Good for you if you can do that. Some people can. But the eye cups are there to make using the binocular easier. I'm not being officious in criticizing the actor in the video for not making that clear. He's making a video of a binocular that he is reviewing and rating and he should do it right.
Look at the comments he made about his credentials at the end of the article after the video. He really knew better.
Surprisingly lots of people do not know about this feature on binoculars. There is nothing complex about it but it is often overlooked or forgotten and it is mentioned in a sentence or two with the instructions you get with new binoculars.
I ran into a couple at Cape May Point last year on the observation deck. The husband was a physician and had just purchased a new Canon 10x42 IS. Wonderful binocular! He let me use it a bit. He wore glasses and used it with the eye cups down and he was thrilled with it! He said his wife didn't like it. She couldn't see much with it he said. I watched her trying to use it and I noticed that she did not wear glasses and was trying to use it with the eye cups down. I showed them how to set the eye cups for their own use and she turned into a happy camper.
Years earlier I had loaned my Yosemite 6x30 to my brother and showed him how to use the eye cups. I visited him a couple of weeks later and asked him how he liked the binocular and he said they were good but he had to keep moving them in and out to see his backyard birds properly. I had to point out to him that he had forgotten to extend the eye cups and that fixed everything for him.
Incidentally, if you think this is a minor issue scroll down to the Vortex Forum below where there is a newly reactivated thread inquiring how one can extend the eye cups on a binocular.
http://www.birdforum.net/showthread.php?p=3004973#post3004973
PS: I forgot the real reason why I commented on how the binoculars were being used!
Go back to the video and look at the guys using it. Notice that the eye cups are in the completely closed position and notice that they are also pressed flush against the users eyebrows. Try that and see if it works for you. My guess is you will see blackouts all around the perimeter of the view and your eyelashes will be up against the eyepieces.
