The biological structure of human eye
Biology
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The human eye is a complex biological structure responsible for vision. It functions by capturing light and converting it into electrochemical impulses that are sent to the brain.
Key structures and their roles:
- Cornea: The transparent outer layer that covers the iris, pupil, and anterior chamber. It refracts light.
- Iris: The colored part of the eye that controls the size of the pupil, regulating the amount of light entering the eye.
- Pupil: The opening in the center of the iris that allows light to enter the eye.
- Lens: Located behind the iris and pupil, it further refracts light and adjusts its focus to form a clear image on the retina.
- Retina: The light-sensitive tissue lining the back of the eye. It contains photoreceptor cells (rods and cones) that convert light into electrical signals.
- Optic Nerve: Transmits visual information from the retina to the brain.
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