Retina - Contains the light receptors, which trigger electrical impulses to be sent to the brain when light is detected., Optic nerve - Carries electrical impulses from the retina to the brain, Sclera - Protects the eyeball from damage., Cornea - Refracts light as it enters the eye (by a fixed amount)., Iris - Controls how much light enters the pupil., Pupil - Hole that allows light to pass through as it enters the eye., Lens - Refracts light to focus it onto the retina. The amount of refraction can be adjusted by altering the thickness and curvature., Ciliary muscles - Can contract and relac to change the shape of the lens to make it more or less curved, so as to increase or decrease the refraction of light., Suspensory ligaments - Loosen or tighten as the ciliary muscles contract or relax, to adjust the thickness and curvature of the lens.,

Eye Structures and Functions

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