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rays reflect off the cornea. Then the rays are refracted by the
lens and vitreous. The lens focused the rays on the retina.
This image is upside-down. Then the rays are converted to
electrical impulses which then go through the optic nerve to the
brain. This will turn the image to an upright position.
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The eye is like a camera. A camera needs a lens to produce an image. The same way that an eyeball needs a lens (cornea, crystalline lens, vitreous) to focus or refract the light and a film (retina) where you focus the rays. If any of these are not working you get a poor picture. The retina represents the film. Here it collects images and sends it to the brain to be processed. If one of these do not work correctly then there will be a blurry picture. The macula is a highly sensitive area of the retina. The macula is for focusing the vision. This is the part of the retina that is most used. Say you are playing the stare game (when you stare into someone's eyes and the first person to blink loses) and you did not have a macula this would be impossible. |
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