Now that I'm spending more time in classrooms than the newsroom, I often face students displaying a peculiar kind of bifocal gaze divided between the front of the room and the laptop screen. (dotearth.blogs.nytimes.com)
There are eyes with mirrors, eyes with optical fibres, and eyes with bifocal lenses. (discovermagazine.com)
Benjamin Franklin is credited with inventing bifocal glasses. (discovermagazine.com)