cornea - This helps your eye to focus as light comes through, iris - The ring of muscle which changes the size of the pupil to let different amount of light through, optic nerve - The nerve which sends the image from the eye to the brain., retina - The back of the eye which is sensitive to light., lens - The transparent part which changes shape for you to see near or far., photon - The name of light particles, opaque - A material which lets no light through, transparent - A material which lets light through, translucent - A material which lets some light through, straight line - Light travels in a ...........,

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