COT - Certified Ophthalmic Technician Exam

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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.

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