This book has been conceived as a reference for all those who want to
deepen their knowledge of technical details, design concept and interac-
tion of the individual modules of Zeiss operation microscopes. The sub-
jects of the book are classified in accordance with our intention.
Special emphasis has been placed on practical hints for the user of
opera- tion microscopes to avoid operating errors. Parameters which are
of para- mount importance for surgeon and assistant such as PD and
diopter set- ting are therefore described in detail. The effects of
wrong adjustments are indicated. The above statements also apply to the
ample selection of acces- sories for Zeiss operation microscopes. That
is why much attention has been given to the accessories for
co-observation and documentation. The most frequently used formulae are
liste in the last chapter of the book, supplemented by nomograms which
allow the reader to determine the most important data of a specific
piece of microscope equipment without calculation. Our thanks are due to
all those who assisted in preparing the manuscript, drawings and
photographs, to Mrs. Ursula Gabler for making the English translation
and Miss Helen Robertson for editing it, and last but not least to the
Springer-Verlag for the most careful, qualified and excellent pro-
duction of the book.