Computer glasses: Custom glasses for computer use
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What are computer glasses?
Computer glasses are eyeglasses specifically designed for viewing computers, tablets and smartphones. Computer glasses are intended for close-up tasks only. They should not be worn for driving or general purpose use.
Why wear computer glasses?
It’s common to experience signs and symptoms of digital eye strain when viewing screens for extended periods of time. These include:
Digital eye strain is also called computer vision syndrome.
Our eyes (and bodies) aren't made for staring at a near object — like a glowing computer screen — for long periods of time. This causes strain and fatigue of the ciliary muscle inside the eye that controls the shape of lens and the focusing power of the eye. It also tires the extraocular muscles surrounding our eyes that control eye position and alignment. The tiring of these muscles leads to discomfort and visual symptoms.
Wearing computer glasses can reduce the risk of eye muscle fatigue and discomfort caused by prolonged screen time.
Some computer glasses also shield your eyes from potentially harmful blue light emitted by digital devices. More research is needed to determine if long-term exposure to blue light from digital devices increases the risk of macular degeneration or other eye problems later in life. But laboratory studies have shown that blue light can damage cells in the retina that are essential for sight.
RELATED READING: What is asthenopia?
How computer glasses work
Basically, computer glasses reduce how much focusing your eyes must do when viewing digital devices. This is comforting for people of all ages. It's particularly helpful if you’re over age 40. This is when we begin to experience symptoms of presbyopia — the normal age-related loss of near focusing ability.
Computer glasses should also correct any nearsightedness, farsightedness or astigmatism you have. Research shows that even small amounts of uncorrected refractive errors can cause computer vision problems and reduced productivity.
Computer glasses vs reading glasses
For greatest comfort, your computer screen and digital devices should be about 20 to 26 inches from your eyes. This is considered the intermediate zone of vision — closer than driving (“distance”) vision, but farther away than reading (“near”) vision.
If you are under age 40 and wear prescription eyeglasses, these glasses will provide clear vision at all viewing distances. But focusing on intermediate and near objects still requires effort by the ciliary muscle in your eye. The longer you stare at your computer and phone screens, the more fatigued this muscle and your eyes become.
If you are beginning to experience presbyopia, bifocals can provide clear distance and near vision. But intermediate vision (needed for computer use and seeing your smartphone) often remains a problem. Progressive lenses and trifocals offer some help for intermediate vision. But they often don’t have a large enough intermediate zone for comfortable computer work.
For these reasons, many people try reading glasses for computer use. But these, too, have limitations.
Generally, computer glasses have about 60% the magnifying power of reading glasses. (The optimal magnification depends on how far you prefer to sit from your computer screen and how close you hold your digital devices.)
Store-bought reading glasses are simply magnifying lenses in a frame.
Good computer glasses, on the other hand, do three things:
Correct any refractive errors you have
Provide the optimum amount of magnification for viewing your digital devices
Protect your eyes from blue light
Also, custom computer glasses position the optical center of the lenses directly in front of your pupils when using your devices. This intermediate pupillary distance is not customized in store-bought reading glasses.
And store-bought reading glasses typically provide little or no protection from blue light.
Custom computer glasses provide a wide, clear view of your digital devices, reduce focusing effort, and offer the added benefit of blue light protection.
Lens designs for computer glasses
There are several types of eyeglass lens designs for computer glasses. Because these lenses are prescribed specifically for computer use, they are not suitable for driving or general purpose wear.
Single vision computer glasses
The simplest computer glasses have lenses with the same power throughout the entire lens. These are called single vision lenses. This lens power is customized for your specific needs and preferred computer viewing distance.
Single vision computer glasses reduce the risk of eye strain, blurred vision and unnatural posture that can cause neck and back pain. They are comfortable for young and older computer users alike.
Progressive computer glasses
Progressive computer lenses are no-line multifocal lenses. They have different powers for your distant, intermediate and near vision needs.
Progressive computer lenses have a larger intermediate zone than regular progressive lenses. This provides a wider view of your computer screen. But these lenses have a smaller zone for distance vision and therefore are not recommended for driving.
Bifocal and trifocal computer glasses
Other lenses used for computer glasses include occupational bifocal and trifocal lenses. These multifocal lenses have larger zones for intermediate and near vision than regular bifocals and trifocals. Also, the position of the intermediate and near zones of these glasses can be customized for computer use.
Lens coatings and tints
For greatest comfort, the lenses of your computer glasses should include anti-reflective coating. Reflections from the front and back surfaces of eyeglass lenses can cause eye strain. Anti-reflective (AR) coating eliminates these annoying reflections.
A blue light filter is another essential to protect your eyes from potentially harmful high-energy blue light emitted by digital devices. Eyezen lenses are example of high quality lenses with built-in blue light filtration for computer glasses.
Your eye doctor might also recommend adding a mild tint to the lenses of your computer glasses to reduce glare from overhead lighting.
Where to buy computer glasses
Resist the temptation to buy cheap, over-the-counter reading glasses for computer use.
Start by having a comprehensive eye exam to rule out vision problems or update your eyeglasses prescription.
Before scheduling your eye exam, measure how far you like to sit from your computer. Measure from the bridge of your nose to the surface of your computer screen.
Bring this measurement with you to your eye exam. It will help your eye doctor determine the best lens power for your computer glasses.
See Also: Do You Need Computer Glasses?
Page published on Wednesday, February 27, 2019