Glaucoma is an eye condition if left untreated, can lead to irreversible blindness. It has a genetic presposition, thus early detection through screening is important. Glaucoma is not a single disease entity, but refers to a group of eye conditions which share certain common features. Most eye surgeons agree that to make a diagnosis of glaucoma, the following features should be present:  

1. Higher than normal eye pressure

2. Evidence of damage to the optic nerve; change in appearance of the optic nerve which shows damage.

3. Damage to the visual field of the eye whic​h can be demonstrated by performing certain tests on the patient.