Funny. I thought that's how bright on dark text looked for everyone. Couldn't see the shadow until I tilted the screen.

Do I have diplopia or do people with diplopia see more of the effect?

I just switched back and forth from vi in my terminal to that image a couple of times. I see the blurring on that image immediately, every time. I don't see anything like that on the terminal.

As a person with an eye condition that also makes things look like that (and worse), it took me a while to see what's wrong with this image.