Knowledge About Photo receptor (Human Eye)

In this post, I will discuss Knowledge About Photoreceptors (Human Eye). You guys know that receptors are the parts of the body that receive the change (stimuli) taking place in our environment. In the Human Body, there are many types of receptors, which perform their different function. Which are the following you can see in this Post.

• Photoreceptors perceive light e.g eyes.
• Sono-receptor perceives sound waves e.g ears.
• Chemoreceptors perceive different chemicals like the tongue and nose.

So these are a few bit of receptors that perform their function. There are many functions of the Receptors but I will discuss a few of the above you can see. Now it's the time that I will discuss the Photoreceptors which are also known as Human Eyes. In this post, I will also show the images of the human eye. The first is the human eye.

Photo Receptors (Human Eyes)

So Photoreceptors are the Human Eye. And it is also called the visual receptor. Photo means light and receptor mean receive. So photoreceptors are the Human Eyes that receive light as a stimulus. Now the next thing is that How is the Structure of the Human Eye is. So the structure of the human eyes are the following;

Structure Of the Human Eyes:

The structure of the Human has been divided into two portions which are the following;

1: Walls

2: Structures.

So, first of all, I will Discuss the Walls and then I will discuss the structures of the human eyes, so I am trying my best to discuss these two structures step by step. You guys can see this in this post. So the first one is;

Walls:

Walls are the structures that provide support to the inner structures of the eyes. walls are divided into three Layers which are the following;

Outer Layer:

It is the protective layer that has two sides i.e interior called the sclera. The sclera is the Part of the eye that is posteriorly called and sclera. And The other is Cornea. The cornea and sclera Both provide protection to the eye. The cornea is the tough, whitish transparent layer that gives protection from the other sides.

Middle Layer:

So the middle layer is the second layer of the eye in the walls which is also known as the vascular layer. So this layer has three parts which are the following;

1: Chorid:

It provides nutrition to the eye. this is called the chorid.

2: Ciliary Body:

It is the second part of the Middle layer. It is a finger-like projection extended from the chorid, which is a bit thickened.

3: Iris:

The space between the ciliary bodies at the center is called Iris.

Inner Layer:

It is called the retina. This layer has two portions. The outer is called the pigments and the inner is called the neral layer which has rods and cones. Now you have a question in Your mind that what are rods and cones. So rods are used to receive light, it will give the image. Now is the cones, so cones identify colors.

Now I will discuss the structures of the Eyes.

Structures

The structures are the following;

1: Pupil:

At the center of the iris small hole is presently called the pupil. Now, what is its function? Its function is, it controls the intensity of light. If the light is dam the pupil becomes wider. Now if the light is full then it becomes small.

2: Lense: 

Behind the pupil by the convex lens are present which targets light upon the retina. So this is called the lens.

3: Suspensory Segments:

These are the muscles that hold the lens in between.

4: Aqueous Chamber:

The space between the cornea and lens is called the aqueous chamber. Here in the aqueous chamber, the fluid is present in this chamber is called aqueous humor. 

5: Vitreous Chamber: 

The space between the lens and retina is called the vitreous Chamber. Here also in the vitreous chamber, the viscous fluid of the chamber is called the vitreous humor. 

6: Optic nerve: 

The nerves which convert electromagnetic wave into electrochemical impulses and transfer to the brain is called the Optic nerve. 

7: Blind Spot:

At optic nerves, no photoreceptors cells are present no absorption of light occurs which is why called the Blindspot.

Mechanism Of vision

Lens direct Light rays to the retina where rod and cones are present in their axons (neurons) are part of optic nerves which carry impulses from retina to the brain and produce sensation for shape and color of the object. So this is the Short theory of the Mechanism Of Vision.

So these are all about Knowledge About the Photoreceptors (Human Eye). In my next post, I am trying to discuss the two disorders of the human eye. Which are the Shortsightedness and the Longsightedness.