PDR-7000 Operation Manual
4.5.6 Von Graefe test (vertical phoria)
Use: To detect vertical phoria
Chart: Horizontal line
Auxiliary lens: Rotary prism to the right eye, 10ΔBI to the left eye
Applicable model: PACP-7000, PACP-7000L, PLC-7000, PLC-7000pola,
PLC-7100, PLC-7100pola, PLC-8000, PLC-8000pola
[For the other types, use the highest VA letter chart or the letter
chart which is little higher than the patient’s VA.]
Ideal appearance:
Right eye Left eye Binocular ideal
[Procedure example]
1. Present the horizontal line chart.
Press the horizontal line chart.
10ΔBI prism lens is placed in the left measuring window.
The base up/down prism powers can be entered.
2. Ask the patient, “Can you see two circles with a row of letters in each of them?
Do the letters line-up, like headlights on a car?”
When they are not in line, correct them as follows:
Appearance of chart Phoria Correction
1) The left row is higher.
Right eye
hyperphoria
Turn the dial counterclockwise until the two rows
line up.
2) The right row is higher.
Left eye
hyperphoria
Turn the dial clockwise until the two rows line up.
Use or instead of the dial for fine adjustment.
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