Here, we are going over everything you can physically see when you look at the eagle's eye. The first thing that should attract our attention is the yellow sclera. When you first look at the eye, you might think that the iris is yellow, when actaully it's the iris AND sclera that are yellow. The color is yellow because it affects the way

 they see things. The eagle eye is convex, which means it's curving outward or extending out. Next

is the pupil: Our pupil and the eagle's pupil both have the same job. Both control how much light

enters your eye, onto the retina. Also they are similar in a different way. They have the same

reaction when exposed to the different levels of light. As you can see in the diagram on the side,

they have three different reactions. The first is when they are exposed to a little light, or none at all. 

When that happens, the muscles of the iris contract and the pupil becomes larger. The other

reaction is when the eye is exposed to medium light, the muscles relax and the pupil is the

medium, average sized. In bright light, the muscles of the iris contract and the pupil becomes

smaller. 

Everyone cries. Everyone will have tears pouring down their faces when they're sad. The tears

come from tear glands. They are always, constantly making tears, even when you're not sad. For

eagles, it's a different story. Eagles, and some other birds, have different glands that gave off, not

only watery tears, but also oily tears. Those tears protect their eyes from the salt water. 

 Imagine this: you remove the skin from around your eyes, how do you think your eyes would

look after that? Well, here's your answer: Your eye would look much bigger and more round

from the front. It would look very freaky and scary. Thankfully, the eyelid opening for a human

is oval-shaped and the eagle's eye is round and circular. Eagles actually have 3 eyelids. We can actaully see two

of them, but the third one is a nictitating membrane. A nictitating membrane is a clear, extra level of protection for the eye.