It is easy question. Because there are so many people wear and spread nerd glasses, they are popular. On other hands, the eyeglasses are look great so they can attract many people. Personally, Nerd glasses are not stylish but popular. With it, it may not make you amazing suddenly, but make you always stay in good look. For girl, with nerd glasses, it can make them look smart and graceful.
Different people hold different views about the kind of glasses you said. Some people think that such kind of glasses can make them look smart as well as learned, which will attract more people. On the other hand, some people do look good on this kind of glasses than on other styles. Glasses are just like clothes that every style have their own distinguishing feature. Go to some online stores where have a lot of different glasses, and you may find them special. Some stores are offering free glasses for those who had never bought glasses online or who are new customers. Try: firmoo or coast.com.
Black nerd glasses are so popular with many people these days because they become one of the most fashionable glasses in recent years. People with stylish nerd glasses do look fashionable. nerd glasses with big frames make people outstanding among many people, so people want to draw people's attention will choose to wear nerd glasses. People who are suitable for nerd glasses will be better-looking because nerd glasses can boast their image.
I think its because its popularity makes it popular. On one hand, stylish nerd glasses make people look extra outstanding and fashionable. On the other hand, with the spread from other people, more and more people especially teenagers start wearing this kind of glasses to make themselves involved in the trend.