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Human Eye Essay

How the Eye Creates Vision Essay examples

906 Words4 Pages

Sight is one of the most important senses because it allows us to gain knowledge about the wold. Without vision our ability to know what your surroundings are is limited. In this essay I will explain the complex structure of the eye, how it works, the properties of vision, and how heterchromia iridis effects the eye. From this essay the reader will be be able to understand the working of the eye and have a foundation for more advanced knowledge.

The eye has an intricate structure that consists of many parts. The sclera, or whites of the eye works to keep in the inside of the eye dark and also to providing the "casing of the eye." Posterior to the sclera is the cornea which is to protect the eye. In addition it also helps the lens…show more content…

Sight is one of the most important senses because it allows us to gain knowledge about the wold. Without vision our ability to know what your surroundings are is limited. In this essay I will explain the complex structure of the eye, how it works, the properties of vision, and how heterchromia iridis effects the eye. From this essay the reader will be be able to understand the working of the eye and have a foundation for more advanced knowledge.

The eye has an intricate structure that consists of many parts. The sclera, or whites of the eye works to keep in the inside of the eye dark and also to providing the "casing of the eye." Posterior to the sclera is the cornea which is to protect the eye. In addition it also helps the lens in its function to focus light. Behind the cornea is the Aqueous humor which is a watery gel that fills the empty space between the cornea and iris. The pupil is the opening of the eye that lets light through while the iris, the colored part of the eye, controls how much light is allowed through the pupil. Posterior to the iris, there is the lens, which serves to project the image of the outside world on the retina. The retina acts as the "screen" of the eye and is located on the back near the optic nerve. It "feels" the light, then sends the image to the brain, via optic nerve. The optic nerve is the nerve that sends the image to brain. In front of the retina is the vitreous humor the jelly-like substance that fills the empty space of the

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Physics of the Human Eye Essay

2076 Words9 Pages

Physics of the human eye.

The human eye, what a complex but fascinating organ. It has the ability to see past the horizon and observe the different colors of a rainbow. The eye can be quicker then a race car but slow enough to witness a snail crawling across a beach. The eye can capture objects at various different angles, such as birds flying overhead or a person walking right beside you. Yes indeed, the eye is probably the greatest sense a person can have.
The eye is so vast and complex. To try and write everything about the eye would take a very long time. Compiling all the information and then putting it down on paper, a person could write another book. The eyeball it self weighs about 7gm., the volume 6.5cc., and its specific…show more content…

(Fig 1.) Normally when we see an image, it is because light passes through the cornea, pupil and lens. Both the cornea and lens work in conjunction to focus the image on the retina. The lens is actual flexible so that it may become flatter or more rounded, so that is able to focus the image on the retina. In normal healthy eyes, the light that passes through the eye and that is focused on the retina. This light has the right focal point. This means that the eye converges parallel light rays from distant objects to a point that is focused on the retina. (6) This focal point is located directly in the back of the eyeball on which the image is formed. (1) (Fig. 2)
When light enters the eye, the lens forms an image that is inverted (similar to a camera). This means that the retinas in our eyes interpret the image as being right side up by our eye-brain system.
Fig. 1 Fig. 2
(Eye anatomy) (Normal eye)

If an individual was experiencing any loss in vision, it would be a good idea to test your vision. A eye chart (see fig 3. Pg.3) could be placed in a well illuminated area and the person would stand about 6 meters from the chart. The lowest line that you can read correctly is you visual acuity. If the chart printed is the correct size, the calibrated line should measure 100mm. If so, the calibration should be multiplied by 2.26. An example, the calibration line is 100 mm, 100 * 2.36 = 236 inches, or 19 feet, 8 inches (which is about 20

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