To protect their eyes from being injured or getting debris in there. Most sharks actually do this, not just white sharks. Or have a protective film that covers their eyes like an eyelid. Also they do this while feeding as well as fighting. The best answer that marine biologists have come up with is that sharks eyes are very sensitive and by rolling them back it protects them from what might hit their eyes.
Eyes, and noses. Or little holes in their heads
yes they can yo yo
frilled sharks have huge balls and huge eyes
some sharks have full visability in there eyey so they are esential but other sharks such as the great white and the mako can only see in contrast so they eyes arn't as usefull but still needed
No, great white sharks have excellent eye sight although they do hunt during the day due to the sun getting in their eyes distrupting their vision. This is why most attacks occur at night and early morning
If feel of being threatened. They don't attack without reason . Plus they roll their eyes back for protection so they don't get harmed.
great white sharks roll there real eyes back and when they attack they turn blackThe eyes actually do not roll back, a protective membrane covers them making it look that way.
Well, I could go on and on why sharks are awesome, but I'll just list some of them: 1. Sharks have six sense's, instead of just five like us 2. Some sharks, (Great White's, Mako sharks, etc.) can leap twenty feat out of the water 3. Whale sharks have more than two eyes 4. Sharks where alive before dinosaurs. 5. Some sharks, (like Caribbean Reef sharks) can sleep, they just don't need to close there eyes
Oh, dude, sharks have eyes that are typically around 0.5 to 0.9 inches in diameter, depending on the species. So, like, they're not exactly rocking those big ol' puppy dog eyes, but they're big enough to help them spot their next meal... or maybe just to give you the side-eye if you get too close.
It is not really known whether sharks, including Great Whites, do sleep, but there are several theories. One theory is that sharks do sleep, but with only one cerebral hemisphere at a time, meaning that at least either side of the shark's brain is on the alert constantly. Sharks have been known to lie motionless in a resting state, yet their eyes have followed the movements of divers, so it may be that this inactivity is their form of sleep, rather than full unconsciousness.
Two of the most popular types of sharks in the world are the great white shark and the hammerhead. The great white is well known for being one of the largest and most dangerous sharks to ever exist. The shark in "Jaws" is also a great white, which brought a lot of notoriety to the great whites. Hammerheads are also popular based on their unique head shape which is shaped like a hammer. They have their eyes on the opposing sides of their heads.
Sharks do not sleep