Our eyes work by bending light, due to which our brain makes an image, this process equally on both land and water surface.The human eye has evolved to work perfectly on the ground. If we remember the days of science then it will remember how complex the human eye is...
The three main parts of the human eyes that help to clearly see any object.
- Cornea the lens, which bends and focuses the light to form an image. The cornea and lens in the eye act as the camera lens. The cornea contributes 60-75 percent of the total concentrated power of our eyes. The human cornea is highly circular in comparison to other organisms.
- Retina, which sends that image to the brain, the retina is similar to the film. If the image is not focused properly, the film (or retina) receives a blurry picture.
So how animals see in the water?
The animal which spends their entire life underwater, their visual system is different from our visual system. For example, the eyes of fish which only rely solely on own lenses, But the human lens is biconvex (curved on both sides, like the lens of a telescope), the fish lens is spherical, which helps to bend better under the light water because they do not trust the cornea. Many organisms can be seen below water and above, the seals and the penguins have relatively flat cornea which can see more easily underwater as compare to us.
There are documented groups of people who can see underwater better than most, however, there are people like "Thai Moken "which are known as the "Sea Nomads," which have been lived in the form of a sea culture for thousands of years and they have developed the ability to see underwater. A 2003 study of Thai Moken children suggested they achieved this feat by shrinking their pupils to an extreme degree.
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