Going theory is that the ciliary body in your eyes can not only curve the lens (for close-up) but also flatten it, when needed, for distance.
The lens should be flat when the ciliary muscle is relaxed, but … well the biology is still not 100% understood, and apparently the muscle can compensate in both directions.
This is what we think causes the generally weakened vision later in the day when you added a lot more distance time than you normally have.
The fix for this, is slowly ramping up to more consistent distance time, as well as checking eye chart for ciliary spasm from close-up. By slowly addressing any over close-up use with more breaks, and adding distance gradually, you should stop having that particular issue with decreased acuity.
Yes indoor sports is great. Following a rapidly flying ball while also being physically active is about as good as it gets!