Glaucoma is not simply an increase of ocular pressure, but the loss of optical nerve function as a result of heightened intraocular pressure (IOP). Therefore, every case of ocular hypertension is not necessarily glaucoma, but every glaucoma is considered a progressed case of IOP. Glaucoma is only an official diagnosis when heightened inner-eye pressure has caused damage to the optic nerve and doctors see this through digital imaging. 

What is the cause of glaucoma?

What does glaucoma look like?