Visual field testing is an examination used to assess alterations in the visual field (the portion of space the eye can perceive while focused on a central point).
This test detects any loss of peripheral vision and produces a map of this loss, which guides and assists in diagnosing certain pathologies (glaucoma, retinal diseases, optic pathway lesions, etc.).
During this exam, the patient sits facing the perimeter (a device with a spherical interior). Each eye is tested independently, so one eye is kept closed while the examiner asks the patient to indicate when they see a flashing light of varying intensities. This light flash appears in different areas of the tested eye’s visual field. The same procedure is then repeated for the other eye.
This study is completely painless, has no contraindications, and requires no prior preparation by the patient.