When you work at a computer for any length of time, it’s common to experience eye strain, blurred vision, red eyes and other symptoms of computer vision syndrome (CVS). This is because the visual demands of computer work are unlike those associated with most other activities.
If you’re under age 40, eye strain or blurred vision during computer work may be due to an inability of your eyes to remain accurately focused on your screen or because your eyes have trouble changing focus from your keyboard to your screen and back again for prolonged periods. These focusing (accommodation) problems often are associated with CVS.
If you’re over age 40, the problem may be due to the onset of presbyopia — the normal age-related loss of near focusing ability. This, too, can cause CVS symptoms.
What can you do? For starters, have a comprehensive eye exam to rule out vision problems and update your eyeglasses prescription. Studies like this one published by Optometry have shown that even small inaccuracies in your prescription lenses can contribute to computer vision problems.
If your glasses are up to date (or you don’t need prescription eyewear for most tasks) and you continue to experience eye discomfort during computer work, consider purchasing customized blue light computer glasses. These special-purpose glasses are prescribed specifically to reduce eye strain and give you the most comfortable vision possible at your computer.
Why computer glasses?
Computer glasses differ from regular eyeglasses or reading glasses in a number of ways to optimize your eyesight when viewing your computer screen.
Computer screens are usually positioned 20 to 26 inches from the user’s eyes. This is considered the intermediate zone of vision — closer than driving (“distance”) vision but farther away than reading (“near”) vision.
Children and young adults who need prescription eyeglasses are usually prescribed single-vision lenses. These lenses correct the wearer’s nearsightedness, farsightedness and/or astigmatism, and the shape of the lens inside the eye automatically adjusts to provide the extra magnifying power required for computer vision and near vision.
When a person’s close-up vision becomes less clear due to presbyopia after age 40, this age-related loss of natural focusing power affects reading and seeing a smartphone or computer vision clearly and comfortably. Bifocals can provide clear distance and near vision, but intermediate vision (needed for computer use and seeing your smartphone) often remains a problem. And progressive lenses or trifocals, though they offer some help for intermediate vision, often don’t have a large enough intermediate zone for comfortable computer work.
Do computer glasses really work?
Without computer eyeglasses, many computer users often end up with blurred vision, eye strain, and headaches — the hallmark symptoms of computer vision syndrome. Worse still, many people try to compensate for their blurred vision by leaning forward or by tipping their head to look through the bottom portion of their glasses. Both of these actions can result in a sore neck, sore shoulders and a sore back.
Though they are sometimes called “computer reading glasses,” it’s best to call eyewear designed specifically for computer use “computer glasses” or “computer eyeglasses” to distinguish them from conventional reading glasses.
Generally, computer glasses have about 60% of the magnifying power of reading glasses. But the optimal magnification depends on how far you prefer to sit from your computer screen and how close you like to hold your digital devices.
Computer glasses should also accurately correct any astigmatism you might have, and precise measurements should be taken to ensure the optical center of each lens is directly in front of your pupils when you are using your preferred working distance.
For these reasons, computer glasses should be customized to your individual needs. Using weaker, non-prescription reading glasses for computer use and seeing your digital devices typically won’t provide the accurate vision correction you need for sustained clarity and comfort.
Computer glasses put the optimum lens power for viewing your computer screen right where you need it for a clear, wide field of view without the need for excessive focusing effort or unhealthful postures. University research also shows custom computer eyewear can significantly increase worker productivity.
Lens designs for computer eyewear
Many special-purpose lens designs work well for computer glasses — whether you use a computer primarily for working or gaming. Because these lenses are prescribed specifically for computer use, they are not suitable for driving or general purpose wear.
The simplest computer glasses have single-vision lenses with a modified lens power prescribed to provide the most comfortable vision at the user’s computer screen. This lens power relaxes the amount of accommodation required to keep objects in focus at the distance of the computer screen and provides the largest field of view.
Single-vision computer glasses reduce the risk of digital eye strain, blurred vision and unnatural posture that can cause neck and back pain, and they can be used comfortably by young and old computer users alike.
Another popular lens design for computer glasses is the occupational progressive lens — a no-line multifocal that corrects near, intermediate and, up to a point, distance vision.
Occupational progressive lenses have a larger intermediate zone than regular progressive lenses for more comfortable vision at the computer. But this leaves less lens area for distance vision, so these lenses are not recommended for driving or other significant distance vision tasks.
Other lenses used for computer glasses include occupational bifocal and trifocal lenses. These lined multifocal lenses have larger zones for intermediate and near vision than regular bifocals and trifocals, and the position of the intermediate and near zones can be customized for your particular computer vision needs.
Your optometrist or ophthalmologist can help you decide which lens design will best suit your needs for computer glasses.
Very important: Always make sure you discuss and make decisions about your eye care based upon a formal appointment with your optician or doctor.
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KOBRIN & MARTIN OPTOMETRISTS, SANDTON
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