Cross Cylinder - Smart/Manual/Split Cyl Test; Cross Cylinder Test Settings; Examination For Astigmatism - Ametek Reichert Phoroptor VRx User Manual

Instructions for Use

Cross Cylinder - Smart/Manual/Split Cyl Test

If the XCyl Mode setting is "User Select," three test options display.
MANUAL - Refine Axis in 1°, 5°, or 10° increments, and adjust Cylinder in ±0.25 D, ±0.50 D,
•
or ±1.00 D increments.
• SMART - Automatically bracket Axis and Cylinder based on the amount of Cylinder in the
prescription.
SPLIT Cyl - Use a Split Cyl to present two targets simultaneously to refine Axis and Cylinder.
•

Cross Cylinder Test Settings

The Options/Setup menu settings allow the user to select one of the following button control options for
the Cross Cylinder test:
Blue Knob (Control Knob)
1. Press the CONTROL KNOB to select patient preference in the test ("which is better, 1 or 2?").
2. Press the ENTER button if the patient states that both charts are the same to advance to the
next step in the test (e.g., Axis to Cylinder).
Enter Button
1. Press the ENTER button to select patient preference in the test ("which is better, 1 or 2?").

Examination for Astigmatism

If the Cross Cylinder Mode (XCyl) is activated and a Cylinder value is not present, you need to perform
an Astigmatism check. The Astigmatism check automatically activates in each test mode when no
Cylinder power is present.
1. Turn the CONTROL KNOB to present the Cross Cylinder target at 0° and 90°.
2. Ask the patient "which is better, 1 or 2?"
• If the patient states a preference, turn the CONTROL KNOB to that number and press or
touch 1 or 2 on the screen.
• If the patient does not see a difference between the two charts, press the ENTER button or
touch EQUAL on the screen.
3. Ask the patient to compare two charts at 45° and 135°.
• If the patient states the charts are equal, no astigmatic correction is needed.
• If the patient has a preference, turn the CONTROL KNOB to that number and press or touch
1 or 2 on the screen.
Note: The test automatically advances to axis adjustment for the XCyl test that was selected.
Note: You can also adjust Sphere by touching the Sphere area in the data grid or pressing the S
button.
66
(continued)
16241-101 Rev. D