Why should you wear sunglasses ?

The objects named glass and glasses in English can have different shapes and uses, can't they? Take a look at the pictures below . Pick and choose some of them to comment about at the bottom of this post, ok?

http://www.macmillandictionary.com/dictionary/british/glasses 

Did you know the word "shades" is a synonym of "sunglasses"? Click on the link above to check definitions and pronunciations of these nouns.Then answer these questions: What is the difference between sunglasses and dark glasses?  Why do many celebrities wear dark glasses when they go out? Do you remember any other word that can also be used when you refer to" glasses"? It starts with " s" and its last letter is "s" too.

By the way,if you click on the first link below, you are going to read about Eight Reasons Why People Should Often Wear Glasses. Have you ever read about The smart E Glass, the Toshiba,Sony ,Apple Iglass and Google Glasses? Would you like to wear one of them?Which is the best one?

Click on the second link below to read information about these modern specs and then you can write a few words about them at the bottom of this post,can't you?

https://pt.slideshare.net/solareyesonline/8-reasons-you-should-be-wearing-sunglasses

http://blog.softgridcomputers.com/now-smart-digital-glasses-what-made-apple-iglass-better-than-google-glass/

Last but not least,look at the photo below .Why are they wearing those glasses and looking up? 

http://www.instyle.com/news/melania-donald-trump-solar-eclipse-glasses