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When looking into a clear blue sky, no cloud, birds, trees or any object to give a frame of reference. When a person is actively looking, as opposed to day dreaming or gazing.

The sky goes for a long distance, and with uninterrupted view, and I guess the first question would be: - At what point into the atmosphere can the human eye see (which is not a topic for this site), following this,

What I want to know; is at what point to the eyes come to rest and How is the focal point determined?

Another consideration is:

How can this be measured?
Would any attempt to measure this would involve putting a device between the eyes and focal point?

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I can provide some details to answer the question about how far into the atmosphere we can see, if required. –  user3543 Nov 14 '13 at 2:24
    
Possible overlap with photo.SE? :) –  Steven Jeuris Nov 14 '13 at 8:31
    
@StevenJeuris to find a person's focal point? –  user3543 Nov 14 '13 at 8:32

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