[ExI] what big eyes you have
dan_ust at yahoo.com
Thu Jul 12 17:44:43 UTC 2012
You would do better to compare human to other primate eyes. But one noticeable feature of human eyes is that there are whites. This appears to evolved under pressure of socialization. It's easier for humans to tell who other humans are looking at.
From: spike <spike66 at att.net>
To: 'ExI chat list' <extropy-chat at lists.extropy.org>
Sent: Thursday, July 12, 2012 11:27 AM
Subject: [ExI] what big eyes you have
Why do big beasts have big eyes? I get why small beasts have small eyes (packaging considerations) but human eyes are about the size of a ping pong ball and they seem to work fine; they can see close, they can see far. Eagles have smaller eyeballs than ours, but they work even better. So why don’t elephants and cows have ping pong ball sized eyes? I can’t think of any advantage to eyeballs scaling with the size of the beast, but I can think of some serious disadvantages, such as they would be more easily injured and would be more affected by gravity. Granted an elephant with little beady human eyes would look weird, but we would get used to it. So why didn’t evolution think of it by now?
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