Huvitz CDR-9000 - Jackson Cross Cylinder Test

Digital Refractor CDR-9000 153
13.12. Jackson Cross Cylinder Test
-
Objective: To obtain the maximum corrected monocular CYL and AXIS values
during the subjective test using the Jackson Cross Cylinder.
-
Chart: Dots Group chart
-
Auxiliary Lens: Cross Cylinder Lens (025/050)
-
Expectation: The Dots Group Chart can be seen uniformly clear in spite of th
e up and down movement of the Cross Cylinder.
-
Operation Sequence:
1. Press the Dots Group Chart to enter the Cross Cylinder mode. Alternately,
press the [TEST] button and then select “Cross Cyl. Test-Axis” Item of the t
ouch screen to execute this test
2. Select the desired field by pressing the [R] or [L] button
3. Press [SHIFT] + [CC 025] OR [CC 050] button of the touch screen to chan
ge the type of Jackson Cross Cylinder lens
4. While pressing the button [1] and [2] alternately, ask the patient with whic
h button he/she sees clearer, “1” or “2”.
5. If the result of button [1] is seen more clearly, turn the dial counterclockw
ise (“+” direction).
6. If the result of button [2] is seen more clearly, turn the dial clockwise (“-”