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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Which instrument is used to measure the curvature of the central part of the cornea?

Lensmeter
Sphygmomanometer
Keratometer
Retinoscope

The correct answer is: Keratometer

The keratometer is specifically designed to measure the curvature of the cornea's central part, making it the appropriate instrument for this task. It operates by projecting a series of illuminated rings onto the cornea and analyzing the reflection of these rings, allowing for precise measurement of the corneal shape. This data is crucial in various applications, including fitting contact lenses, pre-surgical assessments for procedures like LASIK, and diagnosing corneal conditions. In contrast, other instruments have different purposes: the lensmeter is used to measure the prescription of lenses; the sphygmomanometer is designed for measuring blood pressure; and the retinoscope evaluates the refractive error of the eye rather than the cornea's curvature. Thus, the keratometer stands out as the correct choice for measuring corneal curvature.