Hey Farkel, I almost always kept my eyes open during prayers, especially the last few years, for any of the following reasons, depending on my mood at the moment:
1) To remain steady on my feet
2) To remain focused on the words being spoken, because with eyes closed, my mind wanders
3) To secretly show disdain either for the one praying or for what he was saying
Prayer at the meetings was the worst part of the meetings.