1. A method of objectively characterizing a patient's visual field, comprising: repeating steps a and b for a plurality of varying contrast levels and a plurality of corresponding patient response signals: a) presenting a visual field test pattern to the patient using an electronic display device, the visual field test pattern presented at a contrast level selected from the plurality of varying contrast levels; b) receiving a corresponding patient response signal; and generating a characterization of the patient's visual field using the plurality of contrast levels and the plurality of corresponding patient response signals.