Vision
One of the special sense organs is the eye. The main structures of the eye are the sclera, choroid, and the retina. The sclera is known to protect the outer layer of the eye, the sclera have six tiny muscles that connect to it to help control the eye movement. The main function of the choroid is to prevent the scattering of light via the pigmented vascular layer. The choroid is divided into four parts: the haller’s layer, sattler’s layer, choriocapillaris and brunch’s membrane. The iris and cornea make up the front part of the choroid and the center of the iris is pupil of the eye. The retina is the innermost layer of the eyeball. The main function of the retina is to detect light per the photoreceptor cells. These photoreceptor cells are microscopic and are called cones and rods due to their shape.
A condition of the eye is called presbyopia. Presbyopia is a condition of the eye that may develop as we get older which causes the inability to focus on objects that are close to us. Presbyopia is also known as old-sightedness. Hence, age does affect the eye sense organ. Another...
Although Hurston's novel Their Eyes Were Watching God is a widely read novel today, that wasn't always the case. When her novel was first published, many black readers were enraged. It wasn't until the early seventies when Hurston's novel was rediscovered. What aspects of the novel enraged the readers so that it would be forgotten for more than thirty years?
Acquired prosopagnosia refers to when the onset of prosopagnosic symptoms occur after brain trauma, resulting in damage to the cortex of the brain from hitting the inside of the skull (Bodamer, 1947). It can also refer to the initiation of symptoms after brain tissue dies (ischemia) such as from loss of blood supply like from a stroke, or a neurodegenerative disease (Villa et al., 2013, pg. 375).
The structures of the monkey eye retina include adipose, sclera, ciliary body, pigment epithelium, photoreceptor layer, cell bodies of rods and cones, outer plexiform layer, inner nuclear layer, inner plexiform layer, ganglion cell layer, optic nerve fibers, inner limiting membrane, and the vitreous body.
The further psychological deconstruction and rejection of the African American as an entity through racism results in characters such as Geraldine. The character of Geraldine in the novel serves several purposes that furthermore demonstrates and promotes another level of racism in humanity. The first purpose of Geraldine’s character is to present a character who has achieved a certain level of superiority and this gives her acceptance above other African Americans of the community that deems her certain privileges gained through her light skin. Geraldine presents the perfect picture of a successful African American woman who is able to separate herself from the “lesser” blacks in the community. However, in the process she has developed an obsession
Have you ever wondered how exactly you got your eye color? It starts with eye color genetics. Eye color genetics are the DNA (deoxyribonucleic acid) make-up behind your eye color. Your eye color has a huge effect on how you perceive the world. Without eye color, you wouldn’t be able to decipher colors. Eye color genetics are important to the very culmination of your being.
In the passage from the opening of “The Pupil” by Henry James, the author’s portrayal of the three characters, Mrs. Moreen, Pemberton, and Morgan Moreen, and the odd relationships between them set the mood of the story. James’ satirical tone, indirect characterization, and third-person limited point of view depict these relationships as one where all are involved somehow to manipulate and use each other.
The five senses include sight, smell, touch, taste, and hearing. Sight is the power of seeing objects and people. To see we use our eyes, our eye is a sphere with a diameter of about 2.5 cm or 1 inch. Our eyes include the eyebrows, eyelids, conjunctiva, lacrimal apparatus, and extrinsic eye muscles. The eyelids are thin, skin covered folds supported by the connective tissue sheets called tarsal plates and are separated by the palpebral fissure and meet at medial and lateral angles of the eye. The eyelid muscle cause blinking every 3-7 seconds and when the objects get in your eye, the flexibility is activated to protect the eye. The eyelashes also protect the eye. Anything that touches the eyelashes is blown away because it will cause your eye to blink. The conjunctiva in our eyes is a mucous membrane; it helps to line the eyelids. The function of the conjunctiva is to produce a lubricating mucus that prevents the eyes from drying out. A conjunctival sac is where contact lens lies and occurs when the eyes are closed and a slit like space occurs. An inflammation of the conjunctiva is called conjunctivitis and happens when the eye get red and really irritated. The lacrimal apparatus in our eyes drains the lacrimal secretions into the nasal cavity. The lacrimal fluid in the eye cleans and protects eye as it moistens. The fluid contains mucous, antibodies, and lysosome. The extrinsic eye muscles originate and insert into outer surface of the eyeball. The extrinsic eye muscles allow the eye to follow a moving object and provide wires to maintain shape of eyeball and hold it in orbit. When movements of these muscles are not the same, a person cannot focus on images correctly and see two images instead. The eye is called an eyeball and ha...
Affluence versus poor, an age-old battle, especially during the “two worlds” time period of Victorian England. In Henry James’s The Pupil, this battle is brought to life as a poor young man, Pemberton, attempts to negotiate a salary as an in-house tutor for a very wealthy family, the Moreens. Through the use of diction and detail, James creates a specific tone that surrounds each character. Taken together, these various tones create a central tone of mockery and ridicule of the relationships amongst the characters. Additionally, James tells this story through the perspective of an omniscient narrator, that focuses mostly on the perspective of Pemberton, with a few shifts to a more neutral position. This perspective facilitates
My interest into becoming an optometrist had begun when I was in high school; it happened in an unconventional way. It was not through watching videos, or someone explaining to me what optometry was, but rather, seeing the power of it firsthand. There was a point in my life where I felt emotions that I was unable to comprehend at the time. Seeing a family member on an operating table was the most petrifying moment that I have gone through, especially when the person on the table was my father. My father had to get a chalazion removed from his right eyelid. The doctor told my family that my father would be susceptible to certain health risks because of his diabetes and the severity of his cyst. This procedure was the hardest thing I have had to deal with in my life because it made me feel helpless. Usually, when my dad needs help he always asks me, but this time I could not do anything. It is interesting to think that something so small had such a big affect on my life.
Sight helps us navigate the world around us more than any of our other senses. In a fraction of a second, our eyes work with our brains to tell us the size, shape, and texture of an object. They also tell us how close it is and if it’s still or moving. The structures of our eyes are incredibly complex, despite how small they are compared to the rest of our organs. The human eyes are extremely delicate. The visible part of the eye is protected by the eyelids and eyelashes, which keep out dirt, dust, and harmful bright light.
parts to it; the choroids, ciliary body, and the iris. The choroids is what provides
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...
Vision is a physical sense that uses light to provide information to the brain in order to make conclusions about the surroundings. The human eye is an intricate organ that works best when there is an adequate supply of light. Our eyes have been often compared to cameras in that a camera filters light through the lens, controls the intensity with an aperture and focuses the image onto a film. Light coming into an eye is filtered through the cornea, the iris regulates how much light comes through, and then it is focused by the lens onto the retina.
One sub-system under the sensory system is the visual system; the main sense organs of this are the eyes. The eye is the sensory organ that allows us to detect light from external stimuli. When a light ray is detected, the eye converts these rays into electrical signals that can be sent to the brain in order to process the information and giv...
The Eye is the organ of sight. Eyes enable people to perform daily tasks and to learn about the world that surrounds them. Sight, or vision, is a rapidly occurring process that involves continuous interaction between the eye, the nervous system, and the brain. When someone looks at an object, what he/she is really seeing is the light that the object reflects, or gives off.