I am having a problem doing this focus afar thing..can I focus before the screen?
It is rare when focusing much closer (getting cross-eyed) renders any image - it blurs the image too much. But I think focusing afar is not as difficult as you have made it for yourself.
Here's how you test the validity of this phenomenon:
It is a simple exercise - Put your finger on top edge of the screen - outer edge so as not to smudge the screen.
Now look at the edge where your finger is touching the screen - keep looking at the edge, and not at the finger.
Then very slowly (not too slowly or people might get different ideas) move your finger closer to your eyes - between them, while your focus is still on that edge of the screen. You will notice two images of the finger instead of one. You will begin to feel, may be, a slight but not-so-annoying ache in your eyes.
Here's how you cheat on the 'far focus' problem:
Keep an object a feet or two behind the screen. Focus on that object and slowly move your eyes closer to the screen - but with your focus still on that object 2 feet behind the screen. When you are about just 6 inches away from the screen and your eyes looking at the object appearing near the edge of the screen, you will notice the screen too has two images for you - just like your finger did.
Now you have to try and move your eyes slowly to the screen without changing the focal length of your eyes - so while your eyes are still focused 2 feet away from the screen, you are trying to stare at the object through the screen.
But there's this (3d) image on the screen - along with the screen that too will have two images for your eyes because you are still not focusing on the picture, rather on some object 2 feet behind.
Stay like that for about a minute and DO NOT try to focus at some specific point in the picture.
If, even after this elaborate method you are not able to see it... I would suggest you to get checked for color blindness. That can keep you from getting the 3d image because it involves the positions of the distinct colors to turn that image into 3d.
P.S. I am presuming both your eyes are working fine, and that you are not a pirate.