PDR-7000 Operation Manual
4.5.13 Maddox test (vertical phoria)
Use: To detect vertical phoria
Chart: Fixation
Auxiliary lens: Rotary prism to the right eye, vertical maddox rod to the left eye
Ideal appearance:
Right eye Left eye Binocular ideal
1. Present the fixation chart.
Press
The horizontal maddox rod is set in the right measuring window.
The base in/out prism powers can be entered.
2. Press again.
The maddox rod is removed from the right measuring window and the vertical maddox
rod is placed in the left measuring window.
The base up/down prism powers can be entered.
3. Ask the patient “Is the white spot above or below the red bar? Or, it is overlaid
on the red bar?”
When the spot is shifted upward or downward, correct it as follows:
Appearance of Chart Phoria Correction
1) The white spot is above
the red bar.
Left eye
hyperphoria
Press Turn the dial clockwise to
add the BU prism power until the spot is
overlaid on the red bar.
2) The white spot is below
the red bar.
Right eye
hyperphoria
Press Turn the dial
counterclockwise to add the BD prism power
until the spot is overlaid on the red bar.
Use or instead of the dial for fine adjustment.
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