The visual field test produces a computer printout of the light thresholds that the patientâs eyes were able to perceive and process (Fig. 2). The darkest areas of the test indicate a complete loss of vision in that area. The lighter the area, the more vision the patient has in that part of the eye.Figure 2. Visual field test of a patient with a meningioma shows vision loss (black areas) in half of the right eye, called hemaniopia.Visual field loss, also known as âvisual field cut,â can be partial or complete.he lighter the area, the more vision the patient has in that part of the eye. Figure 2. Visual field test of a patient with a meningioma shows vision loss (black areas) in half of the right eye, called hemaniopia.