“To diagnose for glaucoma your MD will do a comprehensive exam that includes measuring intraocular pressure (tonometry), testing for optic nerve damage with a dilated eye examination and imaging tests, checking for areas of vision loss (visual field test), measuring corneal thickness (pachymetry),  & inspecting the drainage angle (gonioscopy).  The damage caused by glaucoma can’t be reversed. But treatment and regular checkups can help slow or prevent vision loss, especially if you catch the disease in its early stages.”.

MAYO CLINIC