what are the two kinds of cellsin human eye? and also draw a labeled sketch of the human eye?
Answers
Answer:
two kind of cellidm eye are cell and non cell
yo
Answer:
What is Human Eye?
The eye is an important and one of the most complex sense organs that we humans are endowed with. It helps us in visualizing objects and also helps us in light perception, color and depth perception. Besides, these sense organs are pretty much similar to cameras, and they help us see objects when light coming from outside enters into them. That being said, it is quite interesting to understand the structure and working of a human eye. It also helps us in understanding how a camera actually functions. Let’s have a glance at the human eye – it’s structure and functions.
Structure of Human Eye
A human eye is roughly 2.3 cm in diameter and is almost a spherical ball filled with some fluid. It consists of the following parts:
The picture
Sclera: It is the outer covering, a protective tough white layer called the sclera.
Cornea: The front transparent part of the sclera is called cornea. Light enters the eye through the cornea.
Iris: A dark muscular tissue and ring-like structure behind the cornea is known as the iris. The colour of the iris actually indicates the colour of the eye. The iris also helps regulate or adjust exposure by adjusting the iris.
Pupil: A small opening in the iris is known as a pupil. Its size is controlled by the help of iris. It controls the amount of light that enters the eye.
Lens: Behind the pupil, there is a transparent structure called a lens. By the action of ciliary muscles, it changes its shape to focus light on the retina. It becomes thinner to focus distant objects and becomes thicker to focus nearby objects.
Retina: It is a light-sensitive layer that consists of numerous nerve cells. It converts images formed by the lens into electrical impulses. These electrical impulses are then transmitted to the brain through optic nerves.
Optic nerves: Optic nerves are of two types. These include cones and rods.
Cones: Cones are the nerve cells that are more sensitive to bright light. They help in detailed central and colour vision.
Rods: Rods are the optic nerve cells that are more sensitive to dim lights. They help in peripheral vision.
At the junction of the optic nerve and retina, there are no sensory nerve cells. So no vision is possible at that point and is known as a blind spot.
An eye also consists of six muscles. It includes the medial rectus, lateral rectus, superior rectus, inferior rectus, inferior oblique, and superior oblique. The basic function of these muscles is to provide different tensions and torques that further control the movement of the eye.
