Several years ago, I was going to join my old club again for the winter. I played a doubles match indoors (same place I played fine for 15+ years) ... and it was so bad I didn't even join. I was always use to the first week transition period
@tlm mentioned, but this was different. I couldn't track the ball good enough to enjoy it. Give me outdoors and sunshine and I'm seeing great. One of my eye docs says it's because outside the pupil size reduces ... and the focusing doesn't get filtered through as much of your eye imperfections. When the pupil expands ... say you have astigmatism or other imperfections, now the focusing involves a wider portion of the front of your eye. No doubt there are other reasons also. I live with some pretty large floaters ... which I manage fine outside. I always figure they bother me more indoors. The other thing the eye doc mentioned is our lens (cataract) starts to cloud ... and that makes artificial light sources harder.
In my late 20s and early 30s ... I always struggled indoors. The worse was return of serve. Then at 34 ... had Lasik ... and showed up at indoor season a different player. Man... did that feel good to be able to see return of serve. Had a friend that also did Lasik ... and it was also the return of serve where it showed up the most.
You are WAY to young for that now. Just wait until you are as old as tlm ... says the guy who will be 60 in Feb.