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Nov 28, 2023 · The RPE is an important component of the BRB that regulates the movement of nutrients, ions, and fluid between the choroid and neural retina. Moreover, the RPE can absorb light and protect retinal cells from oxidation, thereby preventing retinal oxidative damage.
Oct 31, 2023 · In vertebrates, the main photopigment, rhodopsin, has two main parts: an opsin, which is a membrane protein (in the form of a cluster of α-helices that span the membrane); and retinal, a molecule that absorbs light.
Light absorption: RPE are responsible for absorbing scattered light. This role is very important for two main reasons, first, to improve the quality of the optical system, second, light is radiation, and it is concentrated by a lens onto the cells of the macula, resulting in a strong concentration of photo-oxidative energy.
Jan 26, 2011 · It is believed that a reduced capability to absorb light and to compensate for oxidative damage are important factors initiating the chain of events leading to the onset of age-related macular degeneration in the older population (see Age-Related Macular Degeneration, Webvision).
- Olaf Strauss
- 2011/01/26
- 2011
Jul 1, 2005 · The exposure of the adult retina to ultraviolet light is rather low because the lens absorbs most of the ultraviolet light. However, melanosomes and blue light absorbing pigments are only responsible for the absorption of ∼60% of light energy ( 84 , 85 ).
- Olaf Strauss
- 2005
Jan 1, 2018 · When a visual pigment molecule absorbs light, a chain of enzymatic reaction is triggered leading to an electrical signal, which starts the visual process, and the visual pigment molecule dissociate into its components; however, the chromophore 11-cis retinal is transformed into all-trans retinol.
The chromophore absorbs photons of light, using a mechanism that involves a change in its configuration. In vertebrate rods the chromophore is retinal, the aldehyde of vitamin A 1. When retinal absorbs a photon, the double bond between the 11th and 12th carbon atoms flips, thus reconfiguring the molecule from the 11-cis to the all-trans form.
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