Take a quick look at a pro gamer’s mouse and you’d think it came from another planet. Every button and every curve is designed for comfort and ease of use. In fact, each of the seven models in the catalog of gaming manufacturer Razer is shaped to address a varying grip type for the palm, claw, or fingertip style of play.

According to Levi Harrison, M.D., an orthopedic surgeon, pro gamers obsess over such things, fretting over a mouse’s “clickiness,” the drag of the rubber cord, and the polling rates of the laser.

That’s what you do not only if you want to win but also if you want to remain healthy. When you spend 12 to 18 hours a day using the devices pro gamers use, says Harrison, you’re prone to tendinitis, varicose veins, and lower back and eye problems.

And yet, the average American, who logs roughly 10 hours of screen time per day, according to a 2016 Nielsen Company report, rarely stops to think about ergonomics when purchasing a computer.

If you'd like to make a more informed decision before buying your next laptop, here are some things to consider.

Take It for a Test Drive

While it’s tempting to shop online for the sake of deals and convenience, don’t purchase a computer until you’ve had a chance to get some hands-on experience with it. Our testers sit with each laptop that passes through our labs to examine the ergonomics of various features.

We consider the dimensions and spacing of the keyboard's keys, how readable the letters are, and how much the keys depress. We look at the length and width of the touchpad and how easy it is to scroll and use multitouch gestures with it. We even draw spirals with it to see how accurate the input is.

But hand size and typing and scrolling style differ from person to person, so while our ratings can help you narrow your choices, it’s smart to spend time in a store with each contender.

Look for a comfortable keyboard layout. Someone with larger hands, for instance, might want to steer clear of budget Chromebooks and laptops smaller than 12 inches, because they often have cramped keyboards and small trackpads.

Consider the Ideal Use

“If you use a laptop at a desk with an external keyboard, mouse, and monitor, then you can position each part independently in its ideal location,” says Consumer Reports tester Antonette Asedillo.

But if you travel a lot for work, you're going to want a laptop that's lightweight and easy to carry. You might also need to raise it above the desk or adjust the display to reduce strain on your neck and wrists.

Harrison suggests taking the time to find the right mouse, as well; one that’s too small forces you to grip it tightly or twist your hand into uncomfortable positions.

Listen to Your Body

Ergonomic keyboards and mice are not a silver-bullet solution. It's often not the design of these tools that creates a problem, but rather the fact that we overuse them.

To avoid trouble, says Consumer Reports medical director Orly Avitzur, M.D., listen closely to what your body is telling you. Those joints, muscles and nerves are not designed for 24/7 abuse, so if you feel numbness, tingling, pain, or discomfort—during or after computer use—take a 5-minute break every hour.

She also recommends using a voice-recognition app to reduce the need for typing, particularly for people who have suffered nerve damage. Don't wait until you need treatment—medical or surgical—to take action, though, she explains. It's better to prevent such injuries before they become chronic.

Many people point to computer use as the reason for carpal tunnel syndrome, which can also result in numbness and tingling in the wrists. But the cause-and-effect is far less clear-cut.

“Everyone wants to believe they have a malignant keyboard, but the evidence, such as it is, just doesn't suggest that,” says Michael Hausman, M.D., the chief of hand and elbow surgery at Icahn School of Medicine in New York City's Mount Sinai Hospital. “There have been large-scale studies involving thousands of people and carpal tunnel syndrome really doesn’t seem to be related to typing or any other activity.”

It’s more likely due to a genetic predisposition, he explains. However, cases do exist where the patient's family had no prior history with the disorder.