When you look at a 3D TV, why do you need 3d glasses?

Question: When you look at a 3D TV, why do you need 3d glasses?
- Keywords:
  3d tv,
  glasses
Asked by Achsu to Betty, Isaac, Kieran, Silvia, Will on 11 Nov 2016. This question was also asked by TerryT.
- Isaac Llorens answered on 11 Nov 2016:
  
  When you look at 3D TV you are actually watching the same image twice. That is why it looks blurry without glasses. The glasses make your eyes see the two images separately which tricks your brain and make yo feel you are seeing something in 3D.

SharkyWarky commented on 12 Nov 2016:

Do you think there will be a 3d TV in the future where you wont need 3d glasses?
that guy who is weird commented on 15 Nov 2016:

wow that’s cool I never new thx Isaac

Question: When you look at a 3D TV, why do you need 3d glasses?