Meditation is ultimately, as the Tibetan Dzogchen yogi Longchenpa described, no more than resting in natural awareness.
The object of natural, or nondual Buddhist meditation is to explore what happens when you have no object. But even if your object is to get rid of objects there is no meditation.
Meditation has nothing to do with whether your eyes are open or closed. If you want, try both and notice the difference. The main difference is that, with your eyes open, you can see.
You can meditate in either state equally.
Here are some more teachings to help you with your meditation.