Also, if we close our eyes and our eye is resting and we're "seeing dark" doesn't that mean if we open our eyes in a dark room our eyes are still resting? So how come we still have to close our eyes in a dark room for it to rest 😲

(December 7, 2017 at 3:49 am)pool the matey Wrote: Also, if we close our eyes and our eye is resting and we're "seeing dark" doesn't that mean if we open our eyes in a dark room our eyes are still resting? So how come we still have to close our eyes in a dark room for it to rest 😲

My idea is that they dry out more if they remain open, and have to work to blink regularly. Just keeping them closed keeps them nicely moisturized without having to blink all the time...

Your eyes are not resting in the sense of being shut down when you close your eye lids.  That’s why it is more difficult to sleep in a bright room even when you close your eyelids because some light still reach your eyes through your eyelids, and your eyes still register them.  That’s also why manufacturers of sleeping masks do a brisk business.   Sleeping masks further cut down the light reaching your eyes.

However, It takes metabolism to enable the eye to actually register light.  Each photon that reaches the retina triggers a photochemical reaction in the retina cell that leads to a nerve impulse being generated and sent to the brain.   Your body then need to supply of oxygen and neutrients to the retinal cell to reset its chemistry so It go back to ground state and be ready to register the next photon.  So it does take energy and neitrient to actually see.

I don’t know whether the rate at which the eyes refresh its photosensitive chemistry changes dramatically depending on how much light it actually registered.  

I saw some reports that blind people who suffered severed optical nerve between the eyes and the brain, but who retained functional eyeballs, still experience difficulty sleeping in bright light even though they can neither see images nor sense ambient brightness at all. This suggests the eye trigger something when it register light even when it doesn’t send any visual signal to the brain.

So It maybe that metablic requirements of the eye goes down substantially when there is no light to register.  This may trigger some rest response in the brain as well. This probably require a real vision scientist to answer.

(December 7, 2017 at 2:33 am)ignoramus Wrote: Here's a question.

Which animal doesn't have eyelids?

Steve Buscemi?

Boru

Insects blink at me in morse code.

(December 7, 2017 at 5:19 am)Alex K Wrote:

(December 7, 2017 at 3:49 am)pool the matey Wrote: Also, if we close our eyes and our eye is resting and we're "seeing dark" doesn't that mean if we open our eyes in a dark room our eyes are still resting? So how come we still have to close our eyes in a dark room for it to rest 😲

My idea is that they dry out more if they remain open, and have to work to blink regularly. Just keeping them closed keeps them nicely moisturized without having to blink all the time...

That and I'm sure your body would like to protect your eyes as much as possible while you're unconscious.

Having had six surgeries on my right eye I am heir to some ... interesting ... visual effects.

(December 7, 2017 at 1:10 am)pool the matey Wrote: Guys....
I just closed my eyes and we'll you know saw dark
So am I seeing dark or did my eyes "shutdown" and the end result is I saw nothing, ie, dark?
If I'm seeing dark my eyes are still working so how can it be that my eyes rest when I close them..? 🤔

Are you eight years old?  This is the equivalent of asking does the sun sleep when the moon is out.

Great lord FSM your trolling has gotten lazy.

Eyelids are overrated. They let light in, so if you have bright light your eyes will still capture some strong light if itr is around.
An experiment, look (briefly, < 1 second) at the sun. go to a dark room and close your eyes.

Is that light that you see, or the retina cells overloaded?

I was stupid enough when young to spend a whole afternoon welding with electrical arch without a mask. For those that want to test this, be pre,pared for a night of pure pain.

(December 7, 2017 at 6:01 am)Anomalocaris Wrote: Your eyes are not resting in the sense of being shut down when you close your eye lids.  That’s why it is more difficult to sleep in a bright room even when you close your eyelids because some light still reach your eyes through your eyelids, and your eyes still register them.  That’s also why manufacturers of sleeping masks do a brisk business.   Sleeping masks further cut down the light reaching your eyes.

However, It takes metabolism to enable the eye to actually register light.  Each photon that reaches the retina triggers a photochemical reaction in the retina cell that leads to a nerve impulse being generated and sent to the brain.   Your body then need to supply of oxygen and neutrients to the retinal cell to reset its chemistry so It go back to ground state and be ready to register the next photon.  So it does take energy and neitrient to actually see.

I don’t know whether the rate at which the eyes refresh its photosensitive chemistry changes dramatically depending on how much light it actually registered.  

I saw some reports that blind people who suffered severed optical nerve between the eyes and the brain, but who retained functional eyeballs, still experience difficulty sleeping in bright light even though they can neither see images nor sense ambient brightness at all. This suggests the eye trigger something when it register light even when it doesn’t send any visual signal to the brain.

So It maybe that metablic requirements of the eye goes down substantially when there is no light to register.  This may trigger some rest response in the brain as well.  This probably require a real vision scientist to answer.

"The sun miracle @ Fatima" lel.