High Quality Content by WIKIPEDIA articles! The Optical Gravitational Lensing Experiment or OGLE is a Polish astronomical project based at the University of Warsaw that is chiefly concerned with discovering dark matter using the microlensing technique. Since the project began in 1992, it has discovered several extrasolar planets as a side benefit. The project is led by Professor Andrzej Udalski, who is a co-author of the discovery of OGLE-2005-BLG-390Lb.