check for space beneath the frame
What kind of glass do you wear? is it prescription glasses or sunglasses? if you wear sunglases , you must make sure there is sufficient space for ventilation. To check for space, put your finger beneath the frame while wearing it. Does the frame contact your face at all? if your finger fit between the frame and your skin then you have enough ventilation.
However, if there the frame come very close contact, glasses style is not suitable for your face. You must choose frame that opens more on the side of your face for ventilation and for space beneath the frame.