What is Proofreading?

If you ask someone what proofreaders do, they’ll probably tell you they check the spelling, punctuation, and grammar in a document. And they’re not wrong! That is part of the proofreader’s job, but there’s so much more.
How to be a Proofreader – Training for a Brain Marathon

The proofreading process requires you to read each line slowly and carefully, with awareness of pattern, focusing on what is in front of you, but holding the whole in mind.