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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]]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 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>
==References==
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