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8 Appendix
8.1 Measurement values and descriptions
The WECO CAD 2000 use values and descriptions according to DIN 58 208
i.e DIN 58 200. To ensure universal operation the values for b', CH, y' and h' have been addded
(all measurements in mm.)
Abb. 6
M:
Geometrical frame
center
m:
Frame PD
b:
DBL
CH:
Horizontal pre-decentration
of the lens
ZF:
Distance decentration point
pR/pL: Monocular PD left/right
uR/uL: Horizontal decentration
from centre of form
right/left
vR/vL: Vertical decentration from
centre of form right/left
xR/xL: Horizontal distance between
the nasal box-line and ZF
yR/yL: Vertical distance between
bottom box line and ZF
ZN:
Near decentration point
qR/qL: near monocular PD
right/left
b':
Segment width
e:
Horizontal segment
displacement by multi-
focals (Inset)
t:Vertical displacement
between segment top and
distance centre.
hR/hL: Segment height from lower
box line.
