Operation Manual
50
6.4. Red-green mask
Select any optotype chart.
1. Press to activate mask.
2. If you have red-green mask active you can still use Arrows to change
optotypes.
3. Press again button to change the colour of the mask.
4. Press again to deactivate mask.
Red-green mask can be used only with optotype charts.
You can not display red-green mask over chart with only one
optotype.
Pic. 21 Red-green mask
WARNING !
WARNING !
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