Essilor ALM 700 User Manual

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7.3 Marking of Prism Lens
 In case that prescription is expressed in X-Y
(1) Select “X-Y” from “Prism” on the “Setup” screen.
(2) Move the lens so that the prism values displayed on
the screen match with the ones on the prescription.
The meanings of the prism values displayed are as
shown below.
Px I Base In (base inward)
Px O Base Out (base outward)
Py U Base Up (base upward)
Py D Base Down (base downward)
 In case that prescription is expressed in P-B
(1) Select “P-B” from “Prism” on the “Setup” screen.
(2) Move the lens so that the prism values displayed
on the screen match with the ones in the
prescription.
P: Prism value
B: Base direction
 In case that prescription is expressed in mm
(1) Set “Prism (mm)” as “On” on the “Setup” screen.
(2) Move the lens so that the prism values displayed
on the screen match with the ones in the
prescription.
The arrows ( ) indicate the direction of
the measuring position on the lens from its
optical center.
Measurement position
Optical center

Essilor ALM 700 Specifications

General

Brand	Essilor
Model	ALM 700
Category	Measuring Instruments
Language	English