scroll to top
Stuck on your essay?
Get ideas from this essay and see how your work stacks up
Word Count: 2,176
To fully understand colorblindness you must first understand the eye The human eye is one of the most complex parts of the body that is used for seeing Eyes enable people to perform daily tasks and to learn about the world that surrounds them Sight or vision is a fast process that involves continuous interaction between the eye the nervous system and the brain When someone looks at an object what he really sees is the light reflected from the object This reflected light passes through the lens and falls on the retina of the eye Here the light induces nerve impulses that travel through the optic nerve to the brain and then over other nerves to muscles and glands The eye is similar to a television camera Both the eye and the television camera convert light energy to electrical energy The eye converts light to nerve impulses that are interpreted by the brain as the sense perception called sight A television camera converts light to electronic signals that are broadcast and transformed into light images in a television receiver The eye is well protected It lies within a bony socket of the skull The eyelids guard it in front They blink an average of once every six seconds This washes the eye with the salty secretion from the tear or lachrymal glands Each tear gland is about the size and shape of an almond These glands are located behind the upper eyelid at the outer corner of the eye After passing over the eye the liquid from the gland is drained into the nose through the tear duct at the inner corner of the eye Hearty laughter or weeping causes muscles in the upper eyelid to squeeze the lachrymal gland This produces tears that flow too fast to be drained away The eyelashes is the eyes major defence against foreign objects it catches many flying particles that otherwise would enter the
@Kibin is a lifesaver for my essay right now!!
- Sandra Slivka, student @ UC Berkeley
Wow, this is the best essay help I've ever received!
- Camvu Pham, student @ U of M
If I'd known about @Kibin in college, I would have gotten much more sleep
- Jen Soust, alumni @ UCLA