Eli5 why do people have Aphantasia?

Question

I recently got told that people are actually able to visualise images in their head, something which I cannot do, which brought me to the condition of Aphantasia.

Why is this something that I cannot do?

In: 31

Answer 1

I found out i have aphantasia in my 40s. It explains a lot of things that i never understood like counting sheep. But i don’t see it as a big problem, probably because i never had it another way. I guess losing the ability due to some circumstances could be hard.