An opthalmological apparatus comprises a base station having a light source for generating light pulses, and an application head which can be mounted on an eye having a light projector for the focussed projection of the light pulses for punctiform breakdown of eye tissue. The system modeler may also be configured to convert business suite solutions. Itaconic acid is produced from citraconic acid. The clutch assembly may be configured to selectively rotationally couple the output shaft to the input shaft via the first pulley, first belt, and second pulley.