Optophysiological characterisation of inner retina responses with high-resolution optical coherence tomography

Erchova, Irina, Tumlinson, Alexandre R., Fergusson, James, White, Nicholas, Drexler, Wolfgang, Sengpiel, Frank ORCID: https://orcid.org/0000-0002-7060-1851 and Morgan, James ORCID: https://orcid.org/0000-0002-8920-1065 2018. Optophysiological characterisation of inner retina responses with high-resolution optical coherence tomography. Scientific Reports 8 , 1813. 10.1038/s41598-018-19975-x

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Abstract

Low coherence laser interferometry has revolutionised quantitative biomedical imaging of optically transparent structures at cellular resolutions. We report the first optical recording of neuronal excitation at cellular resolution in the inner retina by quantifying optically recorded stimulus-evoked responses from the retinal ganglion cell layer and comparing them with an electrophysiological standard. We imaged anaesthetised paralysed tree shrews, gated image acquisition, and used numerical filters to eliminate noise arising from retinal movements during respiratory and cardiac cycles. We observed increases in contrast variability in the retinal ganglion cell layer and nerve fibre layer with flash stimuli and gratings. Regions of interest were subdivided into three-dimensional patches (up to 5-15μm in diameter) based on response similarity. We hypothesise that these patches correspond to individual cells, or segments of blood vessels within the inner retina. We observed a close correlation between the patch optical responses and mean electrical activity of afferent visual neurons. While our data suggest that optical imaging of retinal activity is possible with high resolution OCT, the technical challenges are not trivial.

Item Type:	Article
Date Type:	Published Online
Status:	Published
Schools:	Biosciences Optometry and Vision Sciences
Publisher:	Nature Publishing Group
ISSN:	2045-2322
Date of First Compliant Deposit:	10 January 2018
Date of Acceptance:	3 January 2018
Last Modified:	10 May 2023 18:59
URI:	https://orca.cardiff.ac.uk/id/eprint/108074

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