And yet if you sit in front of a screen for long stretches (who among us doesn't these days?), you're almost certain to experience some level of eyestrain.

Desktops and laptops aren't the only culprits, either; tablet and smartphone screens can prove hazardous to your eye health as well.

So, how can you keep your peepers safe? Start by consulting the Vision Council's 16-page guide: (It's a PDF that should open right in your browser.)

The guide provides a wealth information on causes of the problem (including how it can be exacerbated for people with existing vision problems), symptoms of digital eyestrain (everything from simple eye fatigue to back pain and headaches!), and who's most at risk (women, it turns out).

You have to skip all the way to page 11 to find remedies, but it's a motherlode of useful suggestions. For example: