I just do believe that sunglasses is for fashion that will add more beauty to people,it makes one look more attractive and adorable when properly dressed.
(Source)[https://unsplash.com/photos/sUzcTuM_Jy0]
For people of old age I know that glasses should be worn especially when trying to read or view something very far.
Not too long I noticed that there's medicated glasses for young people who can't see clearly due to short sight and in same way I get to know and understand that the glasses people put on are of different purpose based on functions that is when you visit any eye healthcare center you find them based on quality and age numbered that depends on eye lens.
At the other side, using sunglasses is very defensive and prominent to use in order to protect the eye against mechanical injury most especially the okada men and taxi driver even passerby due to invisible particles like dust as you know,at workshop it serves as google apparatus for eye defence especially the welders in other to extend their eyes lifespan.
The niggas have their own special design sunglasses they put on that comprise variety of color and I assure you that all are for defensive reason while some for forensic.
I thought the glasses I put on is just for fashion until I narrowly escape that kind of insect that fly at night there is reflection of light if only you ever walk at night you will get to know what I mean.