Since May 2014, the hospital group Paris Saint Joseph led the pilot study LIPIDOXA whose challenge is to quantify / measure NAION and explained by a biochemical approach, specifically Lipidomics. The CANALOXA study is the logical continuation of LIPIDOXA study insofar design methodology relies heavily on techniques developed for LIPIDOXA study and that the expected results will be complementary to those of LIPIDOXA.