Multifocal technique: Difference between revisions

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'''Multifocal techniques''' are used in [[electroretinography|electroretinogram]] and [[visual evoked potential]] recordings to separate the responses originating from the stimulation of different locations in the [[visual field]] (and thus different [[retina|retinal]]l locations).

The concept is as follows: Each visual field ___location is stimulated with a [[stimulus (physiology)|stimulus]] [[sequence]] that is [[correlation|uncorrelated]] to the sequences used for the other locations. All visual field locations are stimulated in parallel with their individual stimulus sequence. The retinal or [[Visual cortex|cortical]] activity, which is a mixture of the responses from all visual field locations, is recorded with usual [[electroretinography|electroretinographic]] or [[visual evoked potential]] methods, respectively. Due to the independence of the stimulus sequences, the responses for each visual field ___location can be extracted using mathematical algorithms.

Mutifocal techniques, in particular the multifocal ERG, are used in the [[diagnosis]] of [[ophthalmology|ophthalmological]] diseases. The multifocal technique was developed in the early 1990s in the laboratory of Erich Sutter at the [[Smith-Kettlewell Eye Research Institute]]<ref>{{Cite journal|last=Hood|first=Donald C|date=September 2000|title=Assessing retinal function with the multifocal technique|url=https://linkinghub.elsevier.com/retrieve/pii/S1350946200000136|journal=Progress in Retinal and Eye Research|language=en|volume=19|issue=5|pages=607–646|doi=10.1016/S1350-9462(00)00013-6|pmid=10925245|s2cid=35169382 |doi-access=free}}</ref><ref>{{Cite journal|last1=Baseler|first1=H.A.|last2=Sutter|first2=E.E.|last3=Klein|first3=S.A.|last4=Carney|first4=T.|date=January 1994|title=The topography of visual evoked response properties across the visual field|url=https://linkinghub.elsevier.com/retrieve/pii/0013469494901147|journal=Electroencephalography and Clinical Neurophysiology|language=en|volume=90|issue=1|pages=65–81|doi=10.1016/0013-4694(94)90114-7|pmid=7509275|url-access=subscription}}</ref><ref>{{Cite journal|last1=Sutter|first1=Erich E.|last2=Tran|first2=Duong|date=March 1992|title=The field topography of ERG components in man—I. The photopic luminance response|url=https://linkinghub.elsevier.com/retrieve/pii/004269899290235B|journal=Vision Research|language=en|volume=32|issue=3|pages=433–446|doi=10.1016/0042-6989(92)90235-B|pmid=1604830|s2cid=2214210 |url-access=subscription}}</ref>

Mutifocal techniques, in particular the multifocal ERG, are used in the [[diagnosis]] of [[ophthalmology|ophthalmological]] diseases.

==References==

[[Category:Medical tests]]

{{Reflist}}

[[Category:Ophthalmology]]

[[Category:Diagnostic ophthalmology]]