Friday, January 24, 2020
LASIK Vision Correction Essay -- Lasik Seeing Eye blind Essays
LASIK Vision Correction      Are you ready to give up your glasses or contacts? LASIK vision correction is an up-and-coming procedure designed to reduce your dependence on glasses and contacts. My objective is to show both sides of the procedure, the risks involved and the wonderful possibility of not having to wear glasses or corrective lenses. Of patients with moderate vision impairments who have had the LASIK surgery performed, eighty-two percent achieve 20/20 vision or better and ninety-nine percent achieve 20/40 or better (May 60). However, LASIK vision correction is not for everyone. There are definite risks as well as possible side effects involved. Some of the side effects are hazing, night glare and halos, loss of vision, dry eye, infections and corneal abrasions.      LASIK stands for Laser-Assisted In Situ Keratomileusis and is a procedure that permanently changes the shape of the cornea, the clear covering on the front of the eye, using an Excimer laser (â€Å"LASIK†). A knife, called a microkeratome, is used to cut a flap in the cornea. A hinge is left at one end of the flap. The flap is then folded back revealing the stroma, the middlesection of the cornea. Pulses from a computer-controlled laser vaporize a portion of the stroma and the flap is then replaced (â€Å"LASIK†).      Initial clinical trials of LASIK in the United States began in 1996 with Marc Michelson, M.D. being one of the first LASIK surgeons involved. These clinical investigations culminated in the approval by the FDA of the LASIK procedure in 1999 (May 20). â€Å"LASIK is the most popular refractive [or vision correction] procedure worldwide right now,†Marc Michelson tells WebMD (Braslavsky). Michelson says that because the LASIK procedure has become very popular lately, patients need to be careful when choosing a surgeon. He emphasizes the need for patients to seek out someone with experience and a long history of good outcomes (Braslavsky).      There are many factors taken into account before becoming a candidate for LASIK surgery. Candidates for LASIK surgery should be at least 18 years old and not be pregnant or nursing. Candidates should also have no active eye disease, a stable prescription for one year and have no restrictions mandated by their employer. Having realistic goals is also an important factor. Some common goals are: 1.     To be less dependent on gl... ...ford LASIK vision correction. This just is not the case. This surgery is quite expensive and results are not guaranteed. Surgical complications are estimated to occur in between 1.2 and 2.2 percent of patients. The CRS-USA LASIK Study noted that, overall, 5.8 percent of LASIK patients experienced side effects at the three-month follow up period (â€Å"Risks†). My attempt here was to show that there are risks involved with this procedure and to encourage research to be done before a decision is made. Corneal abrasions, infections, hazing, dry eye, loss of vision, and night glare and halos are among the many possible side effects. Are you willing to take the risk?      WORKS CITED Braslavsky, Andrea M, MS. â€Å"Keeping an Eye on Side Effects of Laser Eye Surgery.†     2001 Healtheon/WebMD. 13 Oct. 2001.          . â€Å"Lasik Eye Surgery: Learning About LASIK.†U.S Food and Drug Administration.           13 Oct. 2001. . May, Carl J., M.D. LASIK Vision Correction. Utah: MedWorld Publishing, 2000. â€Å"Risks and Complications.†The LASIK Institute. Oct. 2001. 21 Oct. 2001      The May Eye Care Center and Associates. Bringing Your World Into Focus: Laser      Vision Correction.
Thursday, January 16, 2020
Why Courage Matters
McCain mean by saying that â€Å"without courage all virtue Is fragile†? It means that If we lack courage to hold on to our beliefs In the moment of testing, no just when everybody agrees with our opinion but also when they go against opposition, then our beliefs are superficial and weak and add nothing to our self respect for our virtues. Explain the concept of moral courage using an example. Is it different from physical courage?Moral courage: Is the ability to act rightly In the face of popular opposition, shame, scandal, or discouragement. This is the courage many people face on an everyday basis, always doing what Is right regardless of the consequences faced. Most people have a hard time doing the right thing when doing the opposite Is easier matter how hard It Is, and regardless of being Judged. This Is mostly because of human nature to care for their selves before others. For example, a group of guys walk down the street and watch a man's wallet fall from his pocket.Th e right thing to do is pick it up and return it back to the man. Because, there are a group of guys the better option is to walk away with the wallet. Therefore, your moral courage is questioned. All it takes is one person taking a stand for doing the right thing. Physical courage is familiar to many people: is courage in the face of physical pain, hardship, death, or threat of death. For example, when a building is caught on fire, people call the fire department. Firefighters run Inside that building regarding their fatty to help and protect the people trapped Inside.Regardless of the situation they make sure the people are safe, and sometimes losing their lives to save a stranger. Putting their lives on the line, not to overpower or harm others, but to serve and protect them. In these actions they deserve much respect for their hard work and dedication to serving others. What does McCain mean by â€Å"doing one's nearest duty'? Does the fact that McCain is a high-profile politici an add an element to that idea? Explain why or why not?It means that we should always strive to comply with our responsibilities and duties in every aspect of life. For five years, McCain was a POP in Vietnam. At one point he was offered his freedom but chose to stay behind with his fellow soldiers. That decision resulted In torture by his captors. Evaluate Moccasin's decision In terms of physical and moral courage, and the concept of ones' nearest duty. †resulted on more physical pain and torture. This action shows and represents mental courage and a sense of responsibility towards his personal duties.
Wednesday, January 8, 2020
What is Nitric Oxide - 1170 Words
What Is Nitric Oxide, And How Is It Used To Save Lives? Nitric oxide (NO) is a free radical found in our atmosphere, it is colorless, odorless, nonflammable, liquid soluble, and oxidises to nitrogen dioxide (NO2) when mixed with oxygen. Nitrogen dioxide when inhaled is a harsh respiratory irritant that can cause a fatal form of pulmonary edema and tissue hypoxia. NO is produced by combustion of fossil fuels by power plants, released by automobile engines, found in tobacco smoke and made naturally from lightning in thunder storms. NO is found in concentrations between 10 and 500 parts per billion but can exceed 1.5 parts per million in heavily polluted areas. Nitric oxide, know as a harmful gas in the atmosphere has a theraputic effect and is made naturally in the human body. L-Arginine, an amino acid that makes proteins in the body, is the main contributor of nitrogen for the crucial vasodilating molecules. Nitric oxide serves as a powerful vasodilator diffusing readily through various tissues and regulates blood flow in the lungs and in endothelial cells. Nitric oxides positive effects contribute to homeostasis control, vasomotor tone, and neurotransmission. Up until 1989, there were no evidence of NO having any biological functions until, several years of clinical testing evidence was found that Nitric oxide had a major role as a messenger molecule in at least three systems: white blood cells, where Niticmediates tumoricidal and bactericidal effects; blood vessels,Show MoreRelatedAcid Rain From The Scottish Chemist Essay1643 Words  | 7 Pagesbegins to take place. Acid precipitation begins in the atmosphere since this is where most of the pollutants are being combined to create many of the acids that aid in the acidity of acid rain. 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