Successive Enlargements of a Fly's Eye (IMAGE) Université de Genève Caption he eye is made up of many facets, which are themselves covered by a thin layer of protuberances a few tens of nanometres high. 1 micrometer (mm) = 1000 nanometers (nm) Credit © UNIGE Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.