Howell Phoria Cards

These cards allow direct measurement of the distance and near phorias in real space or with a phorpter. The patient simply has to tell which number the arrow points to. Any odd number (in yellow) shows esophoria while the even numbers (in blue) shows exophoria. An AC/A can quickly be determined with trial lenses.

Near card is about 12″ wide.
Distance chart is about 24″ wide.