PDR-7000 Operation Manual
4.10 Positive Relative Convergence Test
Use: To measure the Positive Relative Convergence test during the subjective test.
Chart: Near Distance chart
Auxiliary lens: None
Expectation: To obtain BLUR and RECOVERY value for the right or left eye or for
both eyes.
[Operation sequence]
1. Press the [FAR] or [NEAR] button of the touch screen to select near or far
mode.
2. Press the button and then click the button at the left of the bottom on
the screen in FAR vision mode.
3. Press the (prism in/out) button of control box and then click the
button at the leftmost of the bottom on the screen in NEAR vision mode.
4. In the far mode, horizontal Von Graefe Chart will be spread on the screen. In
the Near Mode, lower the Von Graefe chart until it is placed to 40cm away
position from the patient’s eye so that the patient could see this chart.
5. After pressing the [BLUR] button of the touch screen, turn the dial clockwise("-"
direction) to subtract the BO prism. Press the [BREAK] button of the touch
screen by the time the chart starts to fade away. If there is no such spot and the
chart appears to be divided into two, continue the test.
6. Continuously turn the dial clockwise("-" direction) to subtract the BO prism.
Press the [RECOV] button of the touch screen by the time the chart is divided
into two.
7. At this time, turn the dial counterclockwise("+" direction) to add the BO prism.
Press the [SAVE] button of the touch screen when the charts come together. All
done.
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