Division Description Test method
Phoria test -
(Fixation point of
cross phoria)
This test is for
measuring
vertical/horizontal
fixation disparity of
right or left eye by
using Red/Green
filter.
1. Show cross phoria test type to a patient.
2. Let a patient wear Red/Green glasses (right eye = red filter, left
eye = green filter). The patient sees « » mark in a right eye and
« » mark in a left eye on cross phoria test type. The binocular
condition would be ideal, if the patient could see « » mark.
3. Judge a patient's binocular function as below, while asking him
how the type is seen.
Patient's
visual status
Fixation disparity Method
Esodisparityⓐ
Add B.O prism until being no
deviation.
Exodisparityⓑ
Add B.I prism until being no
deviation.
Left eye's ⓒ
hyperdisparity
Right eye's
hypodisparity
Add B.U in a right eye or B.D
in a left eye until being no
deviation.
Right eye's ⓓ
hyperdisparity
Left eye's
hypodisparity
Add B.U in a left eye or B.D
prism in a right eye until
being no deviation.
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