How Do Computer Glasses Work?
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Visual Problems
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Computer glasses work directly on the common effects caused by looking at a computer screen for long periods of time. According to AllAboutVision.com, these typically include blurred vision and eye fatigue. Many computer users look back and forth from the screen to their keyboard, papers, or books. This rapid changing can lead to the symptoms of computer vision syndrome, or CVS. In computer users over age 40, CVS can also be caused by problems focusing on the print on a screen due to normal changes in the eye, known as presbyopia.
Other Effects
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Even though CVS is primarily a visual problem, AllAboutVision.com says that it can lead to other physical effects. These include soreness and stiffness in the neck, shoulders and back caused by continually leaning forward in order to read the computer screen. If a person wears regular glasses for nearsightedness or farsightedness, they can develop soreness if they keep tipped their head up so they can read the screen through the bottom part of their regular glasses.
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Correction
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Computer glasses are made to directly correct the effects of CVS. There are several types, based on an individual's needs and eyesight, but the most common computer glasses have single vision lenses that are geared to let a person see comfortably when looking at their computer screen. The lens power is modified to maximize vision when the user is looking at a screen placed a typical distance away from her eyes. With these computer glasses, he can comfortably focus on print and objects on the computer screen.
Computer users over 40 who have presbyopia usually get computer glasses with progressive lenses. These glasses are no-line bifocals that correct near, middle, and distance vision. They have a larger middle zone than a regular prescription for progressive lenses. This allows a person to see more comfortably when looking at a computer screen. Because of the larger middle zone, there is less lens space for distance vision. This means these glasses should only be used when working on a computer, and they should never be used for tasks that depend heavily on distance vision, like driving.
In addition to the correction, computer glasses are often lightly tinted to encourage the eye to relax and focus on the screen.
Types
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Computer glasses typically come in two types. They may be a standard pair of glasses or clip-ons that can be worn over regular glasses. Most commonly, eye doctors prescribe a standalone pair of computer glasses. These are only worn when working at a computer.
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Resources
- Photo Credit Photo: Wikimedia Commons (Victorrocha)
