Free COA Practice Questions
Original questions with explanations
These original COA practice questions are educational examples designed to exercise reasoning. They are not recalled exam items and do not imply access to live or confidential test content.
Question 1
Which instrument is used to measure intraocular pressure by flattening a known area of the cornea?
- A. Lensometer
- B. Goldmann applanation tonometer
- C. Keratometer
- D. Direct ophthalmoscope
Answer and explanation
B. Goldmann applanation tonometer Goldmann applanation tonometry estimates intraocular pressure from the force required to flatten a standard corneal area.
Question 2
What is the primary purpose of a lensometer?
- A. Measure a spectacle lens prescription
- B. Measure intraocular pressure
- C. Image the retina
- D. Assess tear production
Answer and explanation
A. Measure a spectacle lens prescription A lensometer measures lens power, cylinder axis, prism, and related spectacle-lens properties.
Question 3
When testing distance visual acuity one eye at a time, what should be done with the fellow eye?
- A. Apply pressure to it
- B. Occlude it without pressing on the globe
- C. Dilate it
- D. Keep both eyes uncovered
Answer and explanation
B. Occlude it without pressing on the globe The non-tested eye is occluded without pressure so the measured acuity represents the tested eye alone.
Question 4
Which medication class is used to dilate the pupil for examination?
- A. Mydriatic
- B. Miotic
- C. Lubricant
- D. Topical antibiotic
Answer and explanation
A. Mydriatic Mydriatic agents enlarge the pupil; some also produce cycloplegia depending on the drug.
Question 5
Why must reusable ophthalmic instruments be cleaned and disinfected according to current instructions?
- A. To improve refractive error
- B. To reduce cross-contamination and equipment damage
- C. To increase visual acuity
- D. To change corneal curvature
Answer and explanation
B. To reduce cross-contamination and equipment damage Correct processing protects patients from cross-contamination and prevents damage caused by incompatible products or methods.
How to Review Your Results
For every missed item, name the tested concept, explain why the correct option is best, and identify the clue that rules out each distractor. Then review the corresponding official content domain.