[johnwalkr]

When I got an ultra wide monitor I also noticed this for the first time on the macOS circular red X button, when wearing glasses. I guess a wide monitor has you looking at things off-axis more. It is really remarkable how much you can make the X dance around the red circle by moving your head. There's something about the colours and simplicity of that particular icon that really cause the effect. The effect is almost non-existent if you're looking at a more complex image, so I guess it's also remarkable how much your brain compensates for chromatic aberration in most contexts.