[Unexplained loss of visual acuity in a 22-year-old woman].

Developmental disorders of the fovea are almost always accompanied by loss of visual acuity (VA) and are usually associated with different syndromes. We report on a young female patient with an unclear loss in VA, inconspicuous medical history and normal results for funduscopy, electrophysiology and clinical examinations. The presence of fovea plana could be confirmed by spectral-domain optical coherence tomography (OCT).