Question

what is the function of iris
Answer -
1. To decide the size of pupil
2. To give colour to the human eye​

Answer 1

Answer:

The iris controls the amount of light that enters the eye by opening and closing the pupil. The iris uses muscles to change the size of the pupil. These muscles can control the amount of light entering the eye by making the

pupil larger (dilated) or smaller

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Answer 2

Explanation:

The iris is the coloured circular structure concentrically surrounding the center of the eye, the pupil, which appears to be black. The size of the pupil, which controls the amount of light entering the eye, is adjusted by the iris's dilator and sphincter muscles. A device known as an ophthalmoscope is used to see inside the eye. 

A given colour stimulates all three types of receptors with varying effectiveness, and the pattern of these responses determines the colour perceived. In 1986 researchers identified the genes that correspond to the red, green, and blue pigments.