LessStress - Perfektion für Bohrbrillen
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Drill features (front view)
Drill features (rear view)
Basic equipment (European)

Working with LessStress
General hints
Measuring the demo lens:
   Step 1
   Step 2
   Step 3
Change to prescription lenses

Other features
Notching and slotting
Changes in shape and size
Changing the pantoscopic tilt
Prescription lenses with different thicknesses
Various speeds
Working with blocked lenses


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General hints

Every drilled job with LessStress follows the same protocol: the two coordinates of a hole refer to a reference point of the Y-axis at 0.00 and the edge of the lens. You will measure holes and notches starting from this point.

You can find a detailed manual with further instructions at Downloads.


The angle in which the lenses should be drilled are determined by the frame chassis/mounting. If you drill plus or minus lenses - the adjustment of the mounting will be a lot easier if you do not drill vertically but use the angles given by the frame chassis/mounting. If you are not sure about the angle, using an angle of 8° will be close to the optimal angle (drawing 1 and 2).

Bohren konkav

Drill konkav

Bohren konvex

drill konvex

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