Here's an interesting site I found:

http://www.clarkvision.com/imagedetail/eye-resolution.html

Here's some interesting points: 

- 74 megapixels to show detail at the limits of human visual acuity

- The eye is not a single frame snapshot camera. It is more like a video stream

- 576 megapixels - the full angle of human vision would require even more megapixels. This kind of image detail requires a large format camera to record.

- Its estimated that the dark adapted eye is to be about ISO 800

- The eye can see over a 10,000 range in contrast detection, but it depends on the scene brightness, with the range decreasing with lower contrast targets

- The range of the human eye is greater than any film or consumer digital camera.

- Aperture for human eye is f/3.5 when dark adapted

- Maximum aperture of 7mm, this implies about a 25mm focal length

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