Some people, including me, have what's commonly called ‘astigmatic halation’ — although it's often not due to simple astigmatism, but rather ‘higher order abberrations’‡ which aren't correctable by glasses.
For this case, dark text on a light background is much better than light on dark. Dark on light, the light halation blends more or less evenly over the dark letter stems, resulting is slightly lower overall contrast but sharp lines. Light on dark, it's Las Vegas in the rain.
oh ive never heard of aberrations? it sounds like i might have it as i get weird shadows and stuff that i cannot put into exact words whenever i try to read black background white text! i will have to talk to my optician thank you
You can find some images on line that try to describe it. For me it seems a lot like this: https://www.threads.net/@mrmedina/post/CuciL0Uvam9 (But I have to remember that when I look at these, I'm stacking my own vision on top.)
For this case, dark text on a light background is much better than light on dark. Dark on light, the light halation blends more or less evenly over the dark letter stems, resulting is slightly lower overall contrast but sharp lines. Light on dark, it's Las Vegas in the rain.
‡ https://www.allaboutvision.com/conditions/aberrations/