Glaucoma is a group of eye diseases that damage the optic nerve, causing vision loss and blindness. It is usually caused by increased pressure in the eye.

Tests for glaucoma usually include:

• Tonometry (measurement of eye pressure)
• Visual field test (detects peripheral vision loss)
• Optic nerve head evaluation (examines the appearance of the optic nerve)
• Pachymetry (measures corneal thickness)
• Gonioscopy (examines the drainage angle of the eye)

These tests are performed by an eye doctor to diagnose and monitor glaucoma.