Digital Eye Stress
 

The digital world is tough on the eyes and we all know it. Most of us are spending well over half of our day looking at computer screens. Common temporary symptoms include eyestrain and fatigue, blurred or double vision, headaches, dry eyes and inability to concentrate. Studies implicate that long term consequences from computer use can result in permanent damage to the eyes. Increase in the rate of nearsightedness among young adults, and the correlation of screen’s blue light exposure with retinal damage, are reasons we need to be cautious with computer use.

Why is the computer so hard on the eyes?
Viewing a computer is harder for the eyes than viewing a printed page because the eye reacts to borders. The more contrast there is at the edge of a letter, the easier it is to see. Pixilated letters on a screen are naturally brightest in the center and fade at the edges, the opposite of what the eye prefers. The eye tries to compensate for it by constantly adjusting focus, which fatigues the eyes.

What is a Blue Light filter and why do you need it?
All LED lights including monitors, tablets and smart phones emit more blue light than other light sources. There is increasing evidence that this excessive exposure to certain wavelengths (415-455nm) in the blue light spectrum can have a cumulative damaging effect on the retina. Specifically, it increases the risk of damage similar to macular degeneration. Lenses and lens coatings have been developed that can decrease our exposure and protect our eyes.

Why does my distance vision get blurry after I have been on the computer?
The focusing of the eye is done by muscles inside the eye, just like any other muscle if you work it too much it will either fatigue and not focus or it may become tense and start over focusing. When it over focuses, the distance vision may diminish.

What is the correct ergonomics for me at work?
The computer should be arm’s length away if possible. When you are looking straight ahead, you should see the top of the monitor. Studies show that it takes less energy to focus when you are looking down slightly rather than straight ahead and we blink more completely. Be sure to have good posture and your feet flat on the floor.

Why do my eyes get dry?
Our eyes get dry when we concentrate on something such as the computer screen. Studies show our blink rate drops to about 1/3 of the normal rate. Basically we forget to blink. Besides that our blink is less complete than normal so it is less effective in spreading our tears.

Are there ways to minimize my discomfort?
For the working world, there are a few easy ways to help improve one’s comfort while on the computer.

1. Keep the monitor at arm’s length. The closer it is the more effort the eyes must exert to perform the task.
2. Where you look at the monitor should be at shoulder height, not eye level.
3. Take breaks! Every 20 minutes, look at something 20 feet away for 20 seconds. Called the 20/20/20 rule. This gives the eye muscles a chance to relax and get rid of some of the lactic acid buildup.
4. Remember to blink. When you are following the 20/20/20 rule remember to blink to rewet the eyes during the break. Use lubricating drops if needed.
5. Minimize the effects of blue light exposure by adjusting the monitor’s light setting or use glasses that filter out the excess blue wavelength
6. Computer glasses can help minimize the strain by doing some of the focusing for you. Sometimes a prism is indicated to relieve symptoms. This prescription is different than your everyday glasses. We can prescribe you computer glasses here at Dr. C Optometry.

Are computers hurting my children’s eyes?
Children can have the same symptoms as adults but they don’t usually complain because as parents, we would take away the device. It is important that we monitor their digital use both for content and for the time they are on it. Studies are showing that over the past 10 years, the rate of nearsightedness in the college age group has almost doubled. One cause theorized is the increase in the amount of time spent on digital devices. More long term studies need to be done to prove this theory.