The Humphrey Visual Field analyser is an industry standard test which allow us to look for defects in the sensitivity of the eye. For example, the central vision of the eye may be good, but the periphery of the visual field may be severely damaged. It is important to detect change in the visual field in order to maintain the function of the eye. As a good eye is able to compensate for poor vision in the other eye, the effects of visual field damage are often unnoticed by the patient until there is significant damage to the vision. The Humphrey visual field test is designed to pick up the earliest changes to the function of the eye.
The test works by displaying flashes of light around a bowl with a fixed background light level. The machine aims to find the dimmest light that the eye is able to detect at various locations in the visual field.
The Humphrey Visual Field Analyser has become an industry standard machine for the diagnosis and monitoring of glaucoma and other ocular and neurological diseases. Like all visual field tests, the machine tests the patient's response to a visual stimulus. The machine may be set to run one of many optimised programs.