What is the structure and function of iris in human eye?
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The iris is a thin circular structure in eye and it is responsible for controlling the diameter and size of the pupil....................
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Iris of the Human Eye
The iris of the eye is the colored ring just behind the clear, outer layer of the eye's cornea. Behind the iris is the crystalline lens, which helps to refract light. In the center of the iris is the pupil, the black hole that changes size. The iris is made of connective tissue, smooth muscle fibers, and pigments that give the iris its color.
The pigments in the iris are made of melanin (the same pigment that gives skin its color) and lipochrome. The amount of pigment in the eye creates eye color. Before you were born, genetics determined your eye color and the unique structure of your iris was laid out. On one end of the spectrum are eyes with no pigment, which are the pink eyes of a person with albinism. A little pigment makes the eye blue. Then in increasing amounts of pigment are green, hazel, and finally, brown eyes, which have the most pigment.
Occasionally, someone has an eye that is one color and another eye that is a completely different color. And just to set the record straight, once you are an adult, your eyes don't change color. They can look different depending on what you are wearing or the light that surrounds you, but they aren't changing color.
The iris of the eye is the colored ring just behind the clear, outer layer of the eye's cornea. Behind the iris is the crystalline lens, which helps to refract light. In the center of the iris is the pupil, the black hole that changes size. The iris is made of connective tissue, smooth muscle fibers, and pigments that give the iris its color.
The pigments in the iris are made of melanin (the same pigment that gives skin its color) and lipochrome. The amount of pigment in the eye creates eye color. Before you were born, genetics determined your eye color and the unique structure of your iris was laid out. On one end of the spectrum are eyes with no pigment, which are the pink eyes of a person with albinism. A little pigment makes the eye blue. Then in increasing amounts of pigment are green, hazel, and finally, brown eyes, which have the most pigment.
Occasionally, someone has an eye that is one color and another eye that is a completely different color. And just to set the record straight, once you are an adult, your eyes don't change color. They can look different depending on what you are wearing or the light that surrounds you, but they aren't changing color.
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