Eye structure download free6/11/2023 ![]() the ability of the eye to alter its focus so that clear images of both close and distant objects can be formed on the retina.lens is elastic & flexible thus it is able to change its shape.the cornea & vitreous humours are mainly responsible for bending of rays of light – refraction while the lens does the final adjustments to focus.an image which is smaller than the object is formed upside-down on the retina.the curved surfaces of the cornea & lens bends the light rays as they pass through them.light from an object forms a focused image on the retina. ![]() The retina: contains rods & cones Axon of the ganglion cell direction of light movement Ganglion cell Bipolar cell Synapse Rod Cone Pigment Sclera exit point of the optic nerve cutting through the retina so no rods or cones Blind Spot Optic Nerve carries the impulses from the rods and cones to the visual center of the brain. Fovea a tiny area of densely packed cones for detailed and coloured vision. Cornea bends incoming light focusing it on the retina. Lens accommodation & focusing of light onto the retina. Pupil a hole in the iris that lets light into the back of the eye. ![]() Iris controls the pupil size thus controls entry of light. Ciliary Body a ring of muscle controlling the shape and curvature of the lens. Retina contains rods and cones which convert light into nerve impulses. Sclera Choroid prevents internal reflection of light and nourish retina. Structure Function(s) tough outer layer of the eye which overs and protect eyeball. Internal Structure of the Eye sclera pupil choroids retina ciliary body / muscles iris lens cornea fovea blind spot optic nerve
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