Certified Paraoptometric (CPO) Practice Exam 2025

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What instrument is best suited for measuring the pressure inside the eye?

Goldman tonometer
Keratometer
Phoropter
Indirect ophthalmoscope

The correct answer is: Goldman tonometer

The correct instrument for measuring the pressure inside the eye is the Goldmann tonometer. This device is widely recognized for its accuracy and reliability in assessing intraocular pressure (IOP), which is a critical factor in diagnosing and managing conditions such as glaucoma. The Goldmann tonometer works by applying a known force to the cornea and measuring the resulting deformation, allowing for a precise calculation of eye pressure. This method is considered the standard in clinical practice and provides essential information about the health of the eye. The other instruments mentioned serve different purposes. A keratometer is designed to measure the curvature of the cornea, which is important for fitting contact lenses and assessing corneal conditions. A phoropter is used during refraction to measure a patient's refractive error and determine the necessary corrective lenses. An indirect ophthalmoscope is utilized to examine the interior of the eye, particularly the retina, but does not measure intraocular pressure. Each of these instruments plays a vital role in eye care, but the Goldmann tonometer is specifically intended for monitoring eye pressure.