PDR-7000 Operation Manual
O Vertical phoria correction
1. Present the vertical coincidence chart.
Press
The polarizing filters are placed in the measuring windows.
The base up/down prism powers can be entered.
2. Ask the patient, “Can you see a square with a dot in the center? Are the left and
right frames aligned? Or, is one higher than the other?
When they are not aligned, correct them as follows:
Appearance of chart Phoria Correction
Right eye
hyperphoria
Press . Turn the dial counterclockwise until
the left and right frames are aligned.
(Add BD to the right eye and BU to the left
eye.)
Left eye
hyperphoria
Press . Turn the dial clockwise until the left
and right frames are aligned.
(Add BU to the right eye and BD to the left
eye.)
Use or instead of the dial for fine adjustment.
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