Potec PLC-8000 - Page 39

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● When the two column are not is line, see the table below to reduce the amount of shift.
Subject`s vision Phoria Correction
<1> The upper column is on the left.
Esophoria Add the BO prism power to the left eye
until the two columns line up.
<2> The upper column is on the right.
Exophoria Add the BI prism power to the left eye
until the columns line up.