Patient: 58 years of age, male, BCVA 0.8 at OD, 0.7 at OS, IOP 16/14 mmHg. Ocular Medical History: therapy with topical carbonic anhydrase inhibitors and prostaglandin analogs. General Medical History: arterial hypertension. Main Complaint: visual field defects at OS. Purpose: to present glaucomatous optic nerve degeneration in a patient with small optic discs. Methods: Colour Photography Posterior Segment, OCT-Spectralis, Visual Field, HRT. Findings: Colour Photography Posterior Segment: small optic discs with parapapillary atrophy, no visible cupping. OCT: thinned retinal nerve fiber layer with 43 µm at OD, 49 µm at OS. Visual Field: visual field defects (OS>OD) with MD 5.0dB at OD, MD 6.5dB at OS. HRT: small disc areas with 1.2 mm² at OD, 1.4mm² at OS, regular HRT-parameters. Discussion: Disc areas lower or equal 1.5 mm2 were defined as small discs. The detection of glaucoma focusses on the evaluation of morphometric changes in the optic nerve. Such abnormalities include changes in the optic disc area, cup area, and neuroretinal rim volume and retinal nerve fiber layer thickness. Assessment of the optic disc size is an essential component. Eyes with smaller discs might induce higher risks for developing and processing glaucomatous damage due to fewer optic nerve fibers and a smaller anatomic reserve capacity. Optic nerve fiber count correlates with optic disc area. (1) Literature (1) Jonas JB, Schmidt AM, Müller-Bergh JA, Schlötzer-Schrehardt UM, Naumann GO. Human optic nerve fiber count and optic disc size. Invest Ophthalmol Vis Sci. 1992 May;33(6):2012-8.