Bjerrum's area is the central 25° of the visual field from the fixation point, popularized scientifically by the Danish ophthalmologist Jannik Petersen Bjerrum.
![Graphic detailing the location on the visual field of Jannik Bjerrum's area, as well as several other types of scotomas - including the paracentral scotoma, the central scotoma, seidels scotoma, bjerrums scotoma and the centrocecal scotoma.](http://up.wiki.x.io/wikipedia/commons/thumb/a/a1/Bjerrums_area_and_types_of_scotomas_on_the_visual_field.png/300px-Bjerrums_area_and_types_of_scotomas_on_the_visual_field.png)
Bjerrum believed that this central portion of the visual field was of far more often use than the perimeter of the visual field, since he had observed 90% of the early glaucomatous changes were within these 25°.
Multiple types of scotomas form inside Bjerrum's area, typically in patients with open-angle glaucoma.
Of particular note is the arcuate scotoma (also known as the Bjerrums scotoma). It starts at the blind spot, arching over the macular area, and ends as a horizontal line nasally. The arcuate scotoma does not cross the horizontal divide of the visual field.[1]
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