On the day of this event I was at the hospital and everyone just used X-ray films. They work well enough. I also did try a pair of sunglasses, and I could last maybe for a second or two. I am not sure if my eye sights have been damaged since then. I hope not... I repeated a few times but all done around 1pm-ish in NY, so not at peak. It was more like looking directly at the sun during noon everyday.