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Transcript of The Eye
The 'Iris' controls how much light enters the pupil by contracting and expanding its muscles.
Parasympathetic nerve fibers control constriction of the pupil. Sympathetic nerve fibers control dilation of the pupils.
almost like a camera shutter. It opens and closes to let a certain amount of light in. The 'Iris' and 'Pupil' What is the 'Lens' and the 'Ciliary muscles'? The 'Lens' focuses on objects judging by the width which is controlled by the 'Ciliary muscles'. The refracted light is focused onto the... The 'Retina is a web of nerves designed to catch light and convert it to electrical signals. In a way, it's like the film at the back of a camera. These signals travel to the brain by... The retina The 'Optic Nerve' The Optic Nerve is the second of 12 paired 'Cranial Nerves' but is technically still apart of the central nervous system. Consider it the highway in which images travel towards the brain for processing. The tear gland helps keep the eye hydrated. The 'Lacrimal gland' also known as the tear gland, produces a liquid made of: mucous, water, and oil. This liquid cleanses the eye and drains it to the nose. The 'Sclera' is a white, tough outer layer designed to protect the eye from invasive objects. It has a total of six muscles attached to it so it can move up, down, and side to side. The 'Sclera' A tissue of the eye that helps with night vision. Animals have more 'Tapetum Lucidum' which gives them better night vision than humans and makes their eyes glow in dim lighting. They have more 'Tapetum Lucidum' because they evolved to hunt at night. The 'Tapetum' Corrective lenses help with eye deformaties such as Myopia, Hyperopia, Presbyopia, and Astigmatism. All of these are kinds of deformaties which cause a hardship of focusing. Corrective lenses like Concave and Convex lenses can help with focusing. Even though eye deformaties exist, we can fix them using different procedures such as the LASIK surgery. LASIK surgery is a procedure where a flap of the cornea is folded back and a laser is shined into the eye to reshape the lens to the proper form THE EYE