I saw a documentary on Medjagorge, which had similar miracles. A research team filmed the children and the children’s eyes went to the exact same spot at a millionth of a second. I believe in these miracles.
Consider that the devil also is capable of preternatural display. Medjugorje and Garabandal are notorious for this...not approved apparitions...many suspicious circumstances concerning the motives of the seers and actions of the seers. Also discrepancies in Mary’s words compared to the real apparitions: Fatima, Lourdes, Akita, etc. Do some research (tv documentaries on Medjugorje and Garabandal tend to be extremely non critical). I reserve some small possibility these were authentic, but very little.