That is funny to ask a doctor for the make of sunglasses with cardboard, anyway, it is very interesting and it remind me about the childish story and lots of fun. I guess we can imagine the shape of the sunglasses then start. The structure of glasses is two circles with two legs, as well as a bridge between the two circles. We can draw all the shapes of them with pencil on the cardboard, and then start to cut it into our needed shape pieces of parts. Finally, we can form them together with glue. After that, painted some colorful coating or tiny decorations on that, the stylish and smart sunglasses are ready, that is easy! At last, I would like to recommend you not mount the lenses on it, because no needs, it used just for fun, and poor quality lenses will do harm to your kid's eyes and the cardboard material is too fragile to contain such lenses. Ok, just for your reference!
