I'm just wondering about those times when I'm in the middle of something, then it's like I wake up about (out of day dream), then I realise that my eyes have 'maybe' become out of focus?

(I guess I wouldn't really know 'how' out of focus my eyes look, since 'are we able to view our own eyes!')

As a kind of science/psychology type question, any views on how this comes about? I guess the related terms are: daydreaming, eyes glazing over...any more?

So, what happens here, is the brain only able to concentrate for so long, then the eyes switch off their focus while the brain rests?

I'm interested in other peoples' views :-) :-)!