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I have been thinking about this on and off, clsee to quantitative analysis but quite there yet. Qualitatively I have come to a few conclusions.
1. Parallax (distance between target image and reticle) changes sight picture. When the shooter's eye deviates from the optics' axis, it appears as POA off the target. If the shooter's eye is coaxial to the optics, there is no error, other than the blurriness of the target image.
2. The changes in sight picture becomes more noticeable with increased parallax.
3. Parallax has upper bound for distant target. It is theoretically boundless for close target.
4. The change in sight picture prompts the shooter to "correct" his aim erroneously, so as to cause error in poi. However error in poi is independent of the amount of parallax. But rather it depends on how much his eye is off axis.
-TL
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