ABSTRACT
Inaccurate visual field results can be documented for a variety of reasons and ensuing errors of interpretation can have serious consequences for the diagnosis and ultimately the management decisions for the individual patient. Artefacts of visual field results may relate to the instructions given to the patient, the set-up of the patient at the instrument or the patient’s ability to perform the visual field assessment. Patients perform well during the early stages of the test with central test locations but performance reduces as the test progresses and as patients fatigue. Hysteria is a neurosis and patients may complain of an inability to see small detail or read or perhaps a marked visual field defect. Miosis depresses the visual field and can exaggerate the size and depth of existing visual field defects. Uncorrected or inappropriately corrected refractive errors can lead to enlarged blind spots on visual field assessment and constriction of visual field, particularly the central visual field function.
