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② Red/Green button: Applies the Red/Green filter to the chart
③ Chart/Slide button: Chart-Slide-Movie condition of the chart
④ Slide Show button: Displays the slide show of the image
⑤ CTRS button: Selects the contrast of charts.
⑥ Reverse button: Reverses the black-and-white condition of the chart.
⑦ Chart On/Off button: Turns the monitor on or off
⑧ Chart Menu/Save button: Chart type, Distance, Beep sound, Mirror, Power Save
Time, Slide Show, Brightness, Auxiliary Chart Type, Background Gray Color Screen,
Video Progressive Bar Display, Filter Red/Green, BackGround Gray, Image update,
Reset of setting button
⑨ ETDRS button: Display ETDRS A, ETDRS B ETDRS C
⑩ RANDOM button: Used to arrange the targets at random and present them.
⑪ Single Mask button: Pressing the button toggles between entire chart and single line
display
⑫ BACK button: It used to cancel in Menu function.
⑬ Horizontal Mask button: Pressing the button toggles between entire chart and
horizontal line display
⑭ Vertical Mask button: Pressing the button toggles between entire chart and vertical
line display
⑮ Mask button: Moves the display to a higher or lower VA value when a single mask,
vertical line, or horizontal line is isolated on the VA chart.
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