In 1996, the Swiss security printer Orell Füssli and IAI cooperated in the development of a new security feature using laser perforation for the protection of banknotes. This so called MicroPerf security feature is a perforation representing e.g. the domination's value.
MicroPerf is highly counterfeit-proof due to the very small holes applied by the MicroPerf lasersystem. It is virtually impossible to reproduce these types of holes with mechanical means. The micro-perforated pattern is not visible when looking down on a note, but is clearly visible when the note is held up against the light.
The MicroPerf feature has been introduced in Swiss, Lithuanian and Russian banknotes.