Appendix; Measurement Values And Descriptions - Weco cad III Operation Manual

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.)
M: Geometrical frame
center
m: Frame PD
b: DBL
CH: Horizontal pre-decentration
of the lens
Z F : Distance decentration point
p R /p L : Monocular PD left/right
u R /u L : Horizontal decentration
from centre of form
right/left
v R /v L : Vertical decentration from
centre of form right/left
x R /x L : Horizontal distance between
the nasal box-line and Z F
36
Abb. 6
y R /y L : Vertical distance between
bottom box line and Z F
Z N : Near decentration point
q R /q L : 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.
h R /h L : Segment height from lower
box line.