The Eye And Laser Eye Surgery Essay -- essays research papers

A Functioning Eye (Emmetropia) The eye is the organ of sight. It is used in almost everything we do, from playing sport to reading. A normal and well functioning eye can focus objects and images, both near and far, perceive depth and adapt to changes in light. The perception of depth is due to having two separate eyes creating two separate images, while the ability to adapt to light change is attributed to the iris and the dilator muscles. However these two aspects of the eye are not involved in laser eye surgery and will not be discussed in reference. The focusing of objects and images is very much part of laser eye surgery. In order for a clear visual image to be formed the image must come to a point on the retina. Light rays do not normally travel toward each other, usually the light rays either travel outwards or almost parallel, for this reason the light rays must be refracted. The cornea is the primary place of refraction, the â€Å"bent† light rays then travel through the aqueous humor and the pupil to the lens. Here the light is one again refracted even closer together, the light then goes through the vitreous humor and is projected onto the retina. The focus of the lens should be aimed at the fovea centralis (a tiny pit in the middle of the macula). It is in this region that vision is most sharp. For this reason, instead of simply staring at one point the eye must constantly â€Å"scan† the area to focus the whole object or image. In order to accommodate the changing distances of the object or image the lens in the eye has to adjust, becoming thinner to focus distant objects and fatter to focus near by objects. This process, of changing the lens thickness is known as accommodation. In order for this to occur the ciliary muscles contract and relax. The contraction fattens the lens and the relaxation stretches the lens. The eye functions on much the same principle as a camera. The iris, or coloured portion of the eye, acts as a shutter to regulate the amount of light admitted to the eye. The cornea (the clear window at the front of the eye) and the lens (located behind the pupil) serve to focus light rays from the object viewed onto the retina at the back of the eye. The retina then transmits the "picture" of the object viewed to the brain where the object is "seen". Clear vision is the result of light rays passing through the cornea,... ...ubstantially reduced. 3) Post-operative visual acuity is restored within a few days rather than weeks. 4) Less corneal scarring in the long term, less change due to healing (regression) and thus greater stability of the correction. When comparing only the benefits of Lasik over PRK the first impression is that Lasik has the potential to be a superior procedure. There is however, a very significant list of potential complications or risks and these include: 1) Failure of automated instrument to leave a hinge on the corneal flap, with the first incision. 2) Loss of the corneal flap during the operation. 3) Loss of the corneal flap after the operation. 4) Slipping of the flap and healing off center. 5) First incision too deep (perforation of the eye) or too shallow, causing a hole in the flap. 6) Invasion of the surface tissue into the central tissue of the cornea. 7) Infection of the cornea. 8) Loss of visual acuity - from scarring or from decentration of the PRK. 9) Technical problems with complex and finicky automated diamond-cutting devices. 10) The procedure is much more dependent upon surgeon's operating skills, than the computerized precision of the PRK procedure.

