PDR-7000 Operation Manual
11- 4.
Isolates a horizontal line in the middle of the VA chart.
- + : Applies the red-green filter on the VA chart.
- + again : Releases the red-green filter.
12. Program keys
See “2.5 Standard Program Refraction” for programmed refraction.
12- 1.
Starts a program.
- Pressing this key again restarts the program.
- + : Switches the program between FixA, B and userA~H.
12- 2.
Used to forward next programmed refraction sequence.
- + : Returns to the previous sequence.
13. Cross cylinder keys
Place a cross cylinder lens to measure the cylindrical axis or power. when the key is
pressed with both eyes open, the left measuring window is occluded automatically.
Open the left measuring window with to perform the astigmatism test with both
eyes open.
It is possible to select the cross cylinder lens to be inserted with the Cross cylinder
(XC) test parameter.
When the parameter is set to ±0.25 or ±0.50, the cross cylinder lens is inserted as
follows.
13- 1.
In the cylindrical axis measurement, the cross cylinder lens is inserted so that the
minus axis is located at 45° from the minus axis position of the cylindrical lens.
In the cylindrical power measurement, the cross cylinder lens is inserted so that the
minus axis is located at 90° from the minus axis position of the cylindrical lens.
Clears the prism data for the right eye in prism entry mode.
13- 2.
In the cylindrical axis measurement, the cross cylinder lens is inserted so that the
minus axis is located at 135° from the minus axis position of the cylindrical lens.
In the cylindrical power measurement, the cross cylinder lens is inserted so that the
minus axis is located at 0° from the minus axis position of the cylindrical lens.
14. Value change keys
Functions as the same as the dial.
14-1.
Increases the value to the positive side in increments of one.
14- 2.
Decreases the value to the negative side in increments of one.
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