3D glasses are not singular, and there are also many different kinds in the market with quite a large price difference. However, among the current 3D glasses, red-blue glasses can be considered the most popular.
The popularity of this type of glasses is largely related to the price. Nowadays, we mostly use 3D glasses in the cinema to watch 3D movies, and may not use them much during regular times. Therefore, if the price of a pair of 3D glasses is too high, it would be relatively difficult to accept. Red-blue glasses are considered to be the most cost-effective type of 3D glasses, with prices possibly less than 100 yuan.
For instance, the red-blue glasses on AiDai.com, branded as "YiShiJie", costs only 35 yuan. It can be said to be very affordable.
Red-blue glasses are also stylish in appearance.