"I’d want them to know that 295 million people in the world have moderate-to-severe visual impairment, and 43 million are blind. This total is roughly equivalent to the entire population of the United States."
https://www.publicsource.org/pittsburgh-blind-braille-americans-disabilities-act-squirrel-hill/
@freemo Just used DuckDuckGo.
Moderate visual impairment
Visual acuity: 20/70 to 20/160
Severe visual impairment
Visual acuity: 20/200 to 20/400 and/or
Visual field: 20 degrees or less
https://www.allaboutvision.com/conditions/lowvision/visual-impairment/