Eyes Closed I See So Clearly
Why practice we see different colours when nosotros close our optics? — Anais, anile 7
Howdy Anais, thanks for your great question!
The outset thing to say is that seeing colours when we close our optics is totally normal. It doesn't mean there'southward a problem with your eyes (unless what you run across changes drastically, but we'll talk near that later).
At that place are a few different situations that can crusade you lot to see colours with your eyes closed. The showtime one is if you close your eyes in the daytime, in a bright room or outside. Some light does go through your closed eyelids. And then yous might see a dark reddish color because the lids take lots of blood vessels in them and this is the low-cal taking on the colour of the blood it passes through.
Only often we see different colours and patterns when we close our eyes in the dark.
I certainly exercise! When I commencement shut my eyes in the night, I see a blueprint that's full of dots and sparkles. And then when I'g in the dark for a longer time, I see swirls and waves of coloured dots travelling through my vision.
I know what I'm seeing is not made by something existent, because it's always irresolute and seems very random.
You tin can also come across these with your eyes open up, particularly when yous've been in the dark for a while, maybe when you have woken upward in the middle of the dark (if in that location isn't too much stray light coming in from the window or elsewhere).
These perceptions are what scientists telephone call "phosphenes" — the sensation of light that'south not actually acquired by light. They can commencement in the eye or the brain, but the ones you are talking about are usually due to the normal functioning of the retina. The retina is the layer that lines the inside of the dorsum of your eye that detects light.
Why does it happen?
These phosphenes are a normal part of how our eyes work. Our eyes don't turn off in the dark, but instead they create very weak internal signals that mimic light.
These signals are constantly being fabricated by the cells at the back of your optics.
The swirls and waves we see are made by changes in activity from these cells. The blobs may be coloured because the cells in your eyes that detect colour likewise show this activity.
These signals are transmitted to the brain, and the brain interprets this random activity. Your encephalon doesn't know they weren't produced by real light, so we call back we're seeing coloured lights and patterns that are non there. It's a kind of illusion!
And what about when you rub your eyes?
You lot might besides meet colours when you rub your eyes. This is considering pushing (softly!) on your eyeballs causes physical forcefulness to be applied to the calorie-free detectors at the back of your eyes. This forcefulness can and then create the phosphenes nosotros've spoken virtually. Y'all might see a dark circle surrounded by a ring of low-cal where you take pushed on your eye.
Some people notice flashes of light when they motility their eyes quickly, particularly if they've gotten upwardly in the eye of the night in a night room. As nosotros get older, the clear jelly in the dorsum section of the heart gets more watery. This fluid can motility around a bit when the eye is moved quickly. Information technology can tug on your eyes' light detectors and causes you to come across a flash of lite.
Is there something wrong with us?
Seeing colours when you shut your eyes is totally normal. Information technology's but role of the way your eyes piece of work. Some people notice them, and some practise non.
However, much more obvious phosphenes can occur in some eye diseases.
If what you're seeing has inverse, and the patterns of light become much more noticeable or hang around for longer, it could indicate a problem.
For example, bright flashing tin can exist caused past a detached retina, which is where your retina partially comes away from the back of your eyeball, and which needs to be treated as an emergency.
As well, some people get a "visual aura" when they have a particular kind of headache called a migraine. High pressure inside your eyeballs can also cause phosphenes.
If what you're seeing has drastically changed, or y'all're worried about what you're seeing, it's best to visit your center care provider, a doctor or an optometrist.
Hello, curious kids! Practice you have a question you'd similar an practiced to answer? Enquire an developed to send your question to curiouskids@theconversation.edu.au
Source: https://theconversation.com/curious-kids-why-do-we-see-different-colours-when-we-close-our-eyes-154378
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