The glaucoma examination is conducted as part of the standard eye examination performed by an ophthalmologist or an optometrist. In glaucoma tests, intraocular pressure measurements should be checked, and the optic nerve should be examined for any abnormalities. If there is any suspicion of optic nerve damage, a visual field test should be conducted. Among the studies that provide the most information about the structural changes of the optic nerve is the optical disc tomography performed with a laser, called HRT (Heidelberg Retinal Tomograph), of which there are several versions depending on the software used and the resolution of the test. This can systematize findings such as ring border, hemorrhages, and depth of optic nerve lesion, as well as the thickness of the functional and supportive nerve fiber layer. It is also important to measure the thickness of the cornea with PACHYMETRY, to correct errors in ocular pressure measurement caused by resistance differences between thin and thick corneas.