A Plea For MME. Loisel

Understanding Mathilde Loisel, the main character in Guy de Maupassant’s story The Necklace, is not simple.   Madame Loisel lived a humble life as the wife of a clerk; however, she desired the life of her rich friend Madame Forestier.   One evening Matilde’s husband came home with an invitation to an event at the Palace and Matilde responded with a disgusting displeasure to the invitation: â€Å"What do you wish me to do with that.†Nevertheless, Matilde and her husband found the money to acquire a dress and borrow a special diamond necklace from her friend Madame Forestier. At the Ball Matilde was the prettiest, most joyful, desired female of the evening. Upon returning home, Matilde realized she had lost her friend’s necklace. Matilde and her husband made up a lie and borrow money to replace the lost item. The fate Matilde found in replacing the necklace—ten years of hard labor— was to harsh.Her VanityWhat is the cause of Matilde’ s self induced punishment?   At first it appears to the reader that she is being rebuked for lying and losing the necklace.   But is this the case?   The cause of Matilde’s problem is not lying about the lost necklace, but her vain attitude towards the envy of a better life.   How does the reader know the cause of her punishment is vanity?First, Matilde will not attend the ball without the proper material possessions of a dress or jewelry.   Second, she is consumed by forming a lie to protect the necklace rather then telling the truth and taking responsibility for her fault.Third, Matilda is willing to sacrifice 10 years of hard labor to pay for her mistake.   In the end, Matilde over-reacted to the situation and her vanity caused her to cover-up a simple venial sin. Matilde’s over indulgence in her own self-interest is to blame for the creation of her elaborate lie.   The loss of the necklace is the result of her vanity.The PunishmentWhat price did Matil da pay for her attempt to cover up the vanity underneath the loss of the necklace and the lie to cover it up?   The reader knows that Matilde suffered ten years of drudgery in hard physical labor to repay the monetary value of the necklace.   Furthermore, Matilde’s husband worked extensive hours at his job and forfeited his inheritance to pay for the necklace.   Consequently, Matilde suffered the loss of her physical beauty while being impoverished as a slave to the households she cleaned.   In addition, Matilde and her husband were forced to resign any possibility of climbing the social ladder because the majority of their lives would be spent working to pay back the price of the necklace.   Matilde’s punishment was too harsh for simply being vain.The PleaMadame Loisel’s pride, which is a product of her vanity, has dealt her the cold hand of an ironic fate.   The ironic part in the story is that Madame Forestier’s necklace was not real to beg in with and Matilde’s perception of Madame Forestier and the upper class life turned out to be just as phony. Matilde should not have to pay the price she did for something that was not real to begin with.   In the end, Madame Loisel suffered an unjustified form of an ironic punishment in relation to the severity that her vanity should have caused.In a different set of circumstances, Matilde should have told the truth about the necklace from the moment she found out it was lost.   Had she done this her fate may have had a more positive result.   Nonetheless, the simple mistake of having too much self-importance does not deserve a life sentence of chastisement.Fortunately, Matilde ended up learning a lesson from her mistake and was able to tell the truth.     As a result, Matilde returned to her humble self and had the courage to approach Madame Forestier to find out the real truth.   The mistake Matilde made was that she borrowed a necklace to feel important for o ne night in her humble life and experience what rich people took for granted.   Matilde’s faults in her character should not inhibit her until death.   Madame Loisel did not deserve the unforgiving penalty of ten years of hard labor.   

The Power Of Love By Sue Johnson - 1457 Words

The bonds people form as infants from the time that person grows old, are important to their way of life (Johnson, 2016, p.10). The decrease of heart risk, the reduced stress, and the longevity of life are all aspects that come from a successful relationship with strong confident bonds (Johnson, 2016, p.13).The same can be said though for people with orientated and problematic relationships with harmful side effects like decreased life, excessive amounts of cortisol, and uncontrollable weight gain (Schaeffer, 2009, p.24). All the side effects shown and more have been proven with multiple researches and experiments throughout the years that support the claim; relationships can affect different aspects of a person’s life. In the magazine article, â€Å"The Power of Love† published by Time in 2016 and written by Sue Johnson, she explains that the quality of a relationship can have its health perks, but also it can be a peril in its absence. The disturbing truth is that an epidemic of depression is increasing steadily in this society. The rise in isolation and social disorder is so demanding on the human body it warrants a patient to doctor appointment (Johnson, 2016, p.10). This is because of the rise in technology, leading to the isolation a person might feel in life. It is often said that recently a person’s life partner is the only reliable source of comfort the significant other has in a society of isolation (Johnson, 2016, p.10). The bond people have with oneShow MoreRelatedThe Legacy Of The Vietnam War1691 Words   |  7 Pagesand that very production of consumer goods was the trade that many of those hurt the worst by the Great Depression relied upon.2 This vicious cycle was one t hat would continue to plague the country until a new problem, the need to address the rising power of Nazi Germany and her belligerent ally Japan, became too great to ignore. 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