To assess the improvement in reproducibility of 100 vs. 16 averaged images by Automatic Real Time (ART) using Spectralis™ Spectral Domain-Optical Coherence Tomography (SD-OCT, Heidelberg Engineering GmbH, Heidelberg, Germany) in retinal nerve fiber layer thickness (RNFL) circle scan-measurements.

• Trial with medical device

Inclusion criteria:

for both groups (glaucoma study group and control group): men and women of at least 50 years of age

for the glaucoma study group: diagnosis of primary open angle glaucoma (POAG)

Exclusion criteria:

for both groups (glaucoma study group and control group):

• less then 18 years of age
• any pathology of the central retina
• any optic nerve disorder other then glaucoma
• retinal vascular disorder

for the glaucoma study group: other glaucoma diagnosis then primary open angle glaucoma

for the control group: any diagnosis of glaucoma

patients and controls are selected out of our primary care clinic