What is the primary purpose of perimetry?

The primary purpose of perimetry is to measure the expanse and sensitivity of peripheral vision. This test is crucial in diagnosing and monitoring various eye conditions, such as glaucoma and other retinal diseases, which can often affect peripheral vision before central vision is impacted. During a perimetry test, patients typically look at a central target and indicate when they see lights presented in their peripheral field. This helps establish a visual field map, which can reveal blind spots or areas where vision is diminished.

Understanding peripheral vision is important for activities of daily living and overall visual function. Detecting changes in peripheral vision can be an early indicator of disease progression, making perimetry a valuable tool in ophthalmic evaluations and assessments.