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Eye strain associated with computer use isn't thought to have serious or long-term consequences, but it's disruptive and unpleasant. Eye strain occurs when you over-use your eye muscles. Any muscle held in one position too long will strain. More than 50 percent of computer users experience eyestrain, headaches, blurred vision and other visual symptoms related to sustained use of the computer. This type of stress on the visual system can also cause body fatigue and reduced efficiency at work. Generally speaking the most common cause of eye strain is from overuse. There are a small number of causes which can result in people suffering from Eye strain and sometimes accompanied by headaches. When used for concentrated work there is a tendancy to blink less frequently. This leads to drying of the eyes resulting in a burning or pricking sensation.

Eyestrain is a common complaint of office workers, made more common in recent years by the widespread use of video display terminals (VDTs). The main problems that cause eyestrain and associated headache include hyperopia is where the light is focused behind the retina and consequently the image is blurred close up. Hyperopia is corrected by spectacles or contact lenses. Astigmatism is another type of visual defect and can accompany myopia or hyperopia. Astigmatism is when the cornea is not a perfect spherical shape so that images will be more blurred in some particular directions. Astigmatism may cause a blurring of objects at all distances and even a tendency for the person to squint in order to improve vision. Astigmatism is also correctable with spectacles and contact lenses. Presbyopia is another type of eye condition and frequently occurs with the ageing process.

Eye-Ease Tips

1. Computer glasses that focus at the right distance for the computer screen.

2. Wearing contact lenses --- corrected for computer or reading distance in one eye, and for far distance (if needed) in the other eye.

3. To reduce glare, position your VDT so that neither you nor the screen faces a window. If necessary, use a hood or glare-reduction screen.

4. To lessen strain on eye muscles, keep your VDT screen 18 to 28 inches from your eyes, and no higher than eye level when you're seated in your chair.

5. Use dimmer lighting around your VDT. Dim lighting reduces glare and makes the screen easier to read.

6. Adjust the screen's brightness and contrast controls for your best comfort.

7. If your screen has color options, choose those easiest on your eyes.

8. Nutrition is also very important for reducing eye strain.

9. Try to avoid eye drops if you can.

10. Take the Rest-Simple one-minute eye excercises can reduce eye fatigue.

Juliet Cohen writes articles for skin care tips and beauty tips [http://www.beauty-makeup-advice.com]. She also writes articles on makeup tips.

Nutrition that Supports Eye Health

Your vision is one the most precious gifts you have. Maintaining good vision and eye health throughout your lifetime is important. There are a number of proactive tips that can help you to take care of your most delicate sensory organ—your eyes.

If you are concerned about your eyes you should be mindful of the sun’s rays, working long hours staring at your computer, watching television, pollution and environment, and a poor diet—all which can affect eye health. Simple eye care health tips can help you to protect your eyes from possible damage due to environment and the stress of everyday life.

Wear sunglasses when you’re out. The UV rays of the sun can harm your eyes as well as your skin. Optometrists say you should wear sunglasses on a sunny day or a cloudy day. Clouds may partially block the sunlight, but UV rays can penetrate clouds. Even if you wear UV-protected contact lenses, you should wear sunglasses to protect the whites of your eyes.

Computer tips. Keep your monitor about five to nine inches below eye level. This position offers the least strain on the eyes and is conducive to blinking. Most people working on the computer do not blink as often as they should. Blinking helps retain moisture levels in the eyes and is good exercise for the eyes. Following the “20/20/20 rule” may also help relieve eye strain caused by too much time on the computer. Every twenty minutes look away from the computer and fix your gaze about 20 feet away for 20 seconds. This will help keep the eyes focused. Splashing cold water over your eyes during breaks can ease eye tension.

Regular exercise. Engage in a regular exercise program. Exercise helps to maintain optimal blood circulation and ensures that the eyes receive a supply of oxygenated blood.

A healthy digestive system. Eye health, as with overall health, depends on the proper absorption of nutrients.

Drink plenty of water. Drink about 8 to 12 glasses of water a day. Cloudiness in the white of the eyes may be due to insufficient water intake.

Get sufficient rest. Getting a good night’s sleep refreshes the eyes. Lack of sleep can cause the eyes to appear tired and lacking in luster. Tired eyes may not perform at optimal levels during the day.

Smoking and alcohol consumption. Smoking can have adverse affects on overall health and, particularly on eye health. Smoke irritates the eyes and eventually may effect the proper functioning of the eye. The same is true for alcohol. Too much alcohol can also diminish your body’s ability to absorb Vitamin A.

