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What are the different parts of the human eye and their function

Answer» \tPupil- The inner aperture that we can see in the centre of the eye is known as pupil. It is like a hole through which light enters the eye.\tIris- It is coloured part of the eye and is involved mainly in controlling the size of pupil. The iris increase and decrease the size of pupil and regulate the amount of light that enters through the pupil.\tSclera- The white part of the eye that we can see is known as sclera. It is filled with a clear watery fluid.\tCornea- It is a thin transparent tissue that covers the front of the eye.\tRetina- Just behind the eyeball, there is a lining called the retina. It is retina that is sensitive to light and has receptors called rods and cones. The rods and cones respond to light and generate impulses.\tRods are the cells which are sensitive to dim light.\tCones are the cells which are sensitive to bright light.\tCiliary Muscles- They controls the focal length of the eye lens.\tLens- It is the transparent tissue between pupil and retina. The lens helps in focusing the light that passes through the pupil into eye. This helps in focusing the image on the retina, by bending the light rays.\tOptic Nerve- It connects the eye to brain and carries impulse to and from the brain.\tBlind Spot- The portion on retina where the nerves fibres enters the optic nerve. This portion does not have any rods and cones. The image falling on this portion of retina cannot be seen. This spot is known as Blind Spot.
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