If you make your browser window half width, or increase your text size, you may find it's easier to read. When I'm awake and focused, I can read smaller text across longer lines without problems. When I'm more tired, I need to increase the text size, bring the screen closer, make window widths smaller.
You may also benefit from getting your vision checked. This may be early stages of something occurring, and the sooner it's identified the better.
There's other cognitive issues here. I find reading from the screen difficult, CRT, LED, OLED, but I'm fine given e-ink. Any web pages with text more than a paragraph or so is sent to an e-reader for me, otherwise I just cannot comprehend the content. I can cope with snippets.
You may also benefit from getting your vision checked. This may be early stages of something occurring, and the sooner it's identified the better.