To watch the total solar eclipse, you should wear professional glasses. Yongkang brand and Shidu brand solar eclipse glasses use lenses of the same quality. Because the price of Yongkang brand solar eclipse glasses is low, when you buy Yongkang brand rather than Shidu brand solar eclipse glasses, you can buy glasses with the same viewing effect at a lower price.
The premise of the above conclusion is that the price of eclipse glasses mainly depends on the price of lenses.