93
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
[Figure 10-19] Schober Test
Chart Shape
Heterophoria Type
Correction of Heterophoria
Esophoria
Turn the dial clockwise (- direction) to
increase the value of BO prism, until
the cross locates in the middle of the
circle.
Exophoria
Turn the dial counterclockwise (+
direction) to increase the value of BI
prism, until the cross locates in the
middle of the circle.
Left Hyperphoria
Press Vertical Prism button and turn
the dial clockwise (- direction) until
the cross locates in the middle of the
circle.
Right Hyperphoria
Press Vertical Prism button and turn
the dial counterclockwise (+ direction)
until the cross locates in the middle of
the circle.
[Table 10-2] Interpretation of Schober Test Result
