When biting prey, some sharks protect their eyes with a third eyelid called the nictitating membrane. A shark is the only fish that can blink with both eyes. There are two blind spots;one directly in front of the shark’s snout and one directly behind the head. It appears that sharks "blink," because they have what is called a "nictating membrane" that they close to protect their eyes against damage or debris getting into their eyes when going after prey. ... Not as far as I'm aware, neither sharks nor fish blink that's why they sleep with their eyes open. This is a voluntary action. 0 1. Interesting animal trivia Photogallery. IT'S NOT A FAST SWIMMER. They have upper and lower eyelids, but these lids don't move and don't close over the eye. Looking for Mania in the Eyes. Sharks don't blink. No. Sharks have eyelids, but they do not blink because the surrounding water cleans their eyes. Many sharks can contract and dilate their pupils, like humans, something no teleost fish can do. And just as an addition - they can't stop moving either. Many sharks don’t blink, they just use their eyelids when they need protection and rarely close their eyes. It has special eyelids to protect it's eyes from sharp seal talons. Because the shark’s eyes are on opposite sides of its head (in most species), the shark is able to see for almost 360-degrees. Between the reach of its jaw and the capacity of its maw, the shark can fully engulf seemingly-out-of-reach prey in the blink of an eye. Shark or fish don't blink in the way that we are used to .They have upper and lower eyelids ,but these lids don't move and close over the eyeHope this will hel… When biting prey, some sharks protect their eyes with a third eyelid called the nictitating membrane. Most sharks have a membrane inside their eye socket-they cannot shut it by choice, but when they go into feed, it automatically closes, protecting their soft eyes. The definition of blink is, "to open and close the eye, especially involuntarily; to wink rapidly and repeatedly. Some don’t even have eyelids, instead species like the great white roll their eyes into their head when they need protection, usually when feeding. A shark is the only fish that can blink with both eyes. (Photo: Instagram) Interesting animal trivia Photogallery at ETimes General consensus is that the shark (most -- not all types) is the only fish that blinks, however: Sharks don't blink in the way that we are used to. After a few years of research with myself and others with mania, I determined that mania can affect the entire eye, from the distance between the brow and eye … Darth NANAME: The nictitating membrane (from Latin nictare, to blink) is a transparent or translucent third eyelid present in some animals that can be drawn across the eye from the medial canthus for protection and to moisten it while maintaining vision. 8. Some reptiles, birds, and sharks have full nictitating membranes; in many mammals, a small, vestigial portion of the membrane remains in the corner of the eye. They have upper and lower eyelids, but these lids don't move and don't close over the eye. To protect their eyes some species have nictitating membranes. The shark is not blinking. This membrane covers the eyes while hunting and when the shark is being attacked.