Shell of the Eye Iris, Iris (Iris)

Eye Shell Iris, Iris (Iris): Regulator of light and eye color

The lining of the eye, known as the iris or iris, is one of the key parts of the eye that performs a number of important functions. Located in front of the lens, the iris regulates the amount of light entering the eye and gives the eye its characteristic color.

The main structure of the iris is muscles and pigment cells. In the thickness of the iris there are two muscles: the circular sphincter of the pupil and the radial bundles of the dilator of the pupil. The circular pupillary sphincter is a circular muscle that surrounds the pupil, the central opening of the iris. Radial pupil dilator beams, directed from the center to the edges of the iris, control pupil dilation.

The role of the iris is to regulate the size of the pupil in response to different light levels. In bright light, the circular muscles of the iris contract, causing the pupil to constrict. This limits the amount of light entering the eye and protects it from excess light. A constricted pupil also improves image clarity because it reduces the depth of the visual field and focuses light on the retina.

On the other hand, in dim light, the radial fascicles of the pupillary dilator contract, causing the pupil to dilate. This allows more light to enter the eye, increasing its sensitivity to low light. A dilated pupil can also be an expression of an emotional state or a physiological response such as fear or excitement.

In addition, the iris plays an important role in determining eye color. Eye color is determined by the pigmentation of the iris, which can vary from person to person. For example, eyes can be blue, green, brown, etc. The variety of eye colors is due to different levels and types of pigments in the iris.

Structurally, the iris is attached to the ciliary body of the eye, which plays an important role in the accommodation of the eye, that is, in changing the focal length of the eye to see at different distances.

The Iris is an amazing structure that not only protects the eye from excess light, but also adds individuality and beauty to every person. Its ability to regulate pupil size and determine eye color makes the iris an important element in the functioning of the visual system.

The iris is part of the choroid located in front of the lens and performs the important function of regulating the amount of light entering the eye. Light rays pass through the central opening of the diaphragm - the pupil, which is regulated by two muscles: the radial dilator fascicle and the circular sphincter.

Eye color depends on the pigmentation of the iris, which is caused by the presence of special cells. When bright light hits the iris, the circular muscles contract, causing the pupil to constrict. In dim light, the radial muscles dilate the pupil.

The outer edge of the iris is attached to the ciliary system of the eye, which allows the eyeball to move and focus images on the retina.

Thus, the iris is an important part of the visual apparatus and plays an important role in regulating the entry of light into the eye and ensuring normal vision.

The eyes are one of the most unique organs in our body. Each eye contains a huge number of structures that help us perceive the world around us. One of the important parts of the eye is the iris, or iris, which is located in front of the lens.

The lining of the eye, called the iris or iris, is a circle