What part of the eye controls the amount of light entering?, Optic nerve, Retina, Iris, Cornea, What is the opening in the center of the iris called?, Lens, Pupil, Fovea, Sclera, Which part of the eye focuses light onto the retina?, Lens, Vitreous humour, Optic disc, Choroid, Which layer contains photoreceptors (rods and cones)?, Cornea, Sclera, Conjunctiva, Retina, What is the clear front covering of the eye called?, Sclera, Retina, Choroid, Cornea, What is the tough white outer layer of the eye called?, Sclera, Pupil, Iris, Lens, Which part sends visual signals to the brain?, Ciliary body, Cornea, Optic nerve, Aqueous humour, Where is the blind spot located?, Pupil, Optic disc, Cornea, Fovea, Which structure changes lens shape to focus?, Retinal cones, Ciliary muscles, Sclera, Optic nerve, What fluid fills the space between cornea and lens?, Aqueous humour, Tears, Blood, Vitreous humour.

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