The eye 0.0 / 5 ? BiologyCells, tissues and organsIGCSEAll boards Created by: AurielpawseyCreated on: 16-12-17 20:21 Ciliary muscle Controls the shape of the lens 1 of 18 Cornea Forms the outer protective membrane of the eye and bends the light in towards the pupil 2 of 18 Iris Gives the eye its colour and controls the amount of light entering the eye 3 of 18 Lens Changes shape in order to focus the light on the retina 4 of 18 Retina Receives the pictures, by turning the light into nerve impulses. 5 of 18 Optic Nerve Carries the nerve impulses to the brain 6 of 18 Aqueous humour The fluid in the outer cavity adding to the eye's strength 7 of 18 Vitreous humour The fluid in the inner cavity adding to the eye's strength 8 of 18 Choroid black layer, to prevent internal refraction, contains blood vessels 9 of 18 Sclera White protective outer layer 10 of 18 Fovea Area where most light is focused giving the clearest image. Highest density of cone cells 11 of 18 Suspensory ligaments Attach the lens to the ciliary muscle 12 of 18 Pupil Hole to let light through 13 of 18 Conjunctiva Another protective layer 14 of 18 What happens when the eye detects bright light? Radial muscles relax, Circular muscles contract, Pupil constricts: less light enters the eye to prevent damage to the retina. 15 of 18 What happens when the eye detects dim light? Radial muscles contract, Circular muscles relax, Pupil dilates: More light enters the eye to see better in the dark. 16 of 18 What happens in the eye when looking at a near object? Light rays need to be refracted a lot by the lens. The ciliary muscles contract and the suspensory ligaments slacken. As a result, the lens is round. 17 of 18 What happens in the eye when looking at a far object? Light rays do not require as much refraction, Ciliary muscles relax, suspensory ligaments pull tight. As a result, the lens is thin 18 of 18
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