If I cross my eyes, or press on one eyeball, I see double. This is explained by

If I cross my eyes, or press on one eyeball, I see double. This is explained by

If I cross my eyes, or press on one eyeball, I see double. This is explained by saying that we have two optical images, one on each retina, and they are normally coincident, whereas they are not coincident when pressing on one eyeball. I am now crossing my eyes and I see two computer monitors. Which is the real monitor: the one on the left, or the one on the right?

Read another response by Richard Heck
Read another response about Perception
Print