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About Neurobiology!

Human Anatomy, Physiology, and Medicine. Anything human!

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About Neurobiology!

Postby goose_keeper » Mon Aug 22, 2005 4:37 am

I have a question when facing the computer screen:

When I watch the screen every morning after a good sleep, I find that my eyes can't adjust to it. I don't think there is anything wrong with my eyes.
But why I has a trouble in watching the screen? Does it mean that there is a shortage of vitamin in my body?

I know from the neurobiology textbook that there are two types of cells on the retina which are in charge of the sight at day and night separately!

So how can I adjust my habit of food and sleep to get a well sight condition? And what happened to my eyes?

Thanks for your attention!
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Postby victor » Mon Aug 22, 2005 8:04 am

Yup, you're right...retina has 2 types of cell which are cone-shaped cell and cylinder-like-shaped cell. The cone-shaped cell is used to differ the colors and they're active during day (or many light) meanwhile cylinder-like-shaped cell is used only to differ between white and black and they're active when our sight is poor of light.
These 2 cells work as antagonis cell. In your case, when you close your eyes (or in dark area), the cylinder cell is active in forming dark pigment and when you wake up and staring at the screen, the dark pigment is suddenly dissolve and cone cell is active forming 'bright' pigment to adjust your sight..
Actually this case is the normal one and it needs time for these 2 cells to exchange each other, so don't worry..but I sugget for you not suddenly watch your monitor when you wake up.
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Postby MrMistery » Mon Aug 22, 2005 6:53 pm

Actually this info should not be retained as Victor presented it. The retina contains 6 types of cells: Cones, rodes, amacrines, horizontal, bipolar and multipolar. Cones and rods(as Victor calls them, cilinders) are the receptor cells.
The mechanism presented is correct. The time the eye needs to adapt to light from darkness is about 5-6 minutes. Also, victor is right. Watching the monitor immediately after you wake up is a bad idea, as the cells may suffer lesions...
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Postby victor » Thu Sep 08, 2005 12:11 pm

Bwahaha..many rights..thank you.. :lol:
Oh, by the way,can you explain about the amacrine, horizontal, bipolar and multipolar? Honestly, I've just heard it now...
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