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5. OPERATION FOR TESTS
2 Check if the patient has heterophoria.
When the patient sees the test chart through the polarized filter, only the vertical lines
are seen with the right eye and only the horizontal lines, with the left eye.
If the patient does not have heterophoria, he/she sees the vertical line crossing the hori-
zontal line at the center.
If the patient has horizontal phoria, the vertical and horizontal lines are disassociated in
the horizontal direction in his/her vision.
If the patient has vertical phoria, the vertical and horizontal lines are disassociated in the
vertical direction in his/her vision.
3 Measure the horizontal phoria value.
If the patient has horizontal phoria, measure its value.
If the mouse operation mode is not set to "Horizontal prism", click the [H/V] button on the
control window to change the mode.
Ask the patient which direction the vertical line is in relation to the horizontal line, right or
left.
When the vertical line is disassociated to the left, click the left mouse button for the
mouse navigation until the vertical line reaches the center.
When the vertical line is disassociated to the right, click the right mouse button for the
mouse navigation until the vertical line reaches the center.
4 Measure the vertical phoria value.
If the patient has vertical phoria, measure its value.
Click the [H/V] button on the control window to change the mouse operation mode to
"Vertical prism".
Ask the patient which direction the horizontal line is in relation to the vertical line, upward
or downward.
When the horizontal line is disassociated upward, click the left mouse button for the
mouse navigation until the horizontal line reaches the center.
When the horizontal line is disassociated downward, click the right mouse button for the
mouse navigation until the horizontal line reaches the center.
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