Huvitz HPE-810, User Manual, Page: 28 / 155

28
28
HPE-810 HUVITZ
The edger shows movement amount of the optical center for blocking on the screen. Active blocking
is much easier than Passive blocking for blocking. However, active blocking has some limitations,
which may result in unexpected outputs. The following table compares active blocking and passive
blocking and summarizes the advantages and disadvantages of them. As it says, if the optical
center is far from the frame center, active blocking could make a little bit poor qualified output. So,
in this case, passive blocking is recommended.
<Comparison with active blocking and passive blocking>
Active Blocking Passive Blocking
Blocking Optical Center of Lens Geometrical Center of Frame
User
Convenie
nce
Just following the Marking Spot of Lensmeter
Have to move the Lens
according to GUI
Minimum
Edging
Size
There can be additional limitations because of PD,
OH(Optical Height)
No additional limitation
Lens
Adaptor
Lens
Edging
Quality of
Beveling
or
Grooving
Eccentric Edging Centric Edging
NOTE
Boxing center is recommended with following situations.

PD(=Pupil Distance) is in eccentric position
 Horizontally wide frame
 Super hydrophobic lens or ultra hi-index lens
Lens
Adaptor
Wheel
Lens