How do you mean "hard time reading"? Attention span problem, comprehension issues or lack of interest in reading?

Your reaction to reading is just an emotional response. You need to get over the fact that you don't like to read and do it. Eventually it will come naturally to you. That's one of the things that I learned from a CSCI professor when I was in school. Don't be concerned about your emotional response when you face a large coding problem, or any kind of difficulties. You can do it and you will if you really want it enough.

> Your reaction to reading is just an emotional response

That's certainly one claim, but on the other hand we have about a dozen decades of actual neurological research that doesn't agree with it.

Then what is it? Please help me understand this research that proves my statement incorrect.

Is it reading the code that is a problem or reading the documentation?

Change your IDE theme (dark background), change the font size, use syntax highlighting.