Why You Should See an Eye Doctor Regularly - Even If You Think Your Vision Is Great

Even if you’re not squinting to see the clock, it doesn’t mean your eyes are in the clear: Many people have vision problems and don’t even know it, a new study published in Optometry and Vision Science suggests.

The researchers found that 58 percent of people with no known vision symptoms when they went in for a routine eye exam actually had at least one significant change noted by their eye doctor.

In the majority of the cases, the diagnoses were relatively minor, like the need for glasses or contacts or an updated prescription for their eye gear.

Still, walking around with an outdated prescription isn’t exactly harmless: You’re more likely to experience eyestrain, headache, and dizziness, according to lead researcher Elizabeth Irving, Ph.D., professor of optometry and vision science at the University of Waterloo.

Hats Don't Protect You from the Sun as Well as You May Think

It’s that time of the year again—hats have officially transitioned from a fashion statement to a weapon in the war against UV rays. But do they really offer much in the way of protection from the sun’s damaging effects?

A little bit—but definitely not enough for you to forgo using SPF on your face and any exposed areas of your body. "Wearing a hat provides instant shade, which increases your cumulative total sun protection factor by at least 10,” says Ava Shamban, M.D., a dermatologist in Beverly Hills. "Regardless of whether [or not] you wear a hat, you need to apply a sunscreen of at least SPF 30 because ultraviolet light is reflected off of surfaces." Remember to stick to this rule: Apply about a shot glass worth of SPF to your entire body, and reapply every two hours.

4 Things You Think Turn Her On—That Don't

Your girlfriend's libido

  doesn't just have an on/off switch. She requires a slow build—which means there's plenty of time for mistakes. And no matter how well you think you know her hot buttons, there's a good chance a few moves in your repertoire are actually squelching her sex drive. "Men often assume women are turned on by the same things they are," says Brandy Engler, Ph.D., a Los Angeles-based sex therapist and author of The Men on My Couch. That's your first misstep—and unfortunately, it can lead to many more.  

Sex and Sports: A Better Combo Than You Think

By Laura Schwecherl for Greatist.com

Muhammad Ali always abstained before hitting the ring. Even Plato said Olympic athletes should avoid sex before competition. But science suggests doing the deed won’t actually zap all that energy or be a distraction during the kick-off. In fact, an orgasm may help combat muscle pain for ladies, while a testosterone boost could even help build strength for men. (As if the act itself wasn’t reason to take part!)