Out of curiosity what font sizes do you use for your editor? I have a 27" 4K monitor around 20" from my face and find it too small without scaling, 1.5-1.75x is around perfect for me (although support for that under Windows and Linux is hit or miss).
In Sublime for Windows, I am using the default font with a size of 10.5. I have always tended to use higher dpi screens on laptops (i.e. 1680 and 1080 @ 15" running at 1:1) so I have years of conditioning to small text on screens.
An added piece of information - I got presbyopia (in addition to my existing myopia and astigmatism) about 5 or so years ago, so I now use reading glasses, which also helps a little.
I had a special pair of single vision glasses prescribed to me from my optometrist where its optimal range of focus is between 21" and 27". I got those distances from measuring the closest and furthest points between my eyes and monitors. I see everything fine. Before I got the single vision glasses, I was using a flip up reading glass attachment that I wore over my normal progressives to see the screen, which a - looked goofy, b - was unwieldy, and c - not as good as the single vision glasses.
I had a colleague who did the same. Size 10 on a 27" 1440p monitor. Whenever I had to pair with him I always had to ask him to increase the font size.
I also have myopia and astigmatism, but if I use a smaller font eventually my eyes get tired and I get headaches. My optician suggested I wear slightly weaker than my prescription glasses for computer work which helped a bit, but still I find it more comfortable to stick to my size 14 at 1.75x scaling :-)
