172 Digital Refractor CDR-9000
If you make use of an old-fashioned chart projector or a mirror chart n
ot supporting the Von Graefe Chart, you can imitate the horizontal Von
Graefe chart as follows;
1. Spread a general chart readable to patient such as number, Landolt
2. Press the vertical mask button to leave only one row.
3. Press the [BIBO] button to place the horizontal rotary prism.
4. Select the 6△auxiliary lens in the Lens dialogbox.
Note that if you are to use this method, you can neither record extra
phoria test result nor refer to the guide window.
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