Depth of Field?

[eliasfrost]

Depth of Field emulates a focus point on a point object within a distance in depth while blurring all other objects (amount of blur depending on the distance in depth from the point object), thus producing a sense of depth to the picture/movie/game. And just like everyone already said, your eyes can't produce this effect itself on a flat screen, because there is no point object on screen, but the whole monitor is the point object.

I'm not sure what the name is of the effect you're describing, but it's not depth of field.