Zeiss VISULAS YAG III, User Manual

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Operation of the device
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The laser is intended for use with the focus in these three positions only.
1
Focus shift control
2 Magnification changer
Fig. 49 Focus shift control

Always turn the focus shift control until it clicks into position (an
audible click should be heard).
The focus shift of the VISULAS YAG III is designed for pulse energies of up to
about 1.5 mJ.
•
If you wish to work with higher energy levels (e.g. for fibrotic secondary
cataracts), you must increase the focus shift distance by defocusing:
–
In switch position ant., you must defocus in the anterior direction.
–
In switch position post., you must defocus in the posterior direction.

The degree of defocusing required depends on factors such as the
application and the specific conditions of the eye to be treated. It is
therefore not possible to give a general recommendation.