Ocular Fluorophotometry for Glaucoma Treated With Cyclo-coagulation Using High Intensity Focused Ultrasound (HIFU).

Inclusion Criteria: * refractory primary open-angle glaucoma (POAG) * IOP\> 21 mm Hg and \<32 mm Hg with an optimal treatment. * Lack of history of cyclo-destruction of the ciliary body (laser diode, cold ...) * Lack of intraocular surgery or laser therapy in the eye seen in the three months preceding the date of HIFU treatment. * Male or female age (s) of at least 18 and able to give informed consent * Patient who signed the informed consent form * Patient affiliated to a social security scheme Exclusion Criteria: * History of glaucoma by placing a drainage implant (valves, pipes ...) * previous refractive procedures preventing accurate measurement of intraocular pressure (PRK, LASIK) * General treatment which may alter IOP began in the month before the HIFU procedure * Patient monophthalmus * thyroid orbitopathy * History of ocular or retrobulbar tumor * Cyclodialysis * choroidal hematoma or uprising choroidal * Anatomy of the eyeball inadequate treatment or medical device (eye too small or too large) * Pregnancy, breastfeeding, lack of contraceptive use among women at risk of having a child * Participation in another clinical investigation of a medical or surgical treatment can affect the intraocular pressure in the three months preceding the HIFU * Patient minor or major protected by law