Question about Strong Meditation Sitting

[Gabith]

I watched Meditation On Steroids, yesterday I did a strong meditation sitting but I did it with my eyes closed and today, after re-watching the video, I heard that he said that we have to keep our eyes open. Now staying an hour still & motionless is one thing but with eyes open, it's another level ! 

I've loosed an eye in an accident years ago and I'm afraid to affect my other eye in a bad way.
I wonder if it's safe to keep our eyes open for one hour or more ? 

For those who did this technique for months/years, does something happened to your eyes ?

[Thought Art]

@Gabith can u blink?

[Gabith]

oh now I realize it's silly of me to think I had to keep my eyes open without blinking lol