Health & Fitness This is why you see colours when you rub your eyes

09:10  13 february  2018
09:10  13 february  2018 Source:   MSN

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We’ve all experienced it – when you rub your eyes too hard, or press your fingers against them, your vision is filled with an array of colours either as spots of brightness or strange twisting spirals.

Well, there’s actually a scientific term for the colourful “stars” you see in your vision, called phosphenes: this is when your eyes experience the sensation of light, without light actually entering them.

There’s lots of different ways you can see phosphenes; if you accidently hit your head, they could come as flickering bright white light, and pressing your eyes shut tightly will bring “spots” to your vision. The experience of pressing your eyes and seeing colours is “pressure phosphenes”.

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Hope you enjoyed this Vision Tip of the Week and you now understand why when you close your eyes you may be treated to a starry, starry When you rub your eye ,there is retinal changes causing photoreceptors which adsorb photons and light causing those colors seen when you close your eyes .

Why do we experience this?

Our eyeballs possess a neuron called a retinal ganglion cell, which receives visual information from the photoreceptor cells in the retina. This is what contributes to our vision – the retinal ganglion cell receives information from the photoreceptor cells being stimulated by light entering the eyes.

  This is why you see colours when you rub your eyes © Provided by Independent Print Limited

These retinal cells can also be activated by applying pressure, which gets them working in a similar way to when they’re activated by light.

Essentially, you’re tricking your nervous system into thinking your eyes are open.

You can also experience phosphenes when you have a migraine, though scientists aren’t certain why this is the case. It may be the result of electrical activity in certain parts of the brain.

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