Physics: The Eye

Question	Answer
The Cornea	The cornea is a transparent 'window' with a convex shape and a high refractive index.
The Iris	The iris is the coloured part of the eye. It is made up of muscles that control the size of the pupil and intensity of light entering the eye.
The Lens	The lens changes shape to focus light from the objects at variable distances. It's connected to the ciliary muscles by the suspensory ligaments.
The Retina	Images are formed on the retina, which is covered in light-sensitive cells. These cells detect light and send the signal to the brain to be interpreted.
The Far Point	The far point is the furthest distance that the eye can focus comfortably.
The Near Point	The near distance is the closest distance the eye can focus on.
Short Sight	Short sight is when you can't focus on distant objects. This is because the eyeball is too long . It can be corrected by diverging lenses.
Long Sight	Long sighted people can't focus on near objects. This happens when the cornea and lens are too weak or the eyeball is too short. It is corrected with converging lenses.
Eye Surgery	Eye surgery uses narrow and intense lasers to correct eyes. The laser is used to vaporise some of the cornea to change the persons focus ability.

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	Created by charlottec1999 almost 10 years ago