CPO exam questions and comprehensive resources.

Submit your renewal application and CE credits to the CPC before the November 1st deadline of your renewal year to avoid late fees.

Official Resources

• American Optometric Association (AOA) – Paraoptometric Certification: the AOA's official hub for the CPO, CPOA, and CPOT credentials, explaining how the paraoptometric certification pathway works.
• Commission on Paraoptometric Certification (CPC): the AOA body that writes, administers, and scores the CPO exam — find eligibility requirements, renewal rules, and the code of ethics here.
• 2026 CPO Exam Details & Fees (PDF): the AOA's current official document listing testing windows, application deadlines, and exact fees for the 2026 CPO exam cycle.

Sources & last verified

1. Commission on Paraoptometric Certification — time limit, exam fee (official source). “Certified Paraoptometric (CPO) $290 100 20 1.5 hours (90 min)” Verified Oct 27, 2026 · source checked Oct 27, 2026.
2. Commission on Paraoptometric Certification — passing score, retake policy, eligibility, score release (official source). “The scale range for the examination is 200 to 800 with a passing point of 500.” Verified Oct 27, 2026.
3. ptcny.com — validity (official source). “Recipients must renew their certification every three years to remain current in their field.” Verified Oct 28, 2026 · source checked Oct 28, 2026.
4. Commission on Paraoptometric Certification — delivery (official source). “Those taking the CPO, CPOA, or CPOT examination may choose live remote proctored testing when technical and space requirements are met.” Verified Oct 31, 2026 · source checked Oct 31, 2026.

How we verify: editorial & fact-checking policy. Report an error: contact us.