This website uses cookies to ensure you have the best experience. Learn more

Human Vision Defects,What Is 20/20 Vision?

983 words - 4 pages

Visual DefectsWhat does 20/20 Vision mean?Visual acuity is expressed as a fraction. The top number refers to the distance you stand from the chart. This is usually 20 feet. The bottom number indicates the distance at which a person with normal eyesight could correctly read the line with the smallest letters. Normal vision is considered 20/20. If your vision is 20/40, the line you correctly read at 20 feet could be read by a person with normal vision at 40 feet. Of course, just because 20/20 vision is normal doesn't mean it's perfect. A small percentage of the population is blessed with vision better than 20/20, and just recently researchers unveiled corrective lens that offered vision closer ...view middle of the document...

In other patients poor blood supply to the vital optic nerve fibres, a weakness in the structure of the nerve, and/or a problem in the health of the nerve fibres themselves may cause the damage.Effects of GlaucomaChronic (primary open-angle) glaucoma is the commonest type, and dangerously it has no symptoms until eyesight is lost at a later stage. Damage progresses very slowly and destroys vision gradually, starting with the side vision. One eye covers for the other, and the person remains unaware of any problem until a majority of nerve fibres have been destroyed, and a large part of vision has been destroyed. This damage is irreversible by any means and it's is progression is usually relentless. Treatment cannot recover what has been lost. But it can arrest, or at least, slow down the damage process.Normal Vision The same scene as itmight be viewed by aperson with glaucomaTreatments for GlaucomaAlthough there is no cure for glaucoma it can usually be controlled and further loss of sight either prevented or at least slowed down. Treatment can save remaining vision but it does not improve eyesight.Treatments include:Eye drops - these are the most common form of treatment and must be used regularly. In some cases pills are prescribed. The drops can be varied to best suit the patient and the type of glaucoma.Laser (laser trabeculoplasty) - this is performed when eye drops do not stop deterioration in the field of vision.Conventional Surgery - this is performed usually after eye drops and laser have failed to control the eye pressure. A...

Other Essays On Human Vision Defects,What Is 20/20 Vision?

Management And Leadership Essay

1041 words - 5 pages , consult, involve, explain why as well as what needs to be done." (Chapman, 2001-4) People do not like to be ordered around or told what to do. They want to be involved and feel as if they are part of the team, that they can make a difference; a leader needs to let them believe that the leader's vision is their vision, and then they will accept responsibility for achieving it. Leaders must be genuine team builders; they need to know their own

A Project On Night Blindness, How It Is Caused, Treatment Of Night Blindness, Symptoms, And Preventing Night Blindness

737 words - 3 pages any kind.Symptoms:Symptoms include difficulty seeing when driving in the evening or at night, poor vision in reduced light. You may have a feeling that your eyes take longer to "adjust" to seeing in the dark. Initially there is slight difficulty in seeing in dim light later this progresses. The field of vision becomes narrow then later limitations in day vision. If no medication is taken blindness can occur. Toxic symptoms can occur with a large

Barco Projection System

487 words - 2 pages technologically superior quality. But in 1989, Sony introduced 1270 Superdata Projector at the Siggraph trade show in Boston and won the first place in Highest Performing Projector category from BPS' BG400, much to the surprise of Barco. 1270 was also price about 20-40% lower than Barco's projectors. This put BPS under pressure to sustain the attack from a giant company such as Sony and come up with measures to counter attack.1. How serious a threat is the

An Essay About Inherited Diseases. It Gives Examples And Explains Them Very Well

4787 words - 20 pages child develops the disease only if he or she receives a mutated allele from each parent. When both parents are carriers, there is a 25 percent chance that a child will not have the disease, a 25 percent chance that it will have the disease, and a 50 percent chance that it will be a carrier.Recessive Inheritance DiseasesColor Blindness, defect of vision affecting the ability to distinguish colors, occurring mostly in males. Color blindness is caused


2241 words - 9 pages for people of all ages--freedom to define social and sexual relationships--a popular culture which enhances rather than degrades one's self respect and respect for others--support for internal development and self-determination for countries around the worldWe outline this vision to be more concrete about what a socialist feminist society might mean or try to be. This vision of society is in direct opposition to the present one which is based on

