Purpose of Instrument
This instrument is used for examining the change of visual field which may be hurt by glaucoma, visual disease, disease of brain surgery and disease of retina.

Performance of Perimeter Scanner
Radius of stimulator: 300mm± 5%
Stimulating source of LED: Two visual lights: Yellow and red.
Stimulating strength: From 0 mcd to40mcd, have 14 degree to adjust, the error is± 10%.
Error of background brightness: 3lux± 10%
Light spot: Diameter is 2mm +/- 0.25mm.
The number of stimulating and the stimulating time:
A. 390 spots (Red light: 61spots, yellow: 329spots);
B: Stimulating retention time: 0.2s--3.0s, the program can adjust;
C: Stimulating spacing interval: 0.5s --3.0s, the program can adjust;
Window of eye-position tracking: White-black CCD, directly tracking the testing eye;
The length of chin rest: Up-down: ≥ 50mm; Right-left ≥ 28mm
Eye position tracking: When blinking, the system will alarm automatically.