阅读理解
Are your eyes irritated, dry, watery, blurry, seeing double
or sensitive to light, and do your back and neck ache? If so, you are likely
one of many people today who suffer from digital eyestrain, also called
computer-vision syndrome.
Eyestrain is often related to the amount of exposure to
screens, the distance from eyes to screens and the use of multiple screens
simultaneously. However, studies have also shown that the blue light produced by
digital devices today reaches further into the eyes than other kinds of light.
This light actually assists attention during the day but can result in
interrupted sleep patterns at night.
Scientists have also said that eyestrain is not a necessary
evil, even in a modern world that revolves around technology. Changing some
simple details about your relative position to screens, such as staying about
60 centimeters away, will help. Also, avoid overhead and other direct sources
of light, and use shaded lamps and window blinds while looking at digital
devices instead.
Beyond the way that relates to digital screens, there are
also ways to change how you view screens that are helpful in combating
eyestrain. To begin with, your computer screen should be high-resolution(高清的), at least 50 centimeters wide
diagonally and may require a screen filter to decrease reflections. Also, be
aware that "computer glasses", which cut down glare and blue light,
are available and those contact lenses can increase the risk of eyestrain.
Besides, to reduce your risk for computer-vision syndrome
and neck, back and shoulder pain, take frequent breaks during your computer
workday. Many workers take only two 15-minute breaks from their computer
throughout their day. According to a recent study, discomfort and eyestrain are
significantly reduced when computer workers take four additional five-minute "mini-breaks"
throughout their workday. And these additional breaks don't reduce the workers'
productivity.
Finally, many of us fall into bad habits while using digital
screens that only worsen the effects of eyestrain. While viewing digital
screens, many people blink one third less often than they usually do. Place a
reminder on your computer to "blink" so that your eyes don't dry out.
Also, rest your eyes' focusing muscles by using the 20-20-20 rule: Every 20
minutes, focus on something 20 feet away for 20 seconds.