Dictionary » R » Retinal



1. (Science: anatomy) Pertaining to the retina.

2. (Science: biochemistry) The aldehyde of retinol, derived by the oxidative enzymatic splitting of absorbed dietary carotene and having vitamin A activity. In the retina, retinal combines with opsins to form visual pigments. One isomer, 11 cis retinal combines with opsin in the rods (scotopsin) to form rhodopsin or visual purple. Another, all trans retinal (trans r.), visual yellow, xanthopsin) results from the bleaching of rhodopsin by light, in which the 11 cis form is converted to the all trans form. Retinal also combines with opsins in the cones (photopsins) to form the three pigments responsible for colour vision.

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... AGAINST your explanation? If your brain is making inferences about what's in your blindspot, that suggests it ISN'T reconstructing the actual retinal image.

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by TheSunshineEmperor
Thu May 24, 2012 6:46 pm
Forum: Evolution
Topic: Evolutionary advantage of seeing 'upright'
Replies: 17
Views: 12187

Confusion: Rod cells,rhodopsin bleaching

... to function. I understand that exposure to bright light bleaches all of the rhodopsin, but...so what? Why doesn't the bleached product (opsonin/retinal) simply get re-synthesised back into rhodopsin as it does in dim light, and therefore continue the cycle and enable impulses?

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by ADAS137
Sun Jan 01, 2012 10:26 pm
Forum: Human Biology
Topic: Confusion: Rod cells,rhodopsin bleaching
Replies: 0
Views: 1218

Re: UNILATERAL red-green color blindness

Unilateral colour vision defects are most commonly associated with retinal pathology or compressive lesions involving the optic nerve/optic tract/occipital lobe of the brain. If the unilateral colour vision defect was detected using Ishihara plates only (ie ...

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by Curio
Wed Mar 03, 2010 2:37 pm
Forum: Genetics
Topic: UNILATERAL red-green color blindness
Replies: 7
Views: 14446

eye are window to your health?

Visualization using an opthalmoscope allows you to see the structures in the ocular fundus - optic disc, retinal vessels, general background and macula. Abnormalities in these areas can give you insight into different disease states. (I'm not sure if you want details about ...

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by bionewbie
Thu Feb 11, 2010 12:32 am
Forum: Human Biology
Topic: eye are window to your health?
Replies: 4
Views: 4812

Light-dependent Reaction Questions

... human physiology, you will know that the cones in the eye have three different proteins for red, blue and red, but all three are bound to the same retinal molecule. because the retinal is in a different environemnt(surrounded by different proteins) it can absorb different wavelengths of light. ...

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by MrMistery
Sat Dec 06, 2008 3:18 pm
Forum: Botany Discussion
Topic: Light-dependent Reaction Questions
Replies: 3
Views: 7313
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