My experience has been that Therevada usually recommends eyes shut, and Tibetan often eyes open, or half way open. not really focused in front of you.
18 years ago I made one of the most important decisions of my life and entered a local Cambodian Buddhist Temple as a temple boy and, for only 3 weeks, an actual Therevada Buddhist monk. I am not a scholar, great meditator, or authority on Buddhism, but Buddhism is something I love from the Bottom of my heart. It has taught me sobriety, morality, peace, and very importantly that my suffering is optional, and doesn't have to run my life. I hope to give back what little I can to the Buddhist community, sincerely former monk John
I usually begin with open eyes and then close them after 5-15 minutes dependent on when it feels "right" to do so. I am doing anapanasati (a modified Ajahn Lee version) with the air touching the nostrils as main focus point and find it helpful to glance towards the nosetip in the initial fase - and also later on in the session, if dullness should arise, it can help to open the eyes a bit - just enough to make out the contour of the nose - for a few moments. Sometimes - likewise depenent on wether it feels right - I may keep the eyes partly open for more than those few moments.
A useful side-benefit of being used to meditate with open eyes is that one can actually do "cushion-practice" at places where closing ones eyes isn't quite appropiate.