Fig. 1From: Simplified automatic method for measuring the visual field using the perimeter ZERK 1The perimeter ZERK 1: a Schematic diagram, b Image of the created perimeter. The numbers indicate: 1 central fixator, 2 LEDs, 3 eye tracking, 4 vertical arm, 5 horizontal arm, 6 base, 7 vertical guides, 8 computer with dedicated softwareBack to article page