Humphrey field analyser (HFA) is a tool for measuring visual field and is used for detecting monocular visual field but can be used for screening, monitoring and assisting in the diagnosis and monitoring of certain conditions such as glaucoma and brain lesions.

Method of assessment

The Analyser test takes approximately 5-8 minutes per eye, excluding patient set up. The patient is instructed to maintain fixation on the central target and is given a buzzer to only press when they see a light stimulus. It is not possible to see every light and some lights appear brighter/duller and slower/faster than others. This assesses the retina’s ability to detect a stimulus at specific points within the visual field.