Certified Paraoptometric (CPO) Practice Exam 2025

Which test is typically used to measure the visual field?

1. Tonometry

2. Perimetry

3. Keratommetry

4. Ophthalmoscopy

The correct answer is: Perimetry

The test that is typically used to measure the visual field is perimetry. This assessment evaluates a person's complete field of vision, allowing for the detection of any blind spots or areas with diminished vision. It is essential in diagnosing and monitoring conditions such as glaucoma, retinal disorders, and neurological issues that can affect the visual pathways. Tonometry measures intraocular pressure, which is important for glaucoma assessment but does not provide information about the visual field itself. Keratometry is focused on measuring the curvature of the cornea, primarily for contact lens fitting and assessing astigmatism. Ophthalmoscopy allows the examination of the interior structures of the eye, particularly the retina, but it does not measure visual field function. Therefore, perimetry is distinctly suited for evaluating the visual field, confirming that the provided answer is indeed correct.