Anatomy Of The Eye : Anatomy Essay

Explain the visual process, including the stimulus input, the structure of the eye, and the transduction of light energy.

After being shown a picture of an elephant they eye will take the light that is reflected from the object and it will enter the eye through the pupil. Then the light will be focused by the cornea and the lens to form a sharp image of the elephant in the retina. The retina is the network of neurons that cover the back of the eye and contains the visual receptors for a person vision. The visual receptors are made up of cones and rods that contain light sensitive chemicals called visual pigments. Visual pigments reacht to light and cause a triggered electrical signals to occur. These electrical signals will then flow through a network of neurons and this network of neurons is what makes up a persons retina. After the flow through the network of neurons occurs the electrical signals will emerge from the back of the eye in the area

Focusing an image clearly onto the retina is the initial step in the process of vision, but although a sharp image on the retina is essential for clear vision, a person does not see the picture on the retina. Vision occurs not in the retina, but in the brain. Before the brain can create vision, the light on the retina must activate the visual receptors in the retina by a two-element

Eye Vision Inc, a long-standing medical device manufacturer, has signed a contract to sell Holland Hospital the Clear View Laser and a two-year separately priced maintenance plan for $1 million and $0.2 million respectively. On a when-and-if available bais, Eye Vision Inc. will provide software updats that is embedded with the Laser to maintainance purchasor. The software has never been sold without Laser for its functional necessity. In this memo, as explained below, we conclude that:

When it comes to vision, we see things based on the light reflected from surfaces. The reflected light waves enter the eye through the cornea at the front of the eye, it's resized at the pupil, focused by the lens, and hits the retina at the back. The light is then detected by rods and cones, photoreceptors, which alters the light into electrical signals. The optic nerve transmits those vision signals to the lateral geniculate nucleus, where visual information is transmitted to the visual cortex of the brain then converts into the objects that we see.

“I used to worry that computers would become so powerful and sophisticated as to take the place of the human minds,” expresses Lewis Thomas, the author of “The Corner of the Eye” [Thomas, 83]. A large part of Thomas’s fear of computers is due to the fact that “a large enough machine can do all sorts of intelligent things beyond our capacities” [Thomas, 83]. However, computers cannot replace us; he realizes computers cannot do some of the things that we can do, like being human. We like to be equivocal, imaginative, and self-conscious. Computers are the complete opposite of the traits that define us as human; or as Thomas states it, “they are not designed, as we are, for ambiguity” [Thomas, 83]. As witnessed by history, the present, and soon the future, it would be self-evident truth that computers will not take over us or be “us”.

The idea that a singular organ could advance human beings to the pinnacle of the animal kingdom is mind blowing. Furthermore, the more I learn about the anatomy of the eye, the more I appreciate how sophisticated our sense of vision truly is. In addition to being fascinated by the eye, I am also highly fascinated with how biology works; especially on the microscopic scale. Biochemical molecules and the workings of the fundamental units of our universe intrigue me since they are functioning in and around you as you are learning about them. I believe my fascination with the fundamental units of our universe, coupled with my fascination of the eye will allow me to do very well in the vision and biomedical courses that optometry school focuses

Humans have a unique and wonderful device in how one sees. The eye and brain work together to turn the world into visual data one’s brain can understand and use. There are some eye conditions that inhibit the sight or the recognition of the shapes one sees. Research continues to overcome these conditions as well as to further understand the biochemical reaction that gives humans the sight and understanding one has of visual data. Included in the paper are some of the latest research methods.

The eyeball holds many parts to allow eyesight. The retina holds the key to allowing the human eye to see color. The pupil appears as the black part of the eye that people see, the pupil however does not have much to do with comprehending color. As Clarence Rainwater said in his book “The pupil is simply the hole in the iris through which light enters the eye.” (84) The light then has to pass through many parts of the eye before reaching the retina such as the transparent cornea, the aqueous humor, the lens, and the vitreous humor. Clarence Rainwater described the retina as “... the eye’s sensitive inner surface.” (86) The exciting part of the eye starts here. The retina holds the key as stated by Clarence Rainwater, “... a complex system

The development of the human body is an exquisite process that involves numerous complicated processes for even the smallest of body parts, including the eyes. The eyes are an extraordinarily complex organ capable of gathering information through refracted light and sending it the brain to assemble a picture. They provide the ability to see and follow a moving object and the capability to tell an approximate distance of an object. When light passes through the cornea and iris pupil, at the anterior portion of the eye, it is focused by the lens onto the retina at the back of the eye. Photoreceptor cells, which are present in the retina, detect the light and send information to interneurons which begin to sort out the information. This information is then sent to ganglion cells which transmits the final information to the brain (Sowden 199). Because the eyes have such complicated and exquisite processes, the likelihood of developmental errors occurring are possible. A large number of these developmental errors lead to congenital defects and abnormalities that effect the individual’s eye sight. Some of these defects and abnormalities can cause serious diseases and syndromes that effect more than just the eyes, but also neurological processes, facial dimorphisms, growth failure, tracheal development, and genitalia anomalies.

Light must pass through the cornea, aqueous humor, lens and vitreous humor before reaching the retina. It must then pass through the inner layers of the retina to reach the photoreceptive layer of rods and cones.

The visual system of the cells within the brain contain an area known as the receptive field and is the point in which light enters hits the cell of a receptor (Kalat, 2013). This part of the visual system relies on sensory information, such as light, to either excite or inhibit the cells within the center portion of the receptive field. One of the most significant processes of transmitting information from the visual field is through primary cells of the visual receptors, which include the retinal ganglion cells. In the retina, ganglion cell send information from the eye to the brain. Both the rods and cones within the visual system have a rather small receptive field that connects to bipolar or amacrine cells, of which have their own receptive field consisting of ganglion cells, and then the ganglion cells ultimately make up a larger receptive field (Kalat, 2013).

The most effected part of the eye is the optic nerve. The optic nerve's main purpose is to connect the retina and the brain, as to send what the human is seeing to the brain to process the visual information. The optic nerve contains more than one billion nerve fibers which each give off their own electrical impulses to send the visual information to the occipital lobes in the brain. The occipital lobe then processes the information which it receives.

She will be able to visualize due to primary visual cortex and surrounding areas. V1 & V2 being responsible for orientation, spatial frequency, and color
V3 for integration of information, V4 for object recognition, color perception
V5/MT for motion perception. Cranial nerve II, the optic nerve, is a sensory nerve delivers images of sight to the brain and runs to the visual cortex in the occipital lobe .This nerve is activated when Laila sees her friends around a margarita pizza. The visual information is initially processed from her eyes. Her pupils absorbed light, which enters the eye and then travels to the lens. The lens refracts the light and focuses the light into the retina. The optic nerve (II), is responsible for carrying the visual impulse from the eye to the optic chiasm. This nerve is located in the posterior of the eye. It transfers visual information to the visual centers in the brain. The optic chiasm contains temporal fibers that run

The optic nerve reaches from behind the eyes to the occipital lobe where this visual information can finally be interpreted into what we know as ‘seeing something’. It is at this point that it is useful as this is when colours can be perceived (Breedlove, 2010).