I'm curious to why it's a problem. I have a astigmatism, but with glasses I have better than 20/20 vision and have zero issue with light-on-dark. Without glasse

I'm curious to why it's a problem. I have a astigmatism, but with glasses I have better than 20/20 vision and have zero issue with light-on-dark. Without glasses light-on-dark and dark-on-light alike are a problem to read.