Using the 20-20-20 rule can help prevent eye strain when looking at screens. For every 20 minutes a person looks at a screen, they should look at something 20 feet away for 20 seconds. Following the ...

Although the 20-20-20 rule may sound like a very simple practice, its benefits aren’t so simple. Over time, this routine can enhance focus and may even help slow the progression of myopia, especially ...

Lindsey Ellefson is Lifehacker’s Features Editor. She currently covers study and productivity hacks, as well as household and digital decluttering, and oversees the freelancers on the sex and ...