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Anatomy physiology of the eye
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Can You See That? How About Now?
Dakota Lepard
Simpson County Academy
Can You See That?
In the late 1660’s a scientist, Edme Mariotte, discovered the “blind spot’ in the eye. Edme noticed a hole in the eye , the optic disc, with a nerve going through it and found that it was the blind spot. Edme is the first remembers scientist to discover the blind spot. He is often remembered for his study of optics and color perception. Edme made many more discoveries in the science fields. Although Edme did not believe the blind spot was in the retina, he was the first scientist to recognize there was something weird in the eye, at which at some point you could not see an entire image, also known as the blind spot. In the vision field the blind spot is call “Mariotte’s Spot” (Edme Meriotte (1620-1684): Pioneer of Neurophysiology, n.d.). The human eye has a natural blind spot that is completely unavoidable. This spot is where the optic nerve, sending what is being seen, connects to the brain. This nerve passes through the retina causing what is called the “blind spot”. The “blind spot” is a hole being created in the light sensitive tissue. While the image being seen is being sent to the brain it will
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The optic nerve is the cause of the “blind spot”. This blind spot is referred to as an Optic Disc. The optic disc is a hole in the back of the eye that is where the optic nerve exits the eye to go into the brain. This hole, unlike the retina surrounding, is in need of light or contains sensitive photoreceptors. The optic disc is on the nasal side of the eye, about fifteen degrees to the part of the eye that one points towards things when we center in on. Since the optic disc, or blind spot, is located on the nasal side of the eye, the visual side, not containing a blind spot, is in the right side of the right eye and the left side of the left eye (JENNETT, C.,
I'd like to read Ralph Ellison's Invisible Man as the odyssey of one man's search for identity. Try this scenario: the narrator is briefly an academic, then a factory worker, and then a socialist politico. None of these "careers" works out for him. Yet the narrator's time with the so-called Brotherhood, the socialist group that recruits him, comprises a good deal of the novel. The narrator thinks he's found himself through the Brotherhood. He's the next Booker T. Washington and the new voice of his people. The work he's doing will finally garner him acceptance. He's home.
In the movie The Blind Side Michael Oher faced multiple challenges throughout his childhood and his adolescent life. Michaels mom was a drug addict causing her to neglect her children and spend most of her time out of the house looking for money to use on drugs. Michaels father walked out on them when he was born causing him to have a lot less parental support than he would if he had both parents supporting him.
With no treatment needed, glaucoma is a leading cause of blindness in the United States, while simultaneously being the number one leading cause in Africa (Glaucoma Research Foundation). According to the American Optometric Association, “Glaucoma is a group of eye diseases causing optic nerve damage. The optic nerve carries images from the retina, which is the specialized light sensing tissue, to the brain so we can see.” They go on to say that when dealing with glaucoma, one’s eye pressure plays a vital role in damaging the delicate nerve fibers of the optic nerve. “When a significant number of nerve fibers are damaged, blind spots develop in the field of vision. Once nerve damage and visual loss occur, it is permanent.” The National Institute of Health states that due to shallower anterior chamber depths, this defect hurts the lives of people mostly from East Asian descent. The Foundation continues to say that blacks are among the people who are three times more likely to have glaucoma while woman in general are two times more likely to developing angle closure glaucoma.
Coming of age is essential to the theme of many major novels in the literary world. A characters journey through any route to self-discovery outlines a part of the readers own emotional perception of their own self-awareness. This represents a bridge between the book itself and the reader for the stimulating connection amongst the two. It is seen throughout Paradise of the Blind by Duong Thu Huong, Hang’s coming of age represents her development as a woman, her changing process of thinking, and her ability to connect to the reader on a personal level.
The high percentages of individuals who endure this impairment justifies and practically demands future research because the causes are not fully understood. The need for future research can be better emphasized if those with normal vision try to empathize with victims of macular degeneration. One can only imagine how frustrating it must be to receive sensatrions only in the periphery of the retina. Because the macula encompassed the cone rich fovea, which is used to focus on objects, the fovea degenerates as well. This occurence inables individuals to interpret the sensations they experience. Reading, ...
Carver progresses the narrator’s tone throughout the story, from disdainful to cautious to introspective by developing his relationship with Robert, and forcing them to interact with each other, to express that false presumptions about strangers, based on someone else’s experience or stories, can be misleading.
