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- Good morning students, Today we will talk about the eye parts
- the parts of the eye are: eyelid, iris, retina, pupil, cornea, lens and optic nerve
- Light enters the eye through the cornea, the clear, curved layer in front of the iris and pupil. In addition to acting as a protective layer for the front of the eye, the cornea also helps focus light on the retina at the back of the eye.
- After passing through the cornea, light passes through the pupil, the black spot in the center of the eye.The iris, the colored circular area of the eye that surrounds the pupil, controls the amount of light that enters the eye. The iris allows more light to enter the eye when the environment is dark, and allows less when there is more light.
- Behind the iris is the lens, which changes shape to focus light on the retina. Through the action of small muscles (called ciliary muscles), the lens becomes thicker to focus on nearby objects and thinner to focus on distant objects.The retina contains cells that perceive light.and the blood vessels that nourish them
- from the retina convert the image into electrical impulses, which are transmitted to the brain by the optic nerve. There are two main types of receptors: rods and cones.
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