Why do glasses hang out

Glasses are used to prevent the discomfort in the eye. Some people are far away and some can not see the relatives, for this, the glasses are added to the glasses. Logic, these glasses are the lens.

Sunglasses are used to prevent bright solar lights.

Glasses are also used as accessories, especially to look more beautiful and charismatic, especially the sunglasses are installed. Some people want to look smarter and more intellectual using flat glass glasses without numbers.