Assessment of Visual Field Anomalies Using the Visually Evoked Response

A.Fitzgerald, DipO (Cumb), DOBA
P.Montgomery, BE (Elec)
F.Billson, FRACO, FRACS

A study was performed to assess visual fields using the Visually Evoked Response (VER), by both check and flash methods.
Ten normal subjects were tested using simulated defects, and subsequently patients with various field defects were assessed. Characteristically abnormal VER responses were found for several gross field defects, especially hemianopia, central scotoma and tunnel vision. Smaller defects such as quadrantinopias were assessable by the check VER only but they require more careful interpretation of the results.
The value of using the VER as an alternative method of visual field assessment, with the mentally retarded, geriatric and uncooperative patient is demonstrated.