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SECONDARY TEST SLIDE (1000-21)
LATERAL PHORIA
1. Test #3
2. Right Eye Illuminated
3. Left Eye Occluded
Left Eye Right Eye
Ask the subj
ect, "Do you see a series of musical notes?" If the subject
does, ask, "How many?" The answer is 15. Tell the subject a white arrow
will appear. Simultaneously turn LEFT switch ON. Ask the subject, "The
arrow is pointing to which note?" An immediate response is desired.
The Lateral Phoria Test measures the relative posture of the eyes in the
horizontal plane. The arrow pointing to #8 is the ideal orthophoric, but the
arrow anywhere between #3 ½ and #12 ½ is within the accepted norms.
• Each number represents one(1) prism diopter of power.
• Exophoric scores are measured from note #8 to #15.
• Esophoric scores are from note #1 to #8.
NOTE: This test cannot be given to a subject with vision in only one eye.
This is a binocular test only.
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