For the duration of the microsaccade, you're blind. So if something changes onscreen it's much harder to see.

IIRC people have used small orientation changes during microsaccades for redirected walking in VR. You feel like you're walking straight but you're actually curving back on yourself.

Edit: I think that was just detecting full-on saccades but a microsaccade version would be smoother and harder to detect.

Source: https://blog.siggraph.org/2018/05/challenge-accepted-infinit...

They’re looking to be increasingly more interesting as a biomarker for MS among other things [0]. There’s a lot we still don’t know about our visual systems and the advent of lower cost hardware is allowing huge amount of interesting questions to be hypothesized and tested. It’s a great time to be in the science behind all of this, like the authors at Brown on this paper!

[0] https://iovs.arvojournals.org/article.aspx?articleid=2670267