Glaucoma is a series of eye illnesses in which the optic nerve is injured and the visual field is permanently lost. Increased intraocular pressure causes optic nerve injury, however it can also happen with a normal IOP. Glaucoma involves increased pressure in the eye, which causes visual field deterioration and eventually vision loss. Make an appointment with your ophthalmologist. If you have a family history of glaucoma or see any indications of glaucoma, you should consult a doctor to identify the best treatment choice for you.