Huvitz CDR-9000 - Red;Green Test

Digital Refractor CDR-9000 151
13.11. Red/Green Test
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Objective: To verify the maximum corrected monocular SPH value during the
subjective test using the Red/Green chart.
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Chart: Red/Green chart
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Auxiliary Lens: None
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Expectation: The letters on the red and green ground can be seen uniformly
clear.
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Operation: Sequence:
1. Change into the Red/Green mode by pressing the Red/Green chart. Altern
ately, press the [TEST] button and then select “ Red/Green Test ” Item of t
he touch screen to execute this test
2. Select the desired field by pressing to the [R] or [L] button.
3. Apply fog if necessary and increase the SPH value by about 0.5D
4. Change the SPH value till the letters on the red ground can have uniform
clarity and thickness in the same level as those on the green one.
5. If the letters on the red ground (left) are seen more clearly, turn the dial
clockwise (“-“ direction)
6. If the letters on the green ground (right) are seen more clearly, turn the d
ial counterclockwise (“+“ direction)