Fill in the Blanks IGCSE BIO: The EyeOnline version the eye by Tharwat A 1 retina cones receptors colour dim rods light The retina Light passes through the eyeball to the . There are two main types of light - and . Rods are more sensitive to than cones so they are useful for seeing in light . There are three different types of cone cells which produce vision . 2 pupil muscles response reflex size controlled changes iris The pupil reflex The amount of light entering the eye is by a action . The of the in to bright or dim light . This is controlled by the of the . 3 shapes Lens cones rods Retina messages colours Iris Pupil brain image light size sensitive retina - Coloured circle around the pupil . It controls the of the pupil - Black part of the eye . This is an opening that lets in - This focuses light onto the - Light - layer at the back of the eye . It is made up of and Rods - Sense cells that help us see the of things Cones - Sense cells that help us see Optic nerve - Carries from the retina to the . The brain turns these into an of what we are looking a t
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