PERG

Perg is a toponym used in Austria to designate both a district and its capital town. Perg district (Bezirk Perg) is one of the districts of the state of Upper Austria. The town of Perg serves as the district's administrative center, and the district contains multiple municipalities. The area is part of the cultural and historical region of Upper Austria and is characterized by rural landscapes and small towns.

PERG also refers to pattern electroretinography, a non-invasive diagnostic test in ophthalmology. Pattern electroretinography records the retina’s electrical responses to alternating visual patterns, such as black-and-white checks, to assess retinal function. The test primarily evaluates the function of retinal ganglion cells and, to some extent, the macula. It is used to help diagnose and monitor diseases such as glaucoma, optic neuropathies, and certain macular disorders, and can be performed under various lighting conditions with different stimulus patterns. The procedure requires the patient to fixate and uses surface or corneal electrodes; results are interpreted against age-appropriate norms.

In practice, Perg as a term most often appears in two contexts: a geographic designation in Austria and as the acronym PERG for the ophthalmologic test. In other uses, the meaning should be inferred from context, and disambiguation may be necessary.