At CES, Nanoveu showed off a version of its nanotech filter for the iPad that lets you see images and video in 3D without special glasses. The Singapore-based company already offers an Eyefly 3D filter for the iPhone, now it’s adding the iPad Air to the mix. Eyefly3D doesn’t automatically make everything you watch on the iPad glasses-free 3D, that would be truly remarkable, though the company says it’s not hard to convert content to 3D.