95
D
D
i
i
g
g
i
i
t
t
a
a
l
l
R
R
e
e
f
f
r
r
a
a
c
c
t
t
o
o
r
r
E
E
D
D
R
R
7
7
8
8
0
0
0
0
10.21
10.21
10.21
10.21
Phoria Test without Fixation
Purpose: In subjective test, progress Heterophoria test in a way of Pola Cross without
Fixation.
Chart: Polarized Cross Chart without Fixation
Auxiliary Lens: Polarized Filter with 135 degrees for right eye, and 45 degrees for left eye.
Target: The vertical seen with the right eye and the horizon seen with the left eye are united
and seen as cross.
Way of Test
1. On Special Chart clause of touch screen,
enter Heterophoria Mode by pressing Pola
Cross Chart without Fixation.
2.
Ask the patient, “Does it seem like a cross?”
▶
If the answer is “Yes”, there is no Heterophoria. Test done.
▶
If the answer is “No”, it is Heterophoria. Process the next test.
3. To
start with Horizontal Heterophoria test, ask the patient as following.
4.
“Does the letter (
) locate on the left side of the letter (
), or the right side of it?”
▶
Located on left: “ Exophoria.” Turn the dial counterclockwise to increase BI prism, until the
cross is seen well.
▶
Located on right: “Esophoria.” Turn the dial clockwise to increase BO prism, until the cross is
seen well.
5. To
start with Vertical Heterophoria, ask the patient as following.
6.
“Does the letter (
) locate upside of the letter (
), or downside of it?”
▶
Located upside: “Left Hyperphoria.” Turn the dial clcokwise to increase BU prism, until the
cross is seen well.
▶
Located downside: “Right Hyperphoria.” Turn the dial counterclockwise to increase BD prism,
until the cross is seen well.
[Figure 10-21] Phoria Test without Fixation
