Who can tell me what this classic figure is demonstrating? This is a lead in to a much more involved post that I am working on for next week.
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Relative size of the eyes to overall body size of a pipunculid fly?
But as that would be a trifle esoteric, I’m guessing it has something to do with the amount of sensory input from a compound eye compared to our own eyes.
http://coo.fieldofscience.com
Good guess, but that’s not it.
At a guess I would say the size required for a compound eye to achieve the same visual performance as a human eye.
Total shot in the dark, though.
Yep, that’s it. In order for a compound eye to have the same resolution as a human’s camera eye, it would need to be a meter in diameter. In hexagonal facet actually represents 1000 individual facets.
This seems like a pretty damning trait of compound eyes, so why are they so successful?
“They have at least eight different type of cell involved in colour vision (compared to the human three), including several sensitive to ultraviolet wavelengths (to which humans are blind). In addition, they are able to sense and use minute information about the direction of light – known as its ‘polarization’”
http://www.bbc.co.uk/nature/blueplanet/factfiles/crustaceans/mantis_shrimp_bg.shtml
I know I cheated…
Sorry…
But, it is fascinating…
I’ll go get my coat…
http://www.lucycarty.com
That was mantis shrimp specific btw…
http://www.lucycarty.com
Those characteristics have more to do with the structure and sensitivity of the photoreceptors. I am referring to the optical structure of the compound eye in a general sense.
Am so out of my depth. Will check out your post next week though…
http://www.lucycarty.com
Good question.
Thinking about it compound eyes tend to be found on small animals, and if I remember my high school physics, the resolution of a single lens depends on its’ radius. I would guess that a small animal would be incapable of supporting a single lens capable of producing a useful image and the use of multiple smaller lenses gets around the problem.
Also I suspect that it takes less energy to produce a workable compound eye than a camera eye, probably not worth the investment when many arthropods are so short lived.
And, of course, when evolution makes a ‘decision’ it’s hard to go back!
Wilf
smoke more pot?
He is a banker looking for people, so he can compound his assets? Hungry eyes?
http://www.youtube.com/1156511
If the human’s eyes relative to the size of their body were the same ratio of an insect’s [compound] eyes to their body, the human’s eyes would be equal to 1 meter in proportion to his body?
http://www.youtube.com/1156511
Who is this figure by?
http://pentatomid.blogspot.com
Not sure about the artist (E.F.), but I think this was in one of the “Animal Eyes” books. Not sure at the moment, I’m in the field and don’t have access to all my references.
Here is the original reference for that figure:
Kirschfeld K (1976) The resolution of lens and compound eyes. Neural Principles of
Vision, eds Zettler F, Weiler R (Springer, New York), pp 356–370.