Even as few as two hours daily on a device can cause eye problems, says Dr. Steven Reed, an optometrist and president of the AOA. Unmanaged screen use can lead to issues including dry eye, eye strain, back and neck pain, headaches, heavy eyelids, tearing and blurred vision. Modify brightness to a comfortable level depending on surrounding lighting and increase contrast on your device to reduce glare. Getting glasses that block blue light and reflective light, which are available for prescription and non-prescription lenses, can be an effective option for some people to prevent eye strain, too, eye doctors say. "If you're on your screen until bedtime and then you don't really sleep well, that impacts your overall health significantly," he says.

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Persons: Steven Reed, Unplugging, Reed, Valerie Sheety Organizations: American Optometric Association, Deloitte Economics