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View Full Version : Why we have blind spots, and cool trick to see the blood vessels inside your own eye


joboo
28th July 2012, 06:56 PM
Turns out the inside of the human eye is essentially backwards which is why we have a blind spot. So much for intelligent design.

How to see the vascalature inside your eye by simply using your hand @6:18


https://www.youtube.com/watch?feature=player_embedded&v=L_W-IXqoxHA#!
https://www.youtube.com/watch?feature=player_embedded&v=L_W-IXqoxHA#!
Horn
28th July 2012, 07:11 PM
I see them now, at first I thought it was the hairs on my middle finger. :)
joboo
28th July 2012, 07:25 PM
I see them now, at first I thought it was the hairs on my middle finger. :)

His part 2 on how, and why, we can see white blood cells using blue light is also interesting.


https://www.youtube.com/watch?feature=player_embedded&v=FkUwogWzSwk

I actually thought I had hundreds of parasites swimming around in my eyes once while using a counterfeit bill testing light (bright blue light).

I've since noticed the same phenomena while suntanning.
Horn
28th July 2012, 07:50 PM
Maybe the reason for the reversal of vessel over receptor is in the first cellular fetus stage?

Either that or better to dream with... :)
joboo
28th July 2012, 07:58 PM
Was just reading it could have to do with UV light protection. A circumstance underwater creatures never really have to deal with.

Perhaps an interesting argument for evolution....the underwater "ideally" designed eye climbs out of the ocean, and has to pull a 180 design wise to avoid getting burnt out by UV light. Only trade off is the blind spot.
Horn
28th July 2012, 08:04 PM
Was just reading it could have to do with UV light protection. A circumstance underwater creatures never really have to deal with.

Perhaps an interesting argument for evolution....the underwater "ideally" designed eye climbs out of the ocean, and has to pull a 180 design wise to avoid getting burnt out by UV light. Only trade off is the blind spot.

Strange, right so the first in/out vertebrates were like a Tool gif all the time. Interesting stuff.

http://images.coolchaser.com/themes/t/589644-i728.photobucket.com-albums-ww290-babyluna68-Tool_Eye.gif