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The response of the neuronal adaptive system to background illumination and readaptation to dark in the immature retina
Umeå University, Faculty of Medicine, Department of Clinical Sciences, Ophthalmology. Department of Ophthalmology, Ruijin Hospital, Medicine School of Shanghai, Jiaotong University, Shanghai, China.
Umeå University, Faculty of Medicine, Department of Radiation Sciences.
Umeå University, Faculty of Medicine, Department of Clinical Sciences, Ophthalmology.
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2015 (English)In: Acta Ophthalmologica, ISSN 1755-375X, E-ISSN 1755-3768, Vol. 93, no 2, 146-153 p.Article in journal (Refereed) Published
Abstract [en]

Purpose: Developmental characteristics of the neuronal adaptive system of the retina, focusing on background light (BGL) adaptation and readaptation functions, were studied by measuring the oscillatory response (SOP) of the electroretinogram (ERG).

Methods: Digitally filtered and conventional ERGs were simultaneously recorded. Rats aged 15 and 17 days were studied during exposure to BGLs of two mesopic intensities and during readaptation to dark.

Results: Results were compared to adult rats. In ‘low mesopic’ BGL SOP instantly dropped significantly to about half of its dark-adapted (DA) value contrary to mature rats, in which the SOP significantly increased. In ‘high mesopic’ BGL SOP decreased to about 20% and 30% of DA values in immature and adult rats, respectively. The process of recovery of SOP in darkness lacked the transient enhancement immediately as BGL was turned off, characteristic of adult rats. There were no major age differences in adaptive behaviour of a-wave. In young rats, recovery of b-wave was relatively slower.

Conclusions: Properties of BGL adaptation and readaptation functions of the neuronal adaptive system in baby retina differed compared to the adult one by being less forceful and more restrained. Handling of mesopic illumination and recovery in the dark was immature. Development of these functions of the neuronal adaptive system progresses postnatally and lags behind that of the photoreceptor response and seems to be delayed also compared to that of the bipolar response.

Place, publisher, year, edition, pages
2015. Vol. 93, no 2, 146-153 p.
Keyword [en]
background light adaptation, electroretinogram, immature neuronal adaptive system, oscillatory tentials, readaptation to dark
National Category
Ophthalmology
Identifiers
URN: urn:nbn:se:umu:diva-101387DOI: 10.1111/aos.12456ISI: 000349900200032PubMedID: 24924739OAI: oai:DiVA.org:umu-101387DiVA: diva2:840217
Available from: 2015-07-07 Created: 2015-03-30 Last updated: 2017-12-04Bibliographically approved

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