Zeiss SL 120, Documentation

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Optional accessories
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Special eyepieces
12.5x eyepieces and a 10x micrometer eyepiece with linear and angular
scales are available.
10x micrometer eyepiece with linear and angular scales
Fig. 21 10x micrometer eyepiece with linear and angular scales
This eyepiece has a linear scale of 15 mm length graduated to 0.2 mm. Use
of this eyepiece requires the 8x position of the magnification changer.
A TABO angle scale graduated to 2° provides determination of the angle of
inclination. It is not necessary to set the magnification changer to a certain
position when using angular measurement.
The angle scale is for measuring the inclination when fitting toric soft
contact lenses.
The contact lenses (fitted and prescription lenses) carry an index mark on
their periphery outside the "optical zone". The contact lens will quickly take
a preferred position by the natural movement of the eye. The index mark on
the lens will no longer coincide with the horizontal line. This deviation, called
inclination, is to be determined.
•
Subtractive inclination:
The index mark, the so-called DS axis (dynamic stabilization axis) lies in
the first quadrant of the TABO scheme, i.e. between 0° and 90°.
•
Additive inclination:
The index mark (DS axis) lies in the second quadrant (between 90° and
180°).