State the difference between the two iris and pupil.

The iris and the pupil are both parts of the human eye, but they serve different functions and have distinct characteristics:

Iris:

The iris is the colored part of the eye located behind the cornea and in front of the lens.
It is a thin, circular structure with a central opening called the pupil.
The color of the iris is determined by the amount and type of pigmentation it contains. Common iris colors include blue, brown, green, and hazel.
The main function of the iris is to control the size of the pupil in response to changing light conditions. It does this by contracting or relaxing its muscles.
In bright light, the iris contracts, making the pupil smaller to reduce the amount of light entering the eye.
In dim light, the iris expands, making the pupil larger to allow more light to enter the eye and improve vision in low-light conditions.
The iris also plays a role in the aesthetic appearance of the eye.
Pupil:

The pupil is the black, circular opening at the center of the iris.
It appears black because it allows light to enter the interior of the eye, where it is absorbed rather than reflected back out.
The size of the pupil is not fixed; it can change in diameter.
The primary function of the pupil is to regulate the amount of light entering the eye. It works in conjunction with the iris to control the amount of light that reaches the retina.
The pupil's size is controlled by the muscles of the iris. In bright light, the pupil constricts (becomes smaller), and in dim light, it dilates (becomes larger).
Pupillary responses can also be influenced by emotional or physiological factors, such as arousal or the use of certain medications.
In summary, the iris is the colorful part of the eye that surrounds the pupil and controls its size to regulate the amount of light entering the eye. The pupil, on the other hand, is the central black opening that allows light to pass through and can change in size to adjust to different lighting conditions. Together, they play crucial roles in maintaining optimal vision and protecting the sensitive structures within the eye.