COT - Certified Ophthalmic Technician Exam

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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.

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