RB-473-B02M
30
7.3. Marking of prism Lens
Prescription expressed in X-Y
(1) Select "X-Y" from "Prism" in the Menu screen.
(2) Move the lens so that the prism values displayed on
the screen accord with those of the prescription.
Indicated values for prism are as follows.
Px I Base In
Px O Base Out
Py U Base Up
Py D Base Down
Prescription expressed in P-B
(1) Select "P-B" from "Prism" in the Menu screen.
(2) Move the lens so that the prism values displayed on
the screen accord with those of the prescription.
P: Prism value
B: Base direction
Prescription expressed in mm
(1) Select "On" from "Prism(mm)" in the Menu screen.
(2) Move the lens so that the prism values displayed on
the screen accord with those of the prescription.
Arrows ( ) indicates the direction you
should move the lens to make its optical center
reached the measurement center.
S
C
A
Px
Py
0.00
1.50
±
25
.
S
S
S
C
A
P
B
0
±
25
S
Cyl
Abbe
Step
S
S
C
A
P
B
+2.00
+1.00
0
1.50
90
±
25
.
S
Cyl
Abbe
0.0
Step
S
Prism in mm
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