+1. :D
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Precisely :p
No, that's exactly the same (kind of) study and it has nothing more to do with reality than the other one. You are taking a statistical average of a group. I suppose it is better in that it relies less on the concious opinions of the test subject. But nothing about this implies it is that way "because of nature". I bet if you tested a seven year old, their eyes would miss on shorter than average lines because they are not as used to reading.
I still think this is a mental, developmental trait and not a fixed, physical one.
Great word.