What is the correct definition of perimetry?

Perimetry is defined as a technique for measuring peripheral vision, which is essential for assessing a patient's visual field. This evaluation helps identify any visual field defects, such as those caused by glaucoma, neurological disorders, or retinal diseases. During a perimetry test, a patient is usually asked to detect lights or objects presented at various angles in their peripheral visual field, thus allowing for a comprehensive assessment of how well they can perceive stimuli outside their central vision.

By determining the extent and sensitivity of the peripheral visual field, clinicians can gather crucial information about the health of the patient's eyes and the functioning of the visual pathways in the brain. Understanding peripheral vision is vital in diagnosing and managing conditions that could compromise a patient's overall visual function and quality of life.