Is it bad for your eyes to write your homework in a red book?

Yes, it's a big red notebook. The resolution of writing black words or blue words on it is relatively low, which is easy to cause visual fatigue. Pink paper is relatively better, but it is not as easy to read as white paper. The best way to read is virgin pulp paper, which is slightly yellow, not as reflective as white paper, and it is not difficult to identify because of its multi-color and dark color. In a sense, it can relieve visual fatigue. However, you still need to read for a while and have a rest, which is easy to relieve.