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Screen On/Off Mode select ETDRS/Snellen Activate/deactivate fixation point Modify number of lines and/or symbols Change type of optotype Add/Remove Red&Green background Contrast On/Off Decrease contrast Increase contrast Increase size Decrease size Decrease number of letters per line Increase number of letters per line Resample optotypes Show/Hide sizes Open menu
  1. Screen On/Off.
  2. Mode select.
  3. ETDRS/Snellen.
  4. Activate/deactivate fixation point.
  5. Modify number of lines and/or symbols.
  6. Change type of optotype.
  7. Add/Remove Red&Green background.
  8. Contrast On/Off.
  9. Decrease contrast.
  10. Increase contrast.
  11. Increase size.
  12. Decrease size.
  13. Decrease number of letters per line.
  14. Increase number of letters per line.
  15. Resample optotypes.
  16. Show/Hide sizes.
  17. Open menu.