specialty items
| Computer Glasses
Personal computers are a fact of life at the office and a growing part of many households. If using your computer gives you headaches, eyestrain, neck or shoulder tension, you may be suffering from the effects of excyclorotation. Clinically, excyclorotation is an outward rotation of the eyes. This often occurs when an individual views a computer screen. On average, more than 50% of the work force now uses a computer on the job-and nearly 60 million people experience vision problems as a result. Their condition is called Computer Vision Syndrome (CVS); there are a million new cases each year.
CVS is characterized by eye irritation, such as dry eye; red, itchy, watery eyes; fatigue, including heaviness of the eyelids or forehead; and difficulty focusing the eyes. These symptoms can cause headaches, backaches, and muscle spasms.
Anyone who spends two or more hours a day working on a computer is at risk for developing CVS. The reason is simple: human vision is not suited for staring at a computer screen. Computer images are made up of tiny dots, known as pixels. Since your eye cannot focus on them, you must constantly refocus to keep images sharp. Eventually, you get repetitive stress of the eye muscles. A monitor is a dynamic signal, in that the screen is constantly being "redrawn" A monitor creates images on the basis of varying light intensity through a fixed set of red, green, and blue points. This results in less distinct edges, and lower contrast The illumination profile of points on a monitor is not sharp (bright to dark), but is somewhat rounded, again reducing contrast.
|
