LED
                            ZN-215:21.5-inch TFT Panel, 1920x1080 pixels
Brightness..............................................................250CD/m²
Optotype…..........…E, C(Landolt),Alphabet, Numbers, Chi ldren
Visual unit….............Decimal,Snel len(ft,20/20),Snel len(m,6/6)
Distance………………………….......…1M~6M (in steps of 0.1m)
Mask type….........Single mask, Horizontal mask, Vertical mask,  
                                               Red/Green mask, White/Black mask,
                                 Contrast adjustment, Red/Green adjustment
Special test masks……....Ishihara, Cross cyl inder, Astigmatism, 
                         Cross Grid, Fixation point Test, Red/Green Panel, 
                                 Worth Test, Red/Green Balance, Traffic l ight, 
                   Coincidence Test, Stereo Test, Schober Test, ETDRS
Other functions…...Ramdomization Optotypes Playing function, 
                                  R/G setting function, Video playing function, 
                                         Screen-saver function, standby function 
 moniter........ZN-185:18.5-inch TFT Panel, 1366x768 pixels  
SPECIFICATIONS