Need suggestions of choosing kids eyeglasses!

[glasses store]

What do you care most when buying eyeglasses for your kids? It is really seem to be a tough task to choose a perfect pair, not only because of there are so many models come in different shapes, sizes, and designs or types, but also need to consider the feature of durability, comfort, fitness and so on!So, do you have any suggestions? such as lens material, trend and size?