Why can't humans focus their eyes underwater without goggles?

Answer 1

Light rays bend when they enter from one medium to another of different density. The amount of bending is determined by the refractive indices of the two media. If one medium has a particular curved shape, it functions as a lens. The cornea, humours, and crystalline lens of the eye together form a lens that focuses images on the retina. Our eyes are adapted for viewing in air. Water, however, has approximately the same refractive index as the cornea (both about 1.33), effectively eliminating the cornea's focusing properties. When our eyes are in water, instead of their focusing images on the retina, they now focus them far behind the retina, resulting in an extremely blurred image from hypermetropia.

Answer 2

They can, try it for yourself. But somethings in the bottom of you bath tub put your face in and open up your eyes, you can focus your eyes underwater. I don't know if it will work for you but it did work for me.

Answer 3

If you dont use gogles and just open your eyes it will be blury and burn for a second if you use gogles then you should be able to see clearly and it wont burn.

Answer 4

well the water magnifies whatever that's inside, its the the particles work

Answer 5

Because under water city cannot be build.