Question: who has better vision a hawk or eagle

title: Eagle eye
text: Eagles blink up as their top eyelid is larger than the bottom one ; the additional inner eyelid is known as a nictitating membrane , which `` grows in the inner corner of the eye , next to the tear duct '' . Eagle tears moisten the eyes and contain the chemical lysozyme which protects against salt water and also destroys bacteria , thus preventing eye infections . The nictitating membrane acts a sweeping wiper across the eye . The eagle iris is a pale yellow colour , much lighter than human eyes . Both eagles and humans have a white area called the sclera , but in the case of eagles , it is hidden below the eyelid . Eyelid openings are oval - shaped in humans , while they are round in the case of birds ' eyes .