This is topic Eyes of the night. in forum Predator forum at The New Huntmastersbbs!.


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Posted by onecoyote (Member # 129) on April 15, 2003, 09:41 AM:
 
I have a question I hope someone can answer. All the years I've been hunting at night I have seen most of the animals that can be seen. One thing all animals have in common at night (to my knowledge) is their eyes glow or reflect light except one and that would be humans. Why is it that human eyes don't reflect light? [Confused] I'd sure like to know, Good Hunting.
 
Posted by Leonard (Member # 2) on April 15, 2003, 04:20 PM:
 
Danny, they do, a little bit.

But, I'm surprised that Frank didn't tell you about kangaroos. Gerald Stewart is the one that told me that he shot one, when he was in Australia, and they don't reflect, at all.

Besides, don't you remember that little episode with (edit) one of our clubs? (edit) one member, shot a soldier right in the face. (edit) unfortunate, but he got away with it, completely. A weird deal, they weren't supposed to be out there, but still, it was a major screw up. As you know; the light man (I'm sure you know him, too) should have made an ID, if (edit) the shooter couldn't tell a man from a coyote?

The Army hushed it up; big time. I'm not sure if the soldier died, or not? I don't think they know, either?

In any case, my opinion of both of those guys (edit) changed somewhat, after I heard all the details. (edit) Carelessness, no excuse; right?

Good Hunting. LB

[ May 01, 2003, 08:18 AM: Message edited by: Leonard ]
 
Posted by onecoyote (Member # 129) on April 15, 2003, 05:10 PM:
 
Leonard, yes I heard all about that story. I can't believe (edit) anyone could do such a thing, not just one, (edit) but two. [Mad] The story I heard was the soldier was using binoculars, they thought it was a set off eyes and shot him DUH???? [Confused] I also heard the soldier didn't die (thank God) but had his lower jaw blown off, lucky that predator hunter was a bad shot. They fixed the soldier back up so the story goes. Those two boys are real lucky, I think the Army didn't want anyone to know they were doing there thing on public land and I'm sure it was secert stuff......Frank shot a kangaroo when he was in Australia, as I recall he told me the same thing but I had forgot about it, [Roll Eyes] Good Hunting.

[ May 01, 2003, 08:21 AM: Message edited by: Leonard ]
 
Posted by Leonard (Member # 2) on April 15, 2003, 05:41 PM:
 
Actually, I believe (edit) ***** told me that in his opinion, it was a drug interdiction operation, along the border, California side? LB

[ May 01, 2003, 08:22 AM: Message edited by: Leonard ]
 
Posted by onecoyote (Member # 129) on April 15, 2003, 05:52 PM:
 
Somehow I don't believe that guys opinion. Remember it was his opinion that those eyes belong to some type of varmint? [Confused]

(sentence deleted)

[Roll Eyes] (NOW YOU KNOW THE REAL STORY) Paul Harvey LOL. [Big Grin]

[ May 01, 2003, 10:51 AM: Message edited by: Leonard ]
 
Posted by Curt2u (Member # 74) on April 16, 2003, 06:45 AM:
 
I think it is because humans lack a reflective layer behind the retina that dogs and cats have. That sound right? Don't know where I read that. Might have been posted years ago by one of you night hunting fellas. Dunno. [Big Grin]
 
Posted by onecoyote (Member # 129) on April 16, 2003, 07:25 AM:
 
Curt2u, thank you for your answer and that sounds good to me. [Smile] I have no idea why human eyes don't reflect light at night tell now and I'm one of them night hunters you're talking about, [Roll Eyes] [Wink] Good Hunting.
 
Posted by Leonard (Member # 2) on April 16, 2003, 03:06 PM:
 
Okay then, what causes that "red eye" in photographs taken with a flash? LB
 
Posted by Cdog911 (Member # 7) on April 16, 2003, 04:15 PM:
 
I got this one. From Mammalogy, Second edition, by Terry Vaughan of N. Arizona Univ., "The eyes of mammals resemble that of most amniote vertebrates. In most nocturnal mammals, the tapetum lucidum is well developed. This is a reflective structure within the choroid that improves night vision by reflecting light back to the retina." Note: nocturnal mammals only. As so often debated, the physiological structure of the human eye/ retina is not consistent with night vision because of the lack of rods/ abundance of cones.

As far as red eye, this is caused when a picture is taken of a person with relatively dilated pupils and the flash of the camera reveals the blood vessels running through the retina inside the eyeball.
 
Posted by onecoyote (Member # 129) on April 18, 2003, 10:20 AM:
 
Cdog911, thank you very much, but I don't have a clue what you said? [Confused] [Frown] LOL, but I got the idea I think, [Wink] Good Hunting.
 
Posted by Cdog911 (Member # 7) on April 18, 2003, 10:50 AM:
 
Danny, Think of the tapetum lucidum as a shiny foil covering over the entire muscle we know as the iris. In a nocturnal mammal such as a coyote, bobcat, deer, whatever, light enters the pupil and lands on the retina. That light bounces off the retina and is redirected back out away from the retinal surface. It strikes the inside of the tapetum lucidum and is reflected back toward the retina. This happens time and again over the span of a micro-super-nanosecond (a very short time frame)until the light being reflected back and forth is all but none at all. In effect, the animal sees multiple images of the same object perfectly superimposed over one another, and with each image, the amount of brightness is enhanced. The reflection you see when you shine that same animal's eyes is the light that strikes the iris around the pupil, where it strikes the OUTER surface of the tapetum lucidum and is reflected back one time - to you. Hopefully, this makes it a little more clear. Animal physiology is a truly incredible area of study, especially predators. I recall the first time I skinned out the feet of a bobcat for taxidermy. The mechanical structure of each retractile claw is a work of art.
 




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