Insight into the Role of Photoreception and Light Intervention for Sleep and Neuropsychiatric Behaviour in the Elderly

Author(s): Katharina Wulff*, Russell G. Foster

Journal Name: Current Alzheimer Research

Volume 14 , Issue 10 , 2017

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Abstract:

Light exerts influences on many physiological and behavioural functions in humans. These functions can be described as image-forming (IF) and non-image forming (NIF) visual processes, both originating in the retina of the eye. Image-forming refers to vision; the process of detecting and distinguishing shapes and colour of objects. Non-image forming refers to detecting level of light intensity or brightness of ambient space, which affects basal physiology such as cycles of rest and activity or the endocrine system. Rod and cone photoreceptors in the outer retinal layer are most important for imageforming vision, while non-image forming functions depend upon additional input from the photopigment melanopsin, which is expressed in retinal ganglion cells (RGC) that makes these cells photosensitive (pRGC). Projections of these pRGCs convey light-induced electrical impulses to a number of brain regions. Visual acuity and colour contrast naturally diminishes with age but dementia often has major effects on the visual processing systems, which impact on the quality of life. The ability of humans to manipulate their light exposure has the immediate potential to either create problems with human physiology (as in shift workers) or to compensate physiological disadvantages (of IF and NIF visual impairment). This mini-review describes the impact of aging on the function of the eye with respect to nonimage forming effects of light, summarises light intervention studies for sleep and neuropsychiatric symptoms and considers implications from photoreceptor-weighted light intensities for biologically effective light intervention and lighting solutions for patients with dementia.

Keywords: Sleep, circadian, melanopsin, retina, visual impairment, photoreception, Alzheimer, cognitive impairment.

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Article Details

VOLUME: 14
ISSUE: 10
Year: 2017
Page: [1022 - 1029]
Pages: 8
DOI: 10.2174/1567205014666170523095231
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