Another thing which must always be considered when buying cheap rx sunglasses online is the shape and design of the glasses. These days there are plenty of designs available. You can buy sunglasses in rectangular, round, square or other different shapes. And the styles available in glasses include sporty, classic, aviator, retro etc. The important thing here is to remember that what might suit one person might not suit another. So you should always look at your own face, the unique shape that your face has, the unique facial features that you have and the unique style that you have. Once you consider all these things, you will be able to choose the glasses that suit you.