Chodu - Fifth generation
This little guy followed me all the way to my room. He looks exactly like our hostel dog Chodu
Well, anybody got an idea why the pupils are blue here? If so, please let me know
posted by Shrini at Saturday, July 16, 2005
8 Comments:
Glad to see Jr.Chodu :)
Mithun
i guess the Sr. chodu did a good job, before he was... u know! i m sure this doggy has some special powers in its eyes! :)
lol...abey yeh to seriously Chodu ka baccha lagta hai...prolly this is why chodu ke gote nikal diye... can u guys read the writing on his right paw.. "Mera baap chodu hai"
Dogs, cats, and other animals have re reflective retina (the back of the eye) to help them see better at night. This also means that when you take a picture of them, the flash sometimes reflects back at the camera making it look like their eyes are glowing.
@ golu .. :D:D:D:D:D:D:D:D:D:D:D that was stud
@ Brad .Thanks . I have seen cats' eyes glow in the dark but never a shade of blue. Anyway this looks good.
well i am not sure if this is specific to the animals u mentioned because you get such a glare sometimes when u photograph humans also.....so mebbe it is a thing of the retina as such.... just like if u see all those crystal ball images there is always a glitter somewhere sort of thing!!!
Ok. I can definitely clear this up. It's been a question in Shaastra's How Things Work every year that I was in IITM!
First of all, Brad Biggers is right, and I would like to add to his comment.
The green eye that you see in animals is the same effect as the red eye in flashlit night shots of humans. It looks green in animals because of the extra reflective layer in front of the retina that predators typically use to increase the amount of light falling on their retina for better night vision.
As for why this happens: In the night, or in any kind of low light, the pupil is usually dilated and when the flash fires, it reflects off the retina, lighting up the blood vessels at the back.
The red eye reduction used by all cameras fires a dummy flash just before opening the shutter, so that the pupil can quickly adjust to the increased light and constrict in time for the second flash that accompanies the exposure. Now, since the pupil is actually smaller, less light enters the eye and less is reflected off the retina.
Rahul.
Thank u Rahul for clearing that up. I knew that it was the same as red eye in human photography, but didn't know the reason for the eyes becming blue/green
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