This year's symposium and exhibition Optics + Optoelectronics International Society for Optics and Photonics SPIE was the largest in its 10 years of existence, it attracted more than 700 participants from around the world. The extent of the introduced technologies and the number of personalities provided the participants with a superior experience and helped interactions even across fields. This meeting which took place from 13 - 16 April, 2015 was was one of the most important events in optics and photonics in the Czech Republic in the International Year of Light 2015.