This project has a build time of about an hour.
What you'll need:
Pair of glasses. You can generally get some very cheap glasses at your local opticians. The ones I got were about £20. Make sure they have a decent curvature to the lens and are wire framed.
Drill + 2mm bit
Step 1: Dismantle the glasses
2. Remove the lenses. Near the 'hinge' for the arms there will another screw. This one will hold in the lenses. Remove the screws that hold the lenses in. Make sure you don't lose the screw!
3. Remove the nose pads. These can be simply removed by bending the pads back and forth until they break off.
4. File off the arm attachment. The point where the arm attached to the frame needs to be removed otherwise it may scratch your face. File them down to the screws.
5. Cut the nose bridge in half. Once cut, you need to file down the edges to a slight taper. It makes it easier to insert the half-frame into the sunglasses frame.
Leave the lens out of the frame and keep them somewhere safe. Screw the glasses frame back together.