36
USING THE INSTRUMENT
MARKING A LENS WITH PRISM POWER
• When the prescription is displayed with X-Y (orthogonal
coordinates) ( )
Tap the prism button and get display.
Carry out aligning according to the prism value as
prescribed and as displayed on the screen.
I in prism value: Base In
O in prism value: Base Out
U in prism value: Base Up
D in prism value: Base Down
• When the prescription is displayed with P-B (polar coordi-
nates) ( )
Tap the prism button and get display.
Carry out aligning according to the prism value as
prescribed and as displayed on the screen.
P: Prism value
B: Base orientation
• When the unit is mm ( )
Tap the prism button and get display.
The marks show the optical center
reaches the center of measurement by moving the
lens in the arrow directions by the distance as dis-
played.
: 3.0mm
: 2.0mm The position is shown in the right figure.
Take care that the polar coordinates are not the
same as the value on the angular scale in the
target image.
• 0 will be displayed if the spherical power S is around 0.
• When the prism value is more than 10 (vertical direction), the measurement
value is recognized as a reference value. For reference value, * (asterisk) is dis-
played at the measurement result. Measurement values recognized as refer-
ence value: SCA value, prism value, ADD value
INITIAL/PRISM/X-Y
INITIAL/PRISM/P-B
INITIAL/PRISM/mm
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