Fig. 28. Screening programs, such as the Humphrey Field Analyzer full-field 120-point screening test, can help acquaint patients with perimetry while providing an initial overall assessment of the visual field status. They may also be useful in identifying visual field defects that fall outside of the central 30 degrees. This test shows the peripheral extension of the superior nasal step defect from the same eye as the 30-2 test in Figure 19.