Do not rub eyes. Do not rub tired eyes, as any irritant in the eye can damage the surface of the eye. Instead, palm your eyes and massage in circulation motion.

Contact lens wearers. Most contact-lens wearers make the mistake of overusing their contacts. Contact lenses are not designed to be worn for more than twelve hours a day, as it can cause discomfort and may lead to eye damage.

Eye nutrition. Including plenty of fruits and vegetables in your diet is a good way to get the proper nutrition to support eye health. Vitamins and minerals, such as, Vitamins A, C and E, zinc, selenium, folic acid benefit overall health, but are especially beneficial to eye health.
Cabbage, carrots,, papayas, green peas, spinach and other green leafy vegetables such as lettuce, collard greens, turnips, broccoli, and kale are all rich in beta carotene and other eye nutrients. Liver, lean ground beef, egg yolks and seafood are also healthy for the eyes.
Eye nutrients you should consider incorporating in your diet include:
Bilberry:Bilberry has been used for centuries to support eye health. Its nutrients can help protect against eyestrain and fatigue. Bilberry also supports a healthy blood circulation to the eyes.
Vitamins: Vitamins A, C and E are antioxidants. Vitamin A is well-known for its role in supporting eye health. Vitamin C nutritionally helps in tissue cell regeneration and supports healthy blood vessels. All three of these vitamins can help to protect the body, including the eyes, from free radicals. Vitamin A supports the regeneration of rhodopsin—which is found in the rod cells of the human eye.
Carotenoids are powerful antioxidants, too. They also nutritionally protect cells from free radicals. Carotenoids, specifically beta-carotene, are believed to enhance the function of the immune system. Beta-carotene is the precursor of vitamin A in the body. High concentrations of certain carotenoids are found in the eyes. Eating foods which have greater amounts of these carotenoids may help maintain eye health.

For Eye Health Try to Eat Foods that Contain:

Lycopene helps to maintain optimal vision. Lycopene is found in tomatoes; processed tomatoes contain higher concentration of lycopene.
Lutein is found in the center of the retina, called the macula. Lutein is found in food sources such as spinach, broccoli, and peas. Often called, “nature’s sunglasses”, lutein protects the eyes from blue light present in sunlight, fluorescent light, welding light, and light emitted from television and computer screens.
Zeaxanthin, like lutein, is found in the macula in high concentration. Lutein and zeaxanthin are often found in combination in the same vegetables, likespinach, broccoli and peas.
Selenium is necessary for the absorption of Vitamin E. Mixed nuts, especially Brazil nuts, are rich in selenium. Fish is another good source.
Zinc is highly concentrated in the retina. It is essential for oxidation and metabolism. Zinc is also responsible for the release of Vitamin A from the liver. Zinc is found in abundance in protein-rich foods. All kinds of meat and fish contain zinc. Dairy products and pumpkin seeds also contain zinc.
Copper is needed for the assimilation of zinc. Food sources that contain copper include green leafy vegetables, whole grain cereals, organ meats and nuts.
It is important to begin the right eye health care regimen as early as you can to maintain eye health. As you age your body’s ability to absorb nutrients that are required to support eye health may change.If you are not able to maintain a balanced diet, you may want to consider eye health supplements for a consistent supply of nutrition that will promote eye healthcare. Taking a supplement like Crystal Vision Matrix to nutritionally support eye health can help to close the gaps your diet may leave. Ask your doctor whether a supplement, like Crystal Vision Matrix, is the right choice for you.

About the Author

New Vitality is a health supplements company. It develops supplement products which are carefully formulated under the guidance of an elite panel comprised of renowned doctors, nutritionists, chemists and researchers. Whether you want a nutritional supplement, pet health supplement, a personal care product or a health care product, New Vitality is a one-stop shop for all needs.

Suppost a referee lifts a puck from rest on the ice and holds it at eye-level(Height h) to examine it.?

How much work did the referee do on the puck?
What is the change in kinetic energy of the puck?
How does this agree with the Work-Energy theorem?

W = Fd

Work = Force x distance

The ref is lifting the puck vertically, so the force will be the mass of the puck, times gravity times h (the distance from the ice to the puck.

W = mgh, in other words. You don't give any values so it's hard to give you any numerical answer.

Before Symptoms Arise, New Tool Helps Scientists 'See' Molecular Signals Of Eye Disease
Forget what you know about how diseases are diagnosed - new research published in the May 2010 print issue of The FASEB Journal details a noninvasive ground-breaking tool that detects signs of disease at early molecular stages before symptoms can be seen using traditional methods. Even better, this tool promises to detect some eye diseases so early that they may be reversed before any permanent ...

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