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6.2.5 Introduction of function key button
Remote control key
button icons
Function
Switch key: Turn on or off the LCD displayer.
Help function
Setting function key
return key
Left-right selection key: When single chart displays or charts display in
column, press this key to shift the chart left or right on the same visual chart.
Up-down selection key: When visual charts display, press this key to display
last or next screen of visual charts. When single chart displays or charts
display in column, press this key to shift the chart up or down on the same
visual chart.
Function confirmation key: 1) Operation confirmation; 2) Color blind test,
display answer; 3) Astigmatic disc mark, display red dot mark
Row display key: Press this key to shift between row charts and all charts:
press once to display row chart, press again to display all charts.
Column display key: Press this key to shift between column charts and all
charts: press once to display column chart, press again to display all charts.
Single display key: Press this key to shift between single chart and all charts:
press once to display single chart, press again to display all charts.
Press this button to rearrange optotypes randomly on the visual chart.
Reserved function key
Reserved function key
Night vision test button: low brightness test, convenient for night vision test
Pressing it one time to display ETDRS format, pressing it again to go back to
standard format.
