You can test this by looking at your hand 6” from your face so it partially blocks your keyboard a couple feet away. You’ll notice that either the keys are blurry or your hand is as you shift focus between the two.
Future gen headsets will use eye tracking to understand which object in a scene you are looking at, and make that object sharp while making other objects blurry. This helps produce more realistic depth, while also dramatically improving performance as most of the scene can be rendered in lower resolution.