Certified Ophthalmic Medical Technologist (COMT) Practice Exam

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What is the term for ensuring that the patient's PD is located in the correct position within the frame chosen by the patient?

Alignment
Decentration
Adjustment
Fit

The correct answer is: Decentration

The correct term for ensuring that the patient's pupillary distance (PD) is positioned accurately within the chosen frame is decentration. This practice involves aligning the optical centers of the lenses with the patient’s pupils, as any misalignment can lead to visual discomfort or distortion. Proper decentration aligns the lens center with the visual axis of the eye, which is crucial for optimal vision and helps prevent issues such as prismatic effect or unnecessary strain while wearing the glasses. When choosing a frame, it is important to measure how the lenses will be oriented relative to the patient's eyes. If the PD is not appropriately accounted for in the lens design relative to the frame, it leads to uneven prescription distribution and could potentially compromise the effectiveness of the lenses.