Question

difference between iris and pupil

Answer 1

The iris separates the anterior and posterior chambers of the eyeball. The iris, by contraction and dilatation, regulates the entrance of light into the eye. The iris controls the size of the pupil. For spherical refracting lenses, like the one in your eye rays that are further from the optical centre are bent more than those closer to the centre. The result is that when the image is formed on the retina, it may be slightly out of focus. The iris reduces the number of these rays by forming a barrier over the parts of the lens in the eye which might cause this, and thus producing a more sharply focussed image on the retina.

The pupil controls the illumination in the eye, and improves the optical quality of the image on the retina. It regulates the amount of light that enters the eye. The pupil is the hole that lets light enter the inner eye.

Pupil is the hole located in the center of the iris.

Answer 2

Answer: Iris is a contractile structure that is composed of smooth muscles surrounded by the pupil. Pupil is a small black hole within iris.

With the help of pupil, light enters into the eye and the intensity of light is regulated by iris.

As a result, iris helps in controlling the size of the pupil by controlling the intensity of light.