Eyes
Shark eyes are similar to yours. The eyeball has a cornea, iris, pupil, lens and retina. Scientists say sharks have lateral eyes, which means they are located on the side of the head. Some species have an eyelid like structure called a nictitating membrane, which protects the eye from being injured by thrashing prey while the shark is feeding.
The size of sharks eyes, and the exact position vary. Deep-water sharks generally have large emerald green eyes, the better to see the luminescence of other animals who also dwell where little sunlight reaches. Shallow-water sharks, living closer to sunlight, tend to have smaller eyes.