Certified Ophthalmic Technician (COT) Practice Test 2025 - Free COT Practice Questions and Study Guide

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How many dimensions does an A-scan produce in its display?

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An A-scan, or amplitude scan, produces a one-dimensional display. It represents a single line of information showing the distance to various interfaces within the eye, particularly the cornea, lens, and retina. In this format, the X-axis typically denotes the time or distance, while the Y-axis indicates the amplitude of the reflected echo from the structures being measured.

Although additional data may be processed or visualized in more complex ways, such as through B-scans (which provide two-dimensional images), the primary output of an A-scan remains one-dimensional. This simplicity makes A-scans particularly useful for measuring axial length and determining various anatomical distances within the eye.

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