– Ed

When you work at a computer for any length of time, it is common to experience eyestrain, blurred vision and other symptoms of computer vision syndrome (CVS). Viewing computer-generated print and images on a screen or monitor for prolonged periods is harder on the eyes than viewing a similar amount of material on the printed pages of a book or magazine. If your eyes feel strained after prolonged computer use you should schedule a comprehensive eye exam to determine the cause. If you’re under age forty, blurred vision during computer use may be due to your eyes being unable to remain accurately focused on your screen for sustained periods. Or you may have a hard time quickly and accurately changing focus, such as when you shift your gaze from your monitor to your keyboard and back again. This problem, called lag of accommodation, can cause eyestrain and headaches — two common symptoms of CVS.

If you’re over age forty, the onset of presbyopia (the normal age-related loss of near focusing ability), can make focusing on a computer screen even more difficult, increasing eyestrain, headaches and eye fatigue. Customised computer spectacles can make a world of difference. These special-purpose spectacles are prescribed specifically to reduce eyestrain and give you the most comfortable vision at your computer. Spectacles prescribed for general-purpose wearing are often not well-suited for prolonged computer work.

When working at a computer, your eyes are generally fifty to sixty cms from your computer screen. This distance is considered the intermediate zone of vision — closer than driving (distance) vision, but further away than reading (near) vision.

Without the appropriate eyewear, computer users can often end up with blurred vision, eyestrain, and headaches — the hallmark symptoms of computer vision syndrome (CVS). 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 spectacles. These unnatural postures can lead to headaches, neck and shoulder pain, and backaches.

The simplest computer glasses have single vision lenses with a modified lens power prescribed to give the most comfortable vision at the user’s computer screen. These lenses reduce the amount of focusing the eyes have to do to keep images on the computer screen clear and provide the largest field of view, reducing the need for head tilting and other unnatural posture changes during computer work.

For older computer users, a specially designed occupational multi focal lens for computer use is sometimes a better option. The top part is made to focus at fifty-five cms (screen) while the bottom part is made to focus at forty cms (key board). Spectacles designed for computer use are generally not suitable for distance needs, such as driving.

Digital Devices

These include cell phones, Ipads and laptops. These devices are, as a rule, held much closer than the normal working distance, considered to be forty centimetres. They also emit blue light, which is considered dangerous in high doses over time. There are a number of special purpose lens designs that work well for use with digital devices, such as Hoya’s Sync III and Zeiss’ DigiLens.

Your optometrist can help you decide which lens design will best suit your needs.

Share this on Facebook: