Human Eye Essay

556 Words2 Pages

The human eye is an organ that allows a person to see, the sense of sight. The eye is composed of several parts including the cornea, lens, pupil, retina, optic nerve etc. There are two portions the eye is broken into, the front third is the anterior segment and the other two thirds is the posterior segment. The anterior segment includes the lens, cornea, iris, and ciliary body. The posterior segment of the eye essentially is the back portion of the eye. In detail, the posterior segment is the portion of the eye behind the lens that includes the retina, macula, optic nerve, choroid, and vitreous humor. There are many diseases that affect the eye and those in particular affecting the posterior segment will be discussed in detail.
Some diseases that affect the retina and posterior segment of the eye include diabetic retinopathy, retinal cancer (melanoma), glaucoma, age macular degeneration, and uveitis. Diabetic retinopathy and glaucoma fall under diabetic eye disease. Diabetic retinopathy is the most common diabetic eye disease. It is the damage to the blood vessels in the retina. Gl...

Show More
Related

  • Unilateral Acute Multifocal Posterior Placoid Pigment Epitheliopathy with Papillitis

    1405 Words  | 3 Pages

    The widespread involvement of Retinal Pigment Epithelium (RPE), flat (placoid) nature of the lesions and absence of overlying serous retinal detachment and minimal choroidal involvement lead Gass to conclude RPE was primary focus of inflammation.(1) ...

    Read More

  • Retinitis Pigmentosa Research Paper

    1165 Words  | 3 Pages

    Retinitis pigmentosa is caused by damage to the retina of the eye. The retina is the light sensitive layer of tissue at the back of the eye. The retina focuses images in the brain and then sends them via electrical signals up to the brain. The retina is a very important part of the eye to help a person see. What is affected in the retina from this disorder are the rods in the eye. The rods allow a person to see in the dark. Retinitis pigmentosa slowly causes the rods in the eye to deteriorate over time. Retinitis pigmentosa also can cause the cones in people’s eyes to deteriorate. If a person’s cones deteriorate first, then the person first develops blindness in the center of their eye and they lose some of their color vision. This form of retinitis pigmentosa is much rarer than the form that deteriorates the rods in the eyes.

    Read More

  • The Subordination of the Camera Eye to the Human Subject

    2896 Words  | 6 Pages

    The Subordination of the Camera Eye to the Human Subject 2 Film, as a medium of sight, exists primarily as a mode of representation. By the recording of images, a perspective of reality is created and maintained during viewing. The relation between what the camera records and what the viewer perceives is a direct one, which is sustained through the material assumption of the filmic reality as an actual one (The suspension of belief). Citing examples from Psycho (Alfred Hitchcock, 1960), 2001: A Space Odyssey (Stanley Kubrick, 1968), Man With a Movie Camera (Dziga Vertov, 1929), and Blow Up (Michelangelo Antonioni, 1966) this paper will contend that these films assert the prevailing domination of the human viewpoint over that of the “cineeye.”

    Read More

  • Eyes In The Great Gatsby Essay

    1204 Words  | 3 Pages

    Eyes are the window to the soul. Eyes are used to see but what happens when one looks through another individual’s eyes? F. Scott Fitzgerald used this idea in The Great Gatsby, Owl Eyes symbolizes an omniscient point of view who is all seeing revealing characterization and a theme. When Fitzgerald first introduces Owl Eyes he is at the party that Gatsby holds. He is in the library fascinated with the books being real and containing actual paper. The significance of him being in this specific setting is he is wise, he is an all knowing figure that Fitzgerald introduces to the audience very early in the book. The owl in his description symbolizes that he is wise and educated. His setting, the library, represents how knowledgeable he is. The eyes

    Read More

  • Human Vision and the Eye

    574 Words  | 2 Pages

    Human eyes receive and form images from outside, also automatically changes in light and seeing things close up and at a distance. Therefore, we can see most of things from outside world. But without light, we can't see anything. Light travels though space and the sun gives off light rays then enter the eyes they are bent or refracted and these light rays create images or picture of all the objects around you, that's why we can see things very clearly. How light enter the eye, first light enters the eye though pupil which control different amounts of light into our eye. Then crystalline lens helps us see clearly, when we look at near objects crystalline lens will grows thicker and when we look at far objects then it will grows flatter. The crystalline lens and the cornea (the window of the eye) are bending light rays and sending them to the retinain the right direction. For our perfect vision, light rays must focus at one point on the retina.

    Read More

  • Color

    1377 Words  | 3 Pages

    The eye consists of many parts. The part of the eye you can see when you look at someone consists of four parts. The colored part of the eye where the light enters is called the iris. The white part around the iris is the conjunctiva and episclera. This part also contains blood vessels. The cornea is the clear covering of the iris and pupil. The cornea contains no blood vessels. The lens is located behind the iris. The lens is used to focus, as in the cornea, but the lens can move. The retina is responsible for telling the brain what a person is seeing. They determine all the different parts of what is being seen. It then codes them to electrical signals for the brain (Cassel p 4-10).

