Iris - A coloured disc with an opening, the pupil. It controls how much light reaches the retina , Crystalline lens - A flexible, biconvex structure that focuses light on the retina , Cornea - A transparent layer, linked to the sclera. It refracts and focuses light., Arqueous humour - A fluid between the cornea and the lens., Vitreous humour - A jelly-like substance that helps to keep the shape of the eye .Located between the lens and the retina., Retina - Inner layer.It contains two types of photoreceptors:rods and cones, Optic nerve - It trasmits nerve impulses from the retina to the brain., Chorold - Middle layer.Its capillares provide nutrients to the inner eye., Sclera - White outer layer.The front is covered by a membrane,the conjunctiva, Extraocular muscles - They control eye movement.,

Parts of the human eye & their function

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