That feeling is usually the result of not blinking enough. Whenever you're focused on a screen, or even the pages of a book, your eyes naturally blink less.
Wink Glasses aim to prevent that lack of blinking and keep your peepers in top shape!
When the person wearing these funny-looking goggles takes a blink break that's longer than five seconds, a transparent liquid crystal sensor attached to the frame turns the glass in front of your eyes opaque. You'll be forced to blink naturally. Once you do, the lens clears itself.