Certified Ophthalmic Medical Technologist (COMT) Practice Exam

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Cleaning which filter on the keratometer improves mire imagery?

  1. The infrared filter

  2. The daylight blue filter

  3. The polarizing filter

  4. The UV filter

The correct answer is: The daylight blue filter

Cleaning the daylight blue filter on the keratometer is essential for improving mire imagery. The daylight blue filter is designed to eliminate unwanted reflections and enhance contrast in the mire patterns used during keratometry readings. When this filter is clean, it allows for clearer visual cues, which helps in accurately assessing the corneal curvature necessary for contact lens fitting or surgical planning. Proper visibility of the mire pattern is crucial, as it enables the technician or clinician to take precise measurements of the eye's surface. This improved clarity also aids in reducing artifacts that can occur due to dust or smudges on the filter, which could lead to misinterpretation of the measurements. In contrast, while other filters like the infrared, polarizing, and UV filters serve specific functions, they do not play a significant role in enhancing the visibility of mire patterns, thus making the use of the clean daylight blue filter the most relevant for this purpose.

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