The Portrayal of Blindness in The Outsider and Oedipus the King A primitive motif in Oedipus the King by Sophocles and The Outsider by Albert Camus is blindness. The protagonists in the novels are blinded to a personal truth, and are physically blinded as well. In The Outsider, Meursault’s blindness is metaphorical, as he is negligent to his own absurdity, which he later becomes categorized as. On the other hand, Oedipus’s blindness is literal, as he is ignorant to the truth of his life; and the fact that he is incapable of escaping the destiny that the Gods have set out for him, which resulted in him gorging his eyes out. The characters suffer an emotional and physical blindness, which leads to tragic irony in Oedipus the King and existential irony in The Outsider.
In José Saramongo’s novel Blindness, he states, “I think we are blind, Blind but seeing, Blind people who can see, but do not see.” He explains that people think they can see, but they are truly blind because they are blind to certain ideas or matters that are essential. In Sophocles’ Oedipus Rex, Ian McEwan’s Atonement, and Albert Camus’ The Stranger, characters’ blindness causes them to act irrationally, which often has fatal repercussions.
Yes, there is nothing perfect in the world, including our visual system. Not just having blind spot, but also visual crowding. Although crowding had been classify into a key fact that how people visually recognize objects,(Pelli, D. G. (2008)however, it cannot be avoided nowadays. We can see that human visual system is very complicated system. It still has a very long distance to find out all details of our visual system. To this end, our psychologists and neurobiologist are fighting for their study hardly.
The Element of Blindness: Failure to see clearly alters the perception of an event and limits one’s knowledge of their surroundings. Nothing is what it seems, causing an inconsistency in the truth which leads one to question the vision. Everything then becomes twisted and not what it seems, causing an inconsistency of the truth and leading one to doubt their vision. This scenario can be compared to the recurring theme in Ralph Ellison’s, The Invisible Man. Throughout the novel, nothing is ever quite as it seems to the narrator as he struggles to understand the truth about society and ultimately himself.
In her essay “Seeing”, Annie Dillard focuses on showing how different people have different perceptions. Dillard gives multiple examples to support her main idea, which is that preconceived and inherited notions influence our perceptions. Dillard discusses the different ways of seeing, how people with different backgrounds have different experiences with seeing, and many more. While Dillard’s idea about perceptions is definitely relevant and accurate, but are certainly not complete as there are multiple things that influence our perceptions.
Michael Oher was from an all-black neighborhood located in the third poorest zip code in the country. By the time he was a sophomore, he’d been to 11 different schools, he couldn’t read or write, and he had a GPA of 0.6. In his first-grade year alone, he missed 41 days of school and ended up repeating both the first and the second grade; he didn’t even go to the third grade. Oher was one of the thousands of children that have been identified as having four or more of the at-risk factors mentioned by the National Center of Education and Statistics (NCES). According to the NCES, poverty and race are high on the list of things that negatively affect students’ ability to succeed at school. Other risk factors include changing schools multiple times and being held back from one or more grades. Oher’s biography, The Blind Side by Michael Lewis, proves how socioeconomic status impacts a child’s academic success because placed in perspective, education is not as important as the hardships of reality.
Open-angle glaucoma - With this form of glaucoma, the loss of vision occurs so gradually it is rarely noticed. However, as eye damage increases, you will eventually find that you have lost a lot of areas of your peripheral vision, especially the field of vision near your nose. As larger areas of your peripheral vision fade, you may develop tunnel vision -- vision that has narrowed so you see only what is directly in front of you. If glaucoma is not treated, even this narrowed vision disappears into blindness. Once gone, areas of lost vision canno...
Laila confirms that her friends have ordered pizza using her visual system. Through the sensation of light, sensory information is processed and Laila is then able to see the pizza. The pupil absorbs light, by allowing light to enter the eye, and light will then be transferred to the lens. The lens is responsible for refracting light and focusing the light inside of the eye, also known as the retina. The second cranial nerve, or optic nerve, is responsible for carrying the visual signal from the eye to the optic chiasm. The optic nerve, or second cranial nerve, is located in the back of the eye. This cranial nerve transfers visual information to visual centers in the brain through many electric impulses. The optic chiasm has temporal fibers that travel ipsilaterally as nasal fibers transmit information contralaterally, to the opposite side of the associated visual field. The visual cortex can then process sensory information from the opposite eye. Laila’s blind spot is where the optic nerve begins and there are no rod or cone cells in the optic nerve. The brain has to try to compensate for the lack of photosensitive
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...