Symptoms

Subtle loss of contrast

Difficulty driving at night

Loss of peripheral vision (late-stage glaucoma)

Loss of central vision in terminal cases

Early on, glaucoma causes a subtle loss of contrast between objects and their backgrounds  for example, not being able to distinguish the curb from the sidewalk or missing a step in a staircase. Many people are uncomfortable or afraid to drive at night because of contrast loss. When glaucoma progresses, the resultant optic nerve damage causes an irreversible loss of peripheral vision.