scratch line fire up enters the pith with the pupil after that the permit down passe s through the color part of the eye called the iris. If the write down is very bright the uncontaminating in the iris contract to fare the pupil smaller to protect the eye from damage. The contraction of the verve helps to see better in set out. In dim light the muscle must relax to open the pupil wider to let in as much light as possible. In the pupil the light moves through the lens which focus light to focus on objects that are closer or further away ...If you want to get a full essay, hallow it on our website: OrderCustomPaper.com
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