Certified Ophthalmic Medical Technologist (COMT) 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 505

Are the mirrors on a Hertel exophthalmometer front surface or back surface mirrors?

Front surface

The mirrors on a Hertel exophthalmometer are categorized as front surface mirrors. This is crucial for the functionality of the device, as front surface mirrors reflect light without introducing distortion due to reflection from the glass itself, which can happen with back surface mirrors. The absence of a glass interface in the path of the reflected light allows for more accurate measurements of the distance between the corneal apex and the reference points on the device. This precision is essential for assessing proptosis or exophthalmos accurately, conditions that are often evaluated in ophthalmology for various clinical reasons including thyroid eye disease or orbital masses.

Understanding the mirror type is fundamental, as it influences measurement accuracy and reliability, which are key components in clinical practice and patient evaluation.

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Back surface

Both front and back surface

Neither

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