Once in a while something of great simplicity and usefulness comes up. This is probably one of those gadgets where you wonder why nobody thought about it sooner.

Mobi-Lens is something that you can probably understand its usefulness without much explanation. But of course it still brings about the point of carrying a set of such lenses on a daily basis.
This project is found on Kickstarter and the team behind this add-on is seeking funds for a production run.