Whether we open our eyes or close our eyes when we meditate is not important; what is important is that awareness gets better.
If awareness is better when you close your eyes, then close your eyes; if awareness is better when you open your eyes, then open your eyes.
Awareness needs to be better.
There are lots of problems when a yogi closes his eyes – easy to be sleepy, easy to day dream, easy for imagination to set in.
If you open your eyes, you can be more alert and aware; and also you can practice seeing. When you close your eyes, you have no chance to practice seeing.