- Jannik Peterson Bjerrum
Jannik Peterson Bjerrum (
December 26 ,1851 - 1920) was a Danishophthalmologist who was a native of Skarbak, a town in the southernmost part ofJutland . In 1864 Skarbak became part of Germany due to consequences of theSecond Schleswig War .In 1876 he received his medical doctorate from the
University of Copenhagen , and in 1879 became an assistant toEdmund Hansen Grut (1831-1907) at the Havnegade eye clinic. After Grut's retirement in 1896, he became director of the clinic, as well as being the second professor ofophthalmology at the University of Copenhagen, a position he would maintain until his retirement in 1910.Bjerrum made contributions regarding pathogenetic research of
glaucoma , and performed extensive investigations involving campimetry. He was interested in the correlation between visual perception of form and the resolving power in localized regions of theretina . He was particularly focused on the subtleties of the central 30° of thevisual field rather than the standardperimetry tests that many of his contemporaries favored.As a result of his campimetric tests he discovered a small glaucomatous
scotoma that was to become known as a "Bjerrum scotoma", which is a visual field defect that goes by several other names, such as "sickle scotoma", "arcuate scotoma" or "scimitar scotoma". Other eponyms named after Bjerrum include:
* "Bjerrum tangent screen": Screen used to assess the central 30° of the visual field.
* "Bjerrum's area": An arcuate region that extends above and below the blind spot to between 10° and 20° of fixation point.After Bjerrum's retirement in 1910, his work in campimetry was continued by his assistant,Henning Rønne (1878-1947).References
* [http://www.mrcophth.com/ophthalmologyhalloffame/bjerrum.html Ophthalmology Hall of Fame, Biography]
* [http://webeye.ophth.uiowa.edu/ips/PerimetryHistory/4-tangentscreen.htm Imaging and the Perimetry Society, The age of isopter perimetry: Bjerrum and the tangent screen]
* cite book
title=Opthalmology
author=
year=
publisher=
isbn=8122414710
url=http://books.google.com/books?id=tRzi3sYBInIC&pg=PA226&lpg=PA226&dq=%22Bjerrum's+area%22&source=web&ots=xsyq717QZG&sig=k8vqU5D8ESxUxcPbxq3FH8dAy9E&hl=en&sa=X&oi=book_result&resnum=10&ct=result
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