Question

what is the function of iris?​

Answer 1

$\huge\bold\red{Iris}$

Via dilation (opening) and constriction (closing), the iris plays a key role in regulating the amount of light that accesses the retina in the back of the eye.3 When there’s low light, it will dilate to maximize the available visual information, and when it’s very bright out, it constricts to prevent overwhelming the visual sensory apparatus. The former is performed by contraction of the radial muscles, whereas the latter activity involves the circular muscle. This activity is regulated by the cortex, and can also be influenced by physiological states, such as arousal and excitement.

In addition, this structure performs the “accommodation reflex,” which is the eye’s involuntary ability to switch focus from objects that are nearby versus far away.4 This activity, which entails changing the aperture (opening) of the pupil, the shape of the lens, and convergence (the ability of the eyes to work together when looking at nearby objects), is regulated by the parasympathetic nervous system. Alongside the sphincter pupillae—structures at the borders of the iris that regulate its shape and motion—this part of the eye can narrow the pupil to prevent blurring due to divergent light rays accessing the eye.

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Answer 2

Hi there!

Your Answer :-

Iris is a colored part of an eye.

It helps in focusing light Ray's in retina.

It also regulates the amount of light which is entering the eye.