Conceptualizing A Business

1057 words - 5 pages University of PhoenixJuly 18, 2009MKT/421IntroductionThe mold that holds companies together are the Mission and Vision Statement is the mission and vision statements define who a company is and what the company is about. The vision statement defines the company's motivation the vision statement illustrates what the company plans to become and provides strategic decision methods. Companies must live by standards and codes in order to successful

Organisational Culture- Analysis Of Oticon

4559 words - 19 pages working and culture to let loose the human potential of the company. Kolind created a vision of a service-based organization and pursued it to gain a competitive edge.Employee involvement is crucial to successful change; especially in situations as Oticon's that require attitudinal and cultural change. Planned and emergent perspectives stress that this is a slow, learning process. Rapid organizational transformations can only be successful if

In Not More Than 300 Words, Write A Descriptive Account Of Harmen Steenwyck's "Still Life: An Allegory Of The Vanities Of Human Life"

372 words - 2 pages "An Allegory of the Vanities of Human Life" by Harmen Steenwyck is an oil painting which falls within the genre of a "Vanitas" popularised by Dutch painters during the 17th century. The theme of this type of painting is meant to evoke thoughts of the futility of possessions within human life.The angle of vision is close to and looking down drawing the spectators gaze upon a wooden table housing various objects. A strong shaft of light, perhaps

Organizational Trends Discussion

663 words - 3 pages Organizations must develop methods for ensuring that high-performance is encouraged. High-performance organizations achieve greater success than traditional organizations. All organizations experience forms of stress. Strategies can be implemented to manage and reduce stress in the workplace. Trends continue to emerge in high-performance organizations and new stress management techniques have developed over time.The characteristics of a high

Maybe Capitalism Isn't The Way After All

1653 words - 7 pages are blamed for what they are, people assume that they chose to become poor at their own free will. I have unfortunately witnessed with my own eyes more than once police in Egypt physically abusing powerless street vendors. The abuse doesn't stop at being physical but at being called names so vulgar and crude that one begins to wonder how they don't explode in the faces of those officers. The government will only wake up when one day the country is

The Ten Commandments

2291 words - 10 pages verse in the Commandment about Sabbath is completely different in the versions of the two authors. P states: "Therefore the Lord blessed the Sabbath day and made it holy" (Ex 20:11), which is also a hint to the creation story. This also underlines that P is concerned with priestly topics (what fits the theory that P is a priest). D writes: "Therefore the Lord your God has commanded you to observe the Sabbath Day" (Deut 5:15). This phrase "as the

Similar Papers

Comparison Of King Lear And Gloucester

943 words - 4 pages of apparent and inane flattery from Cordelia. Physically being able to see all the praises and loyalties people has devoted to him, Lear yet has been truly blinded in heart by his lack of insight. Living in his own world which full of lies and pretenses, the King loses his clear vision to determine what the reality is. Also misjudging the truth, Gloucester shows his weakness from believing in Edmund, the bastard, so easily without even

Science Essay

2126 words - 9 pages By : Sahar Barghian Understanding The Human Eye Table of Contents Keeping your eyes healthy ............ Error! Bookmark not defined. Why is wearing sunglasses a good strategy ...... Error! Bookmark not defined. Types of Protection your eye needs ..............................................3 Pros and Cons ...............................................................................4 Myopia

Persuasive Essay Gay And Lesbi

623 words - 3 pages Persuasive Essay - Gay and Lesbian Rights "If anyone says, 'I love God,' yet hates his brother, he is a liar. For anyone who does not love his brother, whom he has seen cannot love God, whom he has not seen," John 4:20. So, why do heterosexual people hate homosexuals? They are ordinary people with a different lifestyle who would simply like to be treated with respect. Many organized religions believe that a 'gay' lifestyle is wrong. But, if

Six Sigma Essay

529 words - 3 pages Six Sigma is defined as a statistical term that refers to 3.4 defects only per million processes undertaken by, or products made by, a company. This focus on product quality leads to lowered costs of operation for the company. Lower costs ultimately lead to higher profit margins. Six Sigma is the benchmark-Four Sigma is average.A successful Six Sigma program must start with the CEO of a corporation. The CEO must express their personal vision