Eye Care Blog

I must admit to really liking computers. There is no doubt about it, personal computers have made my work much faster and more efficient. I’d never be able to move back to a manual typewriter or adding machine.

But even though I enjoy computers, I still seem to notice some niggling little resistance to increasing the time I have to spend on them. Although it makes a lot of sense to convert more and more printed material into computer files, I would hate to give up reading a printed copy of the morning newspaper. I also would have a hard time giving up the pleasurable experience of snuggling up on the sofa with a good book or magazine. Sometimes I wonder if this is just my own knee-jerk reaction to moving into the high-tech age, but I think that the truth is that it is just not as relaxing working on the computer as it is reading a printed page. This is especially apparent when I am ready to do a final read-through on the computer — I give up and print out a copy which I can read in a more comfortable and leisurely setting.

Generally speaking, optometrists have reported that workers who use video display units (VDUs) have more visual focusing complaints than those viewing printed material, and the complaints increase as the workers spend more hours at the computer. What are the most common problems that people complain about?

• blurred vision
• colour perception changes
• discomfort with prescription glasses
• double vision
• eye focusing problems
• eyestrain
• headaches
• irritated eyes
• short-sightedness.

The indirect symptoms include:

• back, neck, shoulder or arm pain
• irritability
• increased nervousness
• lowered visual efficiency.

Do any of these problems reflect your own experiences? I’ve definitely noticed some of these symptoms in myself.

Computer use is very demanding on our visual abilities.The eye could not focus on the video terminal with the same accuracy as the printed page. Over a period of hours the computer user’s focus point relaxed and extended beyond the screen, causing the screen to appear less clear and harder to read. Optometrists have found that a few computer users overfocus, which means they are focusing at a point in front of the screen so the image they see is not clear. Other computer users experience a breakdown of eye coordination skills which causes them to see double images after working on the computer for long periods of time. If an individual lacks the visual skill to see the image easily on a computer screen, he may begin to tense his body and move his head in an attempt to focus better. This may lead to posture- related pains in the neck, shoulders or back. Because workers are not aware of ways to reduce computer-induced visual stress, they may make begin to experience job burnout, high absenteeism or visual problems such as short-sightedness or eyestrain.

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