Can anyone point me to the best resources which might help me understand how visually impaired users navigate the internet today?

The impetus for thinking about it today was looking at a maps subreddit, and seeing how much fun people were having. The contents of the map images in the sub are very complex with lots of text data on the maps. I would imagine that blind, or near blind users, could not participate in the fun.

I started to make a Custom GPT [0] to try to deal with this. The end goal being an iOS shortcut where a user could send an image to it, and get the GPT's text response.

Am I re-inventing the wheel here? Am I even coming at the problem correctly?

[0] https://chat.openai.com/g/g-jcyEz5uDP-image-descriptions-for-the-blind