You’re walking outside when rain is falling down in icy sheets chilling you to the bone. Water keeps condensing on the glasses lens and fogs your vision. You erase any remains, but it keeps happening. There’s got to be a better solution!
Contact lenses are a thin lens placed on the surface of the eye. They are considered a medical device that can be worn for correcting vision, cosmetics, or therapeutic reasons. It has been estimated that 125 million people use contact lenses worldwide, which is approximately 2% of the world’s population. Contact lenses are shaped based on the vision problem to help the eye focus light directly on the retina. There are four main reasons to wear corrective contacts:
• Hyperopia (you cannot see close up)
• Myopia (you cannot see far away)
• Astigmatism (refractive error of the eye)
• Presbyopia (aging eyes)
Hyperopia
If you are farsighted, your eye does not have enough focusing power — light rays fail to form a focus point by the time they reach the retina. Contact lenses rectify hyperopia by converging light rays, which increases the eye's focusing power. This moves the eye's focus point ahead, onto the retina where it belongs. To correct farsightedness the contact lens is thicker in the center and thinner at the edges. These lenses are known as convex.
Myopia
If you have myopia, light beams focus too early within your eye — they form a focus point in front of the retina instead of right on it. Contact lenses correct nearsightedness by separating light rays, which minimizes the eye's focusing capability. This moves the eye's focus point back, onto the retina. Contact lenses designed to correct nearsightedness are thinner in the center and thicker around the outside. These types are cal...
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...ision problems that can easily be corrected with something as simple, yet intricate as a little piece of plastic.
Works Cited
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"Hyperopia (Farsightedness) and You." Hyperopia (Farsightedness) Causes. Alcon, 2014. Web. 06 Mar. 2014. .
Lens Crafters is an international eye care, eyewear, and sunglass organization. Their mission statement sums it up “We love your eye.” The overall goal is to provide better sight & eye care for everyone. The company started in 1983. It currently has stores domestically and internationally. The company has 90 stores and was founded by E. Dean Butler. LensCrafter has independent Optometrist in their store; the operation strategy that will stabilize and overall support their vision that will lead to increase profits within their business.
Press, Dr. Leonard J. “An Eye Doctor Answers Questions (FAQs) about Vision Therapy, Visual Training, Eye Exercises, Pediatric Optometrists, Developmental Optometrists, Ophthalmologists.” N.p., n.d. Web. 9 Dec. 2013.
Eaton,Joe, and Donald David. “Practice of billing medicare to fix droopy lids raises eyebrows”. Miami Herald. Miami Herald, 28 May. 2013. Web. 4 Feb 2014.
My interest in the career of optometry stems from my first experience in the optometry office to receive my first pair of glasses when I was in middle school. I distinctly remember the moment when my optometrist slipped my new glasses over my eyes for the first time. Suddenly, everything in the room came into sharp, clear focus. I knew that the glasses would help me see the board in school, but I was astonished to find that I could see small details about the room, as it had never before occurred to me that I should have been able to see these details. I was also surprised that I was even able to see the expressions on the faces of people who were standing far away from me. It was one of the most incredible, freeing, and empowering moments of my life. As I walked out of the optometry office, I felt
As humans age, they frequently develop a condition known as presbyopia. This condition decreases the person's ability to focus sharply on those object which are nearby and is the result of the lens of the eye hardening. In addition, astigmatism requires a person wear prescription eyeglasses and/or contact lenses. Astigmatism arises when the curvature of the eye is irregular. The eye is normally shaped liked a soccer ball or basketball. With astigmatism, it takes on a more oval shape and resembles a football. Due to the irregular curvature, the eye processes light differently and leads to blurred vision. The degree of blurriness is determined by the degree of
This is a representation of the eye's lens system. This eye has no eye condition, such as nearsightedness or farsightedness, and the lens is drawn in its relaxed position. The light rays are focused appropriately on the retina. The thickness of the cornea is 0.449 mm, the distance from the cornea to the lens is 2.
Optometry involves of a combination of intricate practical skills and academia allowing the improvement of an individual’s vision as an outcome changing their quality of life. I would feel privileged to gain the opportunity to study Optometry enabling me to improve the ocular health and vision of others as it would be a valuable contribution to the society.
Now for our eyes we use them for vision, their like our own personal camera’s,
(Beam "What Are Bifocals?"). With these two-line bifocals one can look through the upper half to see far away and the lower half to see closer things. Many historians question who invented the bifocals although, due to letters written by Benjamin Franklin to his friend George Whatley, it is a known fact that Franklin was indeed the true inventor of the bifocals (The Electric Franklin "Benjamin Franklin's Inventions"). They are generally used by people over forty years old (Heating "Bifocals and Trifocals for Vision Over 40"). Single vision glasses and bifocals are very different types of glasses because they only help people with nearsightedness.
When the contact lens was invented, the world of vision correction was altered forever. No longer were those people lacking perfect 20/20 vision forced to look any different than everyone else. Both discrete and revolutionary, the contact lens provided a brand new, viable, alternate solution to an age-old problem. After centuries of engineering and discovery the contact lens has evolved greatly. Presently contact lenses are made hard or soft, for daily or continuous wear, gas permeable, and even providing ultraviolet protection. A properly fitted pair of today’s discrete, convenient, versatile, and inexpensive contact lenses provide the best form of vision correction available in today’s market.
In the United States, an estimated 1% of primary care visits are related to conjunctivitis. About 70% of individuals with conjunctivitis go to their primary care provider or urgent care. Advanced cases of the condition may require referral to an ophthalmology specialist, particularly if first-line treatment was unsuccessful.
Another eye disorder is farsightedness, also known as hyperopia. With this disorder, objects are seen clearly far away but are blurry close up. The eyeball is too short for the lens to focus a clear image on the retina. More than half of all people who wear glasses are farsighted. The signs and symptoms of farsightedness are aching or burning eyes, suffering from eyestrain, general tension, fatigue or headaches after close work, becoming irritable or nervous after prolonged concentration, and difficulty concentrating and maintaining a clear focus on near objects.
...he cornea is deformed so that its surface is oval instead of spherical. Light rays are distorted at the entrance of the eye. This produces a blurred image and is known as astigmatism. To correct it, glasses are given a nonspherical or cylindrical curvature. Cross-eyes and walleyes are produced when both eyes do not work together because of weakness of the eye muscles.
There are ways though to improve design. One may review the design over and over again, from all perspectives, to ensure that there are as minimal “flaws” as there can be, since these flaws cannot totally be eradicat...