Certified Paraoptometric (CPO) Practice Exam 2025

Tonometry is the correct answer because it specifically refers to the method of measuring intraocular pressure (IOP) within the eye. This measurement is crucial for assessing conditions like glaucoma, where elevated IOP can lead to optic nerve damage and vision loss. Tonometers can use several techniques, such as applanation or non-contact methods, to provide accurate measurements that help eye care professionals monitor and manage eye health.

The other options relate to different aspects of eye examination and do not measure eye pressure. Perimetry is focused on visual field testing, helping to identify peripheral vision loss. Ophthalmoscopy is used to examine the internal structures of the eye, especially the retina and optic nerve head. Electroretinography evaluates retinal function by measuring the electrical responses of the retina to light stimulation. Each of these exams serves a different purpose in eye care and does not involve the measurement of intraocular pressure.