Glaucoma is a progressive disease resulting in loss of retinal nerve cells and their axons (retinal nerve fibers). Retinal nerve fibers are ordered in a special manner when they enter the optic nerve. Hence, damage to the retinal nerve fibers by glaucoma results in visual field defects at certain locations. Furthermore, the retinal nerve fiber layers from different receptors for different colors are ordered in a special manner as well. Thus, it is possible that glaucomatous damage causes color vision dysfunction (dyschromatopsia).

At the moment there is disagreement whether dyschromatopsia occurs at early- to mid-stage or only in end-stage glaucoma.

By testing color vision in glaucoma patients the prevalence of dyschromatopsia in glaucoma and in different stages of the disease will be investigated.

Inclusion Criteria:

• diagnosis of open angle glaucoma
• visual acuity >/= 20/50
• age >/= 18 (no upper limit)
• male or female gender

Exclusion Criteria:

• other type of glaucoma
• age <18
• other retinal disease (e.g. age related macular degeneration)
• other disease affecting the optic nerve or the retinal nerve fibers
• known color blindness

Patients with a diagnosis of open-angle glaucoma of the Glaucoma Department at Massachusetts Eye & Ear Infirmary, Boston, MA 02114, US