Your Eyes
What happens to your eyes when they go bad?
I always wondered.
What I mean by "bad," is when you start to need contacts or glasses.
I know that you see with your brain and that your eyes are more of a window than What You actually see out of... so, is it just neurons or something dying in your brain and that's why your eyes go bad? I know your eyes going bad is also genetic, so is it something in the brain that shuts off?
Just curious and would like to know, thanks!
Nope, your brain will not shut off the eye. That condition is called lazy eye or amblyopia.
No one knows exactly why eyes become worse or better. It has absolutely nothing to do with what you eat or how long you wear glasses. Whatever changes happen in your eyes are simply in your genes.
^^There is an exception though. When we get older, our eyes can lose the ability to focus properly. Thats why many adults need reading glasses.
In someone who has myopia (or nearsightedness), the images they see are focused in front of the retina (which is pretty much the T.V. screen for your brain). The brain then receives an unfocused image, one that is blurrier in the distance. This unfocused image is because the eyeball is (or becomes) a little too long.
http://www.allaboutvision.com/conditions/myopia.htm
In someone who has hyperopia (farsightedness), the images are focused behind the retina, making closer objects blurrier. This happens because the eyeball is too short.
http://www.allaboutvision.com/conditions/hyperopia.htm
Glasses or contacts are used to make the image focus in the right spot on the retina.
http://science.howstuffworks.com/lens.htm
Hope I helped!
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