Personally, moving my eyes to look directly at every note is uncomfortable for my eyes and I also end up losing track of other notes if the spacing is too big. I generally move my eyes to the general movement of the notes so that the note I need to hit is still pretty close to where i'm directly looking at, and the following notes are more visible in my peripheral vision so I have a better idea of where they are before I need to start moving to them. It also strains my eyes less.
A very visible and clear cursor is also good if you do this so that you can more easily see if you're actually moving the cursor where you want to, despite not looking directly at it.
Though, in some cases I do look directly at notes if I feel like i need to.
Idk, might not be the best way to do it, but it works for me.
Also I lowered my resolution to 1280x720 from 1920x1080, which makes the game appear smaller, which brings notes closer to my direct line of vision.