It's not that your eyesight is bad, but that society is changing. In the eighties and nineties of last century, the stalls were all genuine, and you could find things with your eyes closed. As long as you dare to buy, there are plenty of opportunities to pick up the plane. People who play antiques miss that era, and people are relatively pure, and there are not many intrigues, digging holes and burying mines.
With the passage of time, it is difficult to pick up antiques, especially those on the street stalls. It's really important to buy big goods at low prices while the economy is weak. The time has come when cash is king.
Now is the Internet era, and new platforms are beginning to appear, such as "Playing with Things to Make an APP", which has a link of identification.