Correct Answer - Option 4 : Pupil
Concept:-
- The eye is a circular structure located in the orbits, light passes through the cornea and the pupil at the front of the eye and is focused by the lens onto the retina at the back of the eye.
The inside of the eye is divided into three chambers:
1. Anterior Chambers: is between Cornea and the Iris
- While Iris uses muscles to change the size of the pupil. In this way, the Iris controls the amount of light that enters the eye by opening and closing the pupil.
2. Posterior Chamber: lies between the Iris and the lens
- The light from the pupil passes through the lens. The lens is elastic as the muscles attached to it allow eyes to focus on an object depending upon the distance of the object.
3. Vitreous Chamber: is between the lens and the back of the eye.
- This chamber is lined with a special layer of cells called the retina, consisting of highly sensitive nerve cells that convert light into nerve impulses. These nerve fibers in the retina merge to form the optic nerve, which leads to the brain. The optic disc or nerve is the point where the axons from retinal ganglion cells leave the eye.
The macula near the center of the retina at the back of the eyeball provides a sharp central vision for focussing on the object in front.
- Additionally, the chambers in front of the lens i.e. anterior and posterior chambers are filled with a clear fluid called aqueous humor. On the other hand, the vitreous chamber is filled with thick, gel-like fluid called the vitreous humor. Also, these two fluids aid the eye in maintaining eyes its shape.
