32
USING THE INSTRUMENT
6 Follow the similar steps to measure the lens on the opposite side.
Totaled PD will be displayed.
7 Bring the nose rest to the extreme right and fold it. It will stick to the lens table by means of
a magnet.
Range 25 — 45mm on one side (minimum 0.5mm)
8 Difference may occur by the measurement technique and with low-power lenses having a
large camber angle.
If the measured PD value differs from that of marking PD.
No camber angle A camber angle
Since the optical center of the glasses mounted for
the infinite far is searched, the measured PD value
of CL-200 is called the PD/fitting value.
Marking
Principal point
PD fitting
(by PD mechanism)
Marking PD
0∆ flux
When the pupil is on the marking
position in the case of a concave
lens, a prism is added outside.
To Next Page
Loading...
