What does a person with Glaucoma see?

Early on, a person with glaucoma often sees completely normally, which is exactly what makes it dangerous. Damage usually begins in the peripheral, side vision and progresses so slowly that the brain fills in the gaps, so by the time someone notices missing areas, a large amount of optic-nerve function may already be lost, and it cannot be recovered. This is why visual field testing and OCT imaging matter: they reveal damage you cannot feel or see in daily life, allowing earlier treatment.