I don\u2019t get a lot of email from readers, but my favorite ones are usually of the \u201cI don\u2019t get this\u201d variety. Don\u2019t get me wrong. I\u2019m not trying to intentionally confuse people, but occasionally an idea comes to me that I know will solicit those emails. And it kind of makes me happy knowing that people will be heading to Google to figure out what the heck I\u2019m talking about. This is one of those. About diplopia. Wikipedia describes it as \u201c\u2026 commonly known as double vision, [and] is the simultaneous perception of two images of a single object that may be displaced horizontally, vertically, diagonally (i.e., both vertically and horizontally), or rotationally in relation to each other." So there you go. Now when people email me I can just direct them here.