Confrontation Fields - the gross examining technique. The target is then moved in from the periphery by the examiner, and the examiner compares the patient's field to the examiner's field. Tangent Screen - a black felt screen mounted on the on wall, with meridians, degrees from fixation and blind spot stitched in black thread. The black pointer is used to introduce white targets. The room illumination is standardized.
Patients wear full distance correction and one eye is occluded.
One or two meters are used for variable testing distance. When testing at one meter the blind spot is closer to fixation. At two meters the blind spot is further from fixation. When moving from one to two meters, the target size needs to be doubled to maintain the same isopter size. This is an excellent tool for testing malingering or hysterical patients.