Strong passwords and solid encryption technologies go a long way toward keeping your private work data private. But those tools can’t stop someone from simply peering at your screen from over your shoulder, or worse – snapping a photo of what you’re working on. It’s called visual hacking and it’s a serious security threat that businesses shouldn’t ignore. Thankfully, there’s an easy fix. Simple privacy filters that adhere to a laptop’s display can severely restrict the viewing angle, so that only someone sitting directly in front of the screen can see what’s on it. Anyone trying to sneak a peek from the sides or top will just see a blank, black screen. Privacy filters are surprisingly low-tech, consisting of a polarized plastic sheet. Polarization works as an optical filter that blocks out light from certain angles – in this case, all angles but the one right in front of the screen. It’s the same technology used for polarized sunglasses and some types of camera lenses. The need for a privacy filter will vary depending on the employee’s work habits. Of course, those most at risk of visual hacking use a computer in a public place, or in close proximity to clients or customers. Due...