I was thinking about cats today and how they are pretty close to the ground, relatively speaking. And somewhere I read, or heard, that their range of effective sight is about 125 feet. Of course I can't find that fact on the net anywhere..but that never stopped me before. Now if we consider the mole...the mole is very shortsighted, although I can't seem to find anything about their effective sight distance either. Stupid internet. Anyway, moles live below the ground most of the time. Eagles. Now eagles can fly up to 10,00 feet, according to the net. At 1,000 feet they can spot a rabbit 3 miles away, that's 15,840 feet away. If we take all this into consideration we can reasonably conclude that gravity has an effect on vision. And I haven't even mentioned the earthworm. In other words, the further you can distance yourself from the center of the Earth, the better your vision will be, evolutionary wise. So now, if we extrapolate all this data into the human realm, we can ask, "Can tall people see better than short ones?" Throwing out the disputed claims of 11' 6" and 9' 3", we find the tallest human was Robert Wadlow at 8' 11.1". Here he is hanging with some chicks; I know, he's wearing glasses, but I have two theories about that. Either he was wearing them as a disguise so people wouldn't bother him so much, you know, "Hey aren't you that tall dude? Can I have your autograph?" OR he needed them to tone down his sight, reverse glasses, if you will. He could probably see into the next county and didn't like what was going on over there, hence backward glasses. The shortest human was Lucia Zarate at 20". Here she is: Obviously she needed major optics because I can't see her that well. So in conclusion tallness is related to eyesight and gravity stops us from becoming too tall and thereby seeing everything clearly. I have noticed that it is easier to grow horizontally than vertically and I believe this is also related to gravity as the food we eat tends to topple over in our stomachs instead of remaining stacked one upon the other as we eat. Which would make us taller if it did. This fact compounded with the lack of clear vision, say below 7 feet of tallness, leads us to have weak, instead of clear vision, and the combination of the two is why there are so many fat people.
Interesting theory but hyperplasia can sometimes affect eyesight as well as stimulate the pituitary gland which caused Rob’s excessive height Hotwater
Eagles possess the ability to switch between monocular and binocular vision. They spot movement from very far away by looking with one eye. When they swoop down close, they switch to using both eyes, giving them the depth perception necessary for an accurate kill.
Most of the 7 foot + NBA players happen to be much worse free throw shooters than many of the smaller NBA players. Free throws are something that many non-NBA players can be adept at. I think eyesight has more to do with evolutionary wiring in a species, which gravity certainly may play a role in, then it has to do with the individual variation of height among the same species.
Hyperplasia is merely an increase in cells. If they increase upward you get taller, if they increase outward you get fatter. This is why other people's vision is affected, not yours. They see that you are getting taller or fatter.
this is a pretty seriously flawed argument. i assure you that it is not scientifically sound i do not believe that the gravity affects vision, but if it somehow DID, the differences in distance from the center of the earth between a 9 foot tall person and a 2 foot tall person are negligible. elephants have moderate vision, and they are taller than us. here's a cool link even though it's not exactly what the thread is about http://webecoist.momtastic.com/2009/01/14/animal-vision-color-detection-and-color-blindness/
That's what they said to Newton and the guy that invented the Super Ball. But there are always scoffers and nay sayers. Here's the proof: Dynamic Vision: Vision Therapy Through The Anti-Gravity System I didn't bother to read it, but I'm sure it supports my thesis. But...just to be fair: Spaceflight Bad for Astronauts' Vision, Study Suggests I believe this was not due to a lack of gravity but in fact the increased gravatorial pressure exerted during the tremendous acceleration of lift off compounded with the massive vibration and shaking of the head as exhibited by Tom Hanks in the movie Apollo 13. That would flatten anybodies eyeballs and also shake a few synapses looses from the old pituitary gland in the process.
correlation is not equal to causation also you are not taking into account the ones you site as having exceptional eyesight are carnivores and must hunt to survive.
I'm kinda confused. But I agree I want some of what the OP was smoking. Um.... I'm 5'11'' w bad far away vision but perfect up-close vision. Don't think that proves anything though? Idk...idk...
I doubt it proves anything. The most logical response to this thread as far as I'm concerned is; Vision depends on the animals that need it. A hawk needs good vision, a mole really doesn't.
Probably depends on what foods they consume and or predators they have to watch out for. Moles don't need to look that far ahead. There is no selective pressure for long distance sight. Birds however are far from the ground part of the time and need good vision to see their food. Good eyesight afforded the ancestors of modern birds an advantage in finding food. Cows don't hunt anything that moves and don't need good vision to see grass a few feet from their eyes. Their eyes are designed to see farther to the sides of their bodies to spot predators. I believe their eyes are move sensitive to movement also, not sure about that thoufh.
its not gravity. the higher you are the more you can see .. its more of a geometry type thing. obviously some species have better eyes if great vision is necessary for their survival. moles dont need good vision to survive so theres nothing stopping moles with shitty vision from surviving and passing on genetic traits. survival of the fittest
serious answer: it probably is somewhat evolutionary; eagles that can see for miles are more likely to see food down on the ground somewhere while moles that can see for miles can basically see dirt really clearly. hipforums answer: that 20 inch girl is like the cutest thing ever, and i want one.