Desk. Monday , February 12th , 2018 - 17:54:01 PM
The difference between using some magnification for the computer distance while in your late forties and older, versus not is demonstrated with this simplified example. Given a choice, would you rather walk two miles to work or ride a bike the two miles? You’ll get there either way, but you will spend a lot less energy using the bicycle. This is the reasoning and science behind using a dedicated pair of computer glasses or using a computer clipon lens.
Working at a desk top computer over fifty years of age with your general purpose prescription eyeglasses can be challenging on your eyes. The eye’s focusing ability is under a strain to keep the content on the screen clear. Just because you can see the computer screen clearly through the distant portion of your glasses doesn’t mean you are not taxing the eye’s focusing ability to maintain a sharp focus. Also, lifting your chin up to see through the mid portion of your progressive style lenses will have consequences on your neck and back due to poor ergonomics. The reason you are using a bifocal is to see at close reading distance clearly for extended periods of time.
Your bifocal add power allows your eyes to focus on reading with less accommodative (eye muscle and lens focusing ability) effort and greater comfort for long periods of time more efficiently. A dedicated pair of computer glasses or a computer clip-on will do the same thing for desk top viewing. Otherwise, looking at a PC monitor through the distant portion of your bifocal or progressive lenses is like walking versus riding the bicycle to work example; you my be able to do it but you eyes will get tired sooner. It has always been my belief that when your eyes get tired, so does your body. You now have a choice to beat sleepiness while working at the computer, and re-energize your eyes with better vision and with less physical stress on your posture.
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