Optics

... Eye Defects Vision:- The mammalian eye could be regarded as a miracle of evolution. In order to produce an image the eye has to act as an Optical refracting System (to focus a sharp image) and a Photo Detector (to analyse the image and send information to the brain). At the front of the eye is the optical system, made up of the transparent curved Cornea and the adjustable biconvex Lens. The photo detector is the layer of light-sensitive cells at the back of the eye, called the Retina. The amount of light entering the eye is controlled by the Iris. Sharp focusing is achieved by altering the shape of the lens. The shape of the lens is controlled by the ring of ciliary muscle which runs round the outside of the lens. (http://www.riverdeep.net/current/2002/01/012002_images/eye.jpg) Defects in the eye:- 1. Long Sight (Hypermetropia) In this condition we can see distant objects more clearly that ones that are

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