QR codes can be used for website links, coupons, tickets, and contact information, just to name a few, and scanning them using your iPhone or iPad is completely accessible for blind and low vision iOS users.
Apple has built QR code recognition directly into its camera app, which means all you need to do is open it up and point it at the code in question. Remember to have some lighting for scanning the QR code.
You’ll get a notification appear on screen once your iOS device recognizes what it’s looking at (which generally takes less than a couple of seconds), promoting you to action the link the QR code points to, a quick tap on this and you’ll be taken to the desired location, usually within the Safari web browser.