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Background light adaptation of the retinal neuronal adaptive system. I. Effect of background light intensity.
Umeå University, Faculty of Medicine, Department of Radiation Sciences.
2001 (English)In: Documenta Ophthalmologica, ISSN 0012-4486, E-ISSN 1573-2622, Vol. 103, no 1, 13-26 p.Article in journal (Refereed) Published
Abstract [en]

The behaviour of the neuronal adaptive retinal mechanisms to environmental light exposures was studied by measuring the oscillatory potentials (OPs) of the electroretinogram. Dark adapted rats were exposed to four levels of background light (BG), starting at a 'low scotopic' level of 1.43x 10(6) cd/m2, increased by steps of two log units, through 'high scotopic' -, 'low mesopic' - and finally the 'high mesopic' BG of 1.43x 10(0) cd/m2. The summed oscillatory response significantly increased as the BG intensity was raised, except at the 'high mesopic' level. The amplitudes of the a- and b-waves reduced as the BG light increased above the 'high scotopic' level. Each OP responded individually to the different BGs. O1 and O2, significantly enhanced at the 'low scotopic' BG. The amplitudes of the three later OPs increased significantly at the 'low mesopic' BG. The adaptational behaviour of the retinal oscillatory response to BG illumination was different to that of the a- and b- waves. The results indicate that the adaptational neuronal system, as reflected by the OPs, seems to be relatively robust and is separate from the slower photochemical adaptive process in the distal retina. The tentative corollary suggests the oscillatory system to play a vision-preserving role, possibly as an alert against undue depletion of the slowly regenerating visual pigment. The enhancement of the oscillatory response at the 'mesopic' illumination levels indicate both scotopic and photopic processes to contribute to neuronal adaptive activity of the retina.

Place, publisher, year, edition, pages
2001. Vol. 103, no 1, 13-26 p.
National Category
Ophthalmology
Identifiers
URN: urn:nbn:se:umu:diva-135125PubMedID: 11678157OAI: oai:DiVA.org:umu-135125DiVA: diva2:1096763
Available from: 2017-05-19 Created: 2017-05-19 Last updated: 2017-05-19

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CiteExportLink to record
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Citation style
  • apa
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