QUESTION: Which of the following is not a part of human eye?
A Iris
B Eyeball
C Cornea
D Cochlea
ANSWER: Cochlea
| Parts of eye | Description | Function |
| Cornea | Transparent front surface of the eye | Its function is to focuses and refracts light onto the retina. |
| Iris | Colored portion of the eye | Regulates the amount of light entering the eye (pupil size) |
| Pupil | Dark circular opening in the center of the iris | Controls the amount of light entering the eye |
| Lens | Transparent structure behind the iris | Refracts light further to focus it on the retina |
| Retina | Layer of light-sensitive cells at the back of the eye | Converts light into electrical signals for the brain |
| Fovea | Small depression in the center of the retina | Responsible for sharp central vision |
| Optic Nerve | Bundle of nerve fibers that carries visual signals | Transmits visual information from the retina to the brain |
| Sclera | White outer layer of the eye | Provides structural support and protection |
| Choroid | Layer between the retina and sclera | Supplies blood to the retina and absorbs excess light |
| Aqueous Humor | Clear fluid in the front chamber of the eye | Helps maintain eye pressure and nourishes the cornea |
| Vitreous Humor | Gel-like substance filling the back of the eye | Helps maintain the eye’s shape and supports the retina |
| Ciliary Muscles | Muscles surrounding the lens | Control the shape of the lens for focusing on near objects |
| Optic Disk (Blind Spot) | Area where the optic nerve exits the eye | Lacks photoreceptors which results in no vision at this spot |