Potec PLC-8000 - Page 38

- 30 -
● Horizontal line
- Use : To detect vertical phoria(Von Graefe test)
- Auxiliary lens : 10△BI to the right eye
- Ideal appearance :
Right eye Left eye Binocular ideal
● When the two rows are not in line, see the table below to reduce the amount of shift
Subject`s vision Phoria Correction
<1> The left row is higher
Right eye
hyperphoria
Add the BD prism power to the right
eye until the rows line up.
<2> The right row is higher.
Left eye
hyperphoria
Add the BU prism power to the right
eye until the rows line up.
● Vertical line
- Use : To detect horizontal phoria(Von Graefe test)
- Auxiliary lens : 6△BU to the right eye
- Ideal appearance :
Right eye Left eye Binocular ideal