luxvision PM 200, Руководство пользователя

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5. Forehead bearer
The testee’s forehead reasts on the forehead bearer so that the position of
his pupils is fixed.
2.3 Viewed from the Measuring Window (as shown in Fig.4)
Pupillary Distance Pointer
The widths in the observation windows of the device are 0.45mm vertical black
lines, one in the left window and the other in the right window. Pressing measuring
keys of the left and right pupils will make the pointer move on the reflecting light
dot of the human pupil, thus permitting measurement of the pupillary distance.
Important Matters
When the single-face pupillary distance pointer reaches the maximum or minimum
range of measurement (maximum value 41.5mm as shown in Fig.5 a or 22mm
as shown in Fig.5b) after pressing left or right pupillary distance measuring key
to move the pupillary distance pointer, the area of measuring window outside the
range of measurement becomes black. At this time, the pupillary distance pointer
is invisible in the measuring window and can be observed only after adjusting the
left or right measuring key of pupillar distance in reverse.
Pupillary distance pointer
Observation window
Fig. 4
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