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The External And Internal Structure Of The Human Eyeball

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The human eye is a very unique structure. The main purpose of the human eye is to “not only let you view the scenes and phenomenon in your surroundings, but also it enables you to differentiate between colors” (“Most Read Articles.”). There are many structures in the eye that make it work the way it does. The human eyeball itself is similar to many animal eyeballs like the cow eye that we dissected but there are some structures that are different. This paper is going to talk about the external and internal structures and how the cow eye differs from the human eye. The outermost external eyeball structures are the eyelids and eyelashes. These two structures have different jobs in protecting the eyeball. The eyelids cover and protect the cornea and conjunctiva from chemical or physical activity (“The External Structure.”). There are two different kind of activities that the eyelid does to protect the eyes. The activities are squinting and blinking. Squinting shields the eye from excessive light, that can damage the internal structure such as the retina and blinking spreads tears across and and removes irritants from the cornea and conjunctiva (“The External Structure.”). The eyelashes also protect the eye. They are “short, stiff hairs that shield the eye from irritants such as dust” (“The External Structure.”).
The innermost external eyeball structures are the sclera, conjunctiva, cornea, tear gland, iris and pupil. These are the parts of the eye that you can see. The sclera

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