YYT703 Mask Vision Field Tester
A low-voltage bulb is installed at the eyeball position of the standard head shape, so that the stereoscopic surface of the light emitted by the bulb is equal to the stereoscopic angle of the average field of vision of Chinese adults. After wearing the mask, in addition, the light cone was reduced due to the limitation of the mask eye window, and the percentage of saved light cone was equivalent to the visual field preservation rate of standard head type wearing mask. The visual field map after wearing the mask was measured with a medical perimetry. The total visual field area of the two eyes and the binocular field area of the common parts of the two eyes were measured. The corresponding percentages of the total field of vision and binocular field of vision can be obtained by correcting them with correction coefficient. The lower field of vision (degree) is determined according to the position of the lower crossing point of the binocular field map. Compliance: GB / t2890.gb/t2626, etc.
This manual contains operating procedures and safety precautions. Please read carefully before installing and operating your instrument to ensure safe use and accurate test results.
2.1 safety
Before using sgj391, please be certified to read and understand all the usage and electrical safety.
2.2 emergency power failure
In case of emergency, unplug the power supply of sgj391 plug and disconnect all power supplies of sgj391. The instrument will stop the test.
Radius of semicircular arc arch (300-340) mm: it can rotate around the horizontal direction passing through 0 ° of it.
Standard head shape: the top line of the light bulb of the pupil position device is 7 ± 0.5mm behind the midpoint of the two eyes. The standard head form is installed on the workbench so that the left and right eyes are respectively placed at the center of the semicircular arc arch and directly look at its "0" point.
Power supply: 220 V, 50 Hz, 200 W.
Machine shape (L × w × h): about 900 × 650 × 600.
Weight: 45kg.
