COT - Certified Ophthalmic Technician Exam - COT - Certified Ophthalmic Technician Exam

Question 1

A technician performs applanation A-scan biometry and obtains an axial length of 22.50 mm. The same eye is then measured using immersion A-scan, yielding a measurement of 22.85 mm. What is the most likely reason for this discrepancy?

Misalignment of the probe off the visual axis during applanation. Incorrect sound velocity setting for the crystalline lens. Corneal compression from the applanation probe. Patient blinking excessively during the immersion scan.

Correct Answer:

Corneal compression from the applanation probe.

Question 2

When evaluating an A-scan waveform for accuracy, which of the following represents the ideal characteristics for the retinal spike?

A short, broad spike followed immediately by a series of smaller spikes. A tall, steeply rising spike that is perpendicular to the baseline. A spike that is less than 50% of the height of the anterior lens spike. A notched or double-peaked spike just before the orbital fat signals.

Correct Answer:

A tall, steeply rising spike that is perpendicular to the baseline.

Question 3

An ophthalmologist is selecting an IOL formula for a patient with a very short axial length of 21.2 mm. Which of the following formulas has traditionally been preferred for this type of eye?

Hoffer Q SRK/T Binkhorst SRK II

Correct Answer:

Hoffer Q

Question 4

During an A-scan measurement, the technician fails to identify a distinct posterior lens capsule spike, and the lens thickness value appears abnormally large. This is most characteristic of:

A patient who is aphakic. Misalignment onto the optic nerve head. A dense posterior subcapsular cataract. Excessive gain setting on the machine.

Correct Answer:

A dense posterior subcapsular cataract.

Question 5

A technician is preparing to perform an A-scan on a patient whose vitreous cavity is filled with silicone oil. Which of the following is the most critical machine setting to adjust for an accurate axial length measurement?

The signal gain amplification. The patient's keratometry values. The measurement mode (manual vs. automatic). The sound velocity setting.

Correct Answer:

The sound velocity setting.

Exam overview

About this Exam

Prepare with the COT - Certified Ophthalmic Technician Exam practice quiz. This question bank includes 199 questions covering patient, technician, lens, performing, and a-scan. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

More details

Additional Information

COT - Certified Ophthalmic Technician Exam

This practice set contains 199 questions from the matching question bank and focuses on patient, technician, lens, performing, and a-scan. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

Quiz information

Frequently Asked Questions

The complete question count is available after full access is unlocked.

No fixed duration is currently configured for this quiz.

Question explanations are included where they are available in the quiz content, helping you review the reasoning after answering.

Yes. You can retake the practice test again as you continue studying during your available access period.

After your access is confirmed, you can continue into the complete practice exam from this quiz flow.

Unless explicitly stated otherwise, this page provides independent practice material for study and exam preparation and is not the official examination itself.

Correct Answer:

Correct Answer:

Correct Answer:

Correct Answer:

Correct Answer:

About this Exam

Additional Information

COT - Certified Ophthalmic Technician Exam

Frequently Asked Questions

Related Questions

ISC2 Certified in Cybersecurity Practice Exam

310T Truck and Coach Technician Exam

Arizona CNA Certified Nursing Assistant Practice Exam

Certified Professional Public Buyer (CPPB) Practice Exam

A&P Mechanic Technician Practice Test

Certified Specialist Business Intelligence (CSBI) Practice Test