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The human eye is spherical in structure adjoined by six extrinsic muscles to bones and other muscles in the skull. These external muscles control the movement of the eyeball. The eyeball is enclosed by three layers of fibrous tissue, which are covered by a fine transparent membrane called the conjunctiva. 
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The thin transparent layer seen is the cornea
the coloured part is iris it controls the light entering our eye. then we hv lens which is convex in retina we hv rods nd cones
rods are sensitive to dimlight cones r sensitive to bright light ciliary muscles control d focal length of d eye