Axis Adjustment; Cylinder Power Adjustment - Ametek Reichert Phoroptor VRx User Manual

Instructions for Use
Cross Cylinder - Split Cyl Test

Axis Adjustment

4. Touch the screen icon at the bottom left of the screen that indicates the degree of Axis change.
• The degree of Axis change increments are 1°, 5°, or 10°.
• Touch the icon repeatedly to cycle through the different increments.
5. Ensure that the patient can see the red and green sides of the Split Prism lens.
6. Ask the patient: "Which is better (sharper and clearer), the red or the green?"
7. Press the RED or the GREEN button, or touch RED 1 or GREEN 2, based on the patient's
response.
8. Repeat steps 3 and 4, until the patient sees the two test chart images equally clear or equally
blurry.
9. Press the ENTER button, or touch EQUAL, to save the Axis value.
Note: Axis is freely adjustable by turning the CONTROL KNOB.

Cylinder Power Adjustment

Once the Axis adjustment is complete, the Split Prism Cross Cylinder test automatically advances to the
Cylinder power adjustment.
1. Touch the ±0.25 D, ±0.50 D, or ±1.00 D screen icon at the bottom left of the screen to change
the Cylinder power values.
2. Ask the patient: "Which is better (sharper and clearer), the red or the green chart?"
3. Press the RED or the GREEN button, or touch RED 1 or GREEN 2, based on the patient's
response.
4. Repeat steps 2 and 3, until the patient sees the two test chart images equally clear or equally
blurry.
5. Press the ENTER button, or touch EQUAL, to save the Cylinder value. This completes the Split
Cyl Cross Cylinder test.
Note: When the patient has Sphere power equal to or greater than -12.25 D or 7.75 D, the Split
Cyl test does not activate.
Note: Cyl is freely adjustable by turning the CONTROL KNOB.
Note: For all Split Cyl test, you can also adjust Sphere by touching the Sphere area in the data
grid or pressing the S button.
16241-101 Rev. D
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