The purpose of the study is to prove if there is any difference in the nerve fiber layer between patients with normal- and high-tension-glaucoma with similar structural optic nerve head parameters.

It is till now not definitely clear whether normal- and high-tension glaucoma are different forms of the same disease and whether they have similar pathogenetic mechanisms. Spectral domain optical coherence tomography (SD-OCT) is supposed to objectively evaluate retinal nerve fiber layer (RNFL) thickness. The investigators propose a study to compare the RNFL in patients with normal- and high-tension-glaucoma. In order to exclude other possible differences,which could influence the results, only patients with similar structural optic nerve head damage in both groups will be compared.

Inclusion Criteria:

• persons over 18 years
• men or women
• with normal- and high-tension glaucoma

Exclusion Criteria:

• cataract
• cloudy cornea and other conditions with bad visualisation quality of optic nerve head
• optic nerve atrophy except glaucomatous

primary care clinic University hospital of Dresden