Instructions for Use (continued)
Cross Cylinder - Manual Test (continued)
4. Turn the CONTROL KNOB to present position 1 and position 2 to the patient. The direction of
the Axis change is indicated in the lens aperture at the top of the screen.
5. Ask the patient: “Which is better, 1 or 2?”
6. Change the Cylinder Axis to this preferred direction when the patient states a preferred position.
7. Press the CONTROL KNOB, or touch the NUMBER on the screen (1 or 2), to enter the patient’s
preferred selection.
8. Repeat steps 3 - 6, until Chart 1 and Chart 2 are equally clear or equally blurry.
9. Press the CONTROL KNOB, or touch EQUAL on the screen, to advance to Cylinder power
adjustment.
Note: You can Undo a step in the Cross Cylinder test by touching the UNDO screen icon at the
bottom left of the screen.
Note:
You can also adjust Sphere by touching the Sphere area in the data grid or pressing the
S button.
Freely Selectable Axis Adjustment
It is possible to adjust axis beyond whatever increment was selected for the axis adjustment (1°, 2°, 5°,
10°, 20°). Turn the CONTROL KNOB 8 click stops in one direction when offering position 1 or 2 to the
patient. After the 8
th
click stop, the axis changes in 1° increments. This allows the user to freely modify
the axis in that direction.
68 16241-101 Rev. D
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