Certified Ophthalmic Assistant Practice Exam

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Study for the Certified Ophthalmic Assistant Exam. Access multiple choice questions that reflect actual exam content and receive hints and explanations for each question. Prepare effectively and embark on your path to certification!

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What color is the light filter used in applanation tonometry?

Red
Green
Yellow
Blue

The correct answer is: Blue

The light filter used in applanation tonometry is blue. The blue light filter is chosen specifically because it enhances contrast against the yellowish appearance of the cornea, enabling better visibility during the measurement of intraocular pressure. This visibility is crucial for accurately determining the degree of corneal flattening that occurs during the tonometry procedure, leading to a more precise assessment of eye pressure. In the context of this procedure, other colors do not provide the same level of contrast and clarity needed for effective measurements. For instance, a red or yellow filter might not enhance the assessment since they do not create the optimal visibility needed against the corneal surface.