zd: It’s definitely better than looking in a Smartphone while walking.
In any case, it’s not dangerous to walk down the sidewalk without glasses on even if you are very nearsighted. You might just want to make sure to put them back on before you cross the street, but I don’t know if it’s necessary. I am extremely nearsighted, but I can see a CAR. There have been periods of time in my life when my glasses broke and I had to manage w/o glasses temporarily. It was extremely difficult and inconvenient but not dangerous.