    Read More

  • Mathematics of Human Vision and Corrective Lenses

    1683 Words  | 4 Pages

    The four main components of the eye that are responsible for producing an image are the cornea, lens, ciliary muscles and retina. Incoming light rays first encounter the cornea. The bulging shape of the cornea causes it to refract light similar to a convex lens. Because of the great difference in optical density between the air and the corneal material and because of the shape of the cornea, most of the refraction to incoming light rays takes place here. Light rays then pass through the pupil, and then onto the lens. A small amount of additional refraction takes place here as the light rays are "fine tuned" so that they focus on the retina.

    Read More

  • Macular Degeneration Research Paper

    406 Words  | 1 Pages

    Macular Degeneration is a genetic disorder that affects the eyes and vision. It impacts the light-sensing cells, which makes it difficult to read, drive, and recognize faces. The vision at night is most likely not going to be impacted as well as the peripheral vision. There are two different types of macular degeneration is wet and dry. Dry is more common and is said to affect 85 to 90 percent of people with macular degeneration, it causes a build up of yellow deposits. It mostly infects most eyes but one eye will tend to degenerate sooner. Macular degeneration mostly affects the elderly (50 to 60 years old), but juvenile can affect people younger.

    Read More

  • Overview of Coloboma

    1752 Words  | 4 Pages

    The middle layer of the eye includes the iris, the ciliary body, the lens and the choroid. The iris gives a person’s distinct eye colour, controls the size of the pupil and hence the amount of light entering the eye. It separates the anterior and posterior chambers in the front part of the eye. These chambers contain the aqueous humour, which is important in nourishing the lens and cornea. The lens is a shear, flexible structure, which changes its shape and hence participate in focusing one’s vision on close or distant objects. The vitreous humor is a jelly-like substance that fills the back portion of the eye. It has a structural function and is involved in maintaining the eye’s shape, but also helps transmitting the light to the retina. The choroid is a membrane found between the sclera and the retina. It lines the back of the eye and is rich in blood vessels. It is highly pigmented in order to absorb light and prevent scattering.

    Read More

  • Cultural Eye Example

    347 Words  | 1 Pages

    Analyzing Your Cultural Eye has been a move I frequently use this semester. Conversing with my daughter in law, Ashleigh about Black Lives Matter is one example. Ashleigh’s father is a cop, in California and my son is a black teenager with a driver’s license. Because of our backgrounds and experiences, we view the Black Lives Movement from complete opposite ends of the spectrum. When speaking with Ashleigh or communicating via social media, which can be taken out of context anyway, I am trying to be more cognizant of why she feels the way she does and am trying to give her things to think about in a way that doesn’t elevate one position over the other.

    Read More

  • Glaucoma

    999 Words  | 2 Pages

    Fluid circulating inside the front portion of the eye is produced by a structure called the ciliary body, which is located behind the iris. This fluid moves through the opening of the pupil, passes into the space between the iris and the cornea, and drains out of the eye through a tissue called the angle. With glaucoma, the passing of fluid through the angle is either reduced or suddenly stops, and amounts of fluid inside the eye increase. This high fluid pressure hurts the nerve fibers and the eye's optic nerve and causes blind spots. It may lead to blindness in some cases.

    Read More

  • Structure of the eye and ear

    952 Words  | 2 Pages

    parts to it; the choroids, ciliary body, and the iris. The choroids is what provides

    Read More

  • Eye Evolution Essay

    2260 Words  | 5 Pages

    An inspection of the modern animal phyla will reveal that eyes are just as diverse as they are complex. Some organisms like the rag worm have pigmented cup eyes while other like he box jellyfish have two lens eyes and two pairs of pigment pit eyes. To account for the diversity in eye structure, we must first examine the eye ‘prototype’, the original structure that was acted upon by evolution. The simplest organ that can be considered an eye is composed of a single photoreceptor cell and a single pigment cell, without any lens or other refractive body (Arendt, 2003). Such organs are know as eyespots, and...

    Read More

  • Macular Degeneration

    1727 Words  | 4 Pages

    Macular degeneration in general can affect many people in minor or drastic ways. People who experience this form often complain of vision loss when they are in dim light, especially when they are reading. The "dry" type is often characterized by a more gradual loss of vision compared to the "wet" type. Signs of this disease include an increase in drusen, which is an accumulation of a yellow-white substance, in the underside of the macular retina. A loss of cells can be seen in the macula. The macula is our sensitive sight region, where intricate detail can be seen. Thus, vision in this area is helpful and necessary to drive, read, focus on small details, and recognize familiar faces. The macula is located in the back of the eye known as the retina. The macula is only about 5 mm in diameter, and includes the fovea, which gives us our detailed central vision. If a person suffers from the "dry" form in one eye they will be more likely to develop it in the other eye as well.

    Read More

  • The Human Eye

    2031 Words  | 5 Pages

    As further protection, the eyelids automatically close when an object suddenly moves close to the eye.Parts Of the EyeThe eye is made of 3 coats, or tunics. The outermost coat consists of the cornea and the sclera. The middle coat contains the main blood supply to the eye and consists of the choroid, the ciliary body, and the Iris. The innermost layer is the retina.Cornea and ScleraThe Sclera, or the white of the eye, is composed of tough fibrous tissue. On the exposed area of the eye the scleral surface is covered with a mucous membrane called the conjunctiva.

    Read More

More about Human Eye Essay

Open Document