Digital Refractor CDR-9000 141
ear Cross Grid chart at 40cm. Alternately, press the [TEST] button and the
n select “Near ADD” of the touch screen to execute this test.
2. Press the [R], [L], [OU] button to select the field to measure.
3. Change the ADD value till the horizontal and vertical rods have the same
clarity and width. Write down each result for the right and left eye and fo
r the both eyes.
4. Turn the dial clockwise (“-“ direction) if the vertical bar is seen more clearl
y.
5. Turn the dial counterclockwise (“+” direction) if the horizontal bar is seen
more clearly.
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