The eyes are a vital organ of our body. The basic role of our eyes is to convert the light to electrical signals which are called nerve impulses where our brain converts the images of our surroundings. The light rays pass through the pupil in the cornea.
Wearing glasses is a common factor these days. Some wear glasses for fashion, and some wear them for need. Thus glasses play a significant role in our eyes. We can use glasses that block blue light, and can even buy prescription glasses online. This helps us for better vision and eyesight.
While buying glasses we also get the facility of trying online glasses at home which has made our life easier and smooth. Glasses are not only worn for fashion, but also they protect our eyes from various external factors. They are also responsible for shaping the overall look of our bodies.
Structure of the Eye
There is a specific structure of our eyes that contains various parts. Each part has a different function. They are as follows-
- Orbit- It is the bony cavity that contains the eyeballs, nerves, muscles, blood vessels, and the structures that produce drain tears. Each orbit is pear-shaped and is formed by several bones.
- Sclera- It is the white outer covering of the eyeball which is relatively tough and is white. It is often known as the white eye.
- Conjunctiva- There is an area that is protected by the eyelids near the front end of the eye, the sclera is covered by a thin and transparent membrane called the conjunctiva. It runs to the brink of the cornea. It also covers the surface of the eyelids and eyeballs.
- Cornea- It is the clear, curved layer in front of the iris and pupil through which light enters the eye. It acts as a protective shield for the front eye and also helps to focus the light on the retina.
- Pupil- It is a black dot in the middle of the eye, through which light travels after the cornea.
- Iris- The pupil which controls the amount of light that enters the eye, is the circular coloured area of the eye that surrounds. The pupil dilates and constricts as the amount of light in the immediate surroundings changes. The pupil size is controlled by pupillary sphincter muscle and dilator muscles’ action.
- Lens- Behind the iris is the lens. The light is focused on the retina through the lens by changing its shape. Through the action of ciliary muscles, the lens becomes thicker and thinner to focus on nearby and distant objects.
- Retina- It contains the cells that sense light and the blood vessels nurture them. The macula is a small area and the most sensitive part of the retina.
- Cones and Rods- Cones are responsible for sharp, detailed central and coloured vision whereas rods are responsible for side vision and are more in number and are also more sensitive to light.
- Aqueous and Vitreous humor- The front section is called the aqueous humor and the back section is called the vitreous humor. Those are also called anterior and posterior humor and both are jelly-like fluids present in our eyes.
Thus this is the structure of our eye in short but a detailed version from which one can get the basic idea of the structure of the eye. We should take proper care of our eyes so that we may not restrict ourselves from viewing the best pictures in the world.