You had had following experience:
In the night with black tall wind of a month, when your person returns a village, discover not far from you ahead suddenly, a black shadow is being ticked off continuously tick off the ground to staring at you to look, motionless.
And you right now the heart also arose to fear one tiny bit, draw out skill machine rapidly, opened flashlight with the rapiddest rate, as a result the light of a multicoloured forces continuously your eye, the 2 dogs that are your home so will receive you to come home!
Or be, get up in the middle of the night on toilet, confused you opened mobile phone flashlight to omit report, the result just got out of bed to with respect to discovery a few bundles of green or yellow show the light that shines suddenly to coming over to you suddenly. In the night of chilly, let you frighten an a suit cold sweat on the spot.
Also or be, taking your home dog in the evening greatly child enjoy a have fun, look at a dog child lovely about, skill machine is drawn out since one fashionable " Ka Ka " took a few pieces of pictures (take flashlight oneself) . The result opens a photograph to look, dog child sending out in the eye dazzling ray, but be forced to delete give u.
These state look above be like a meeting to appear inside the film, but really true however in the life that produces in each officials that shovel excrement on the spot, and this culprit is yourself raises big dog. . . . . .
So the issue came, why can the eye of dog dog give off light?
The answer with this the most immediate problem is: The presence of eye ministry structure of the mankind and dog dog is very large difference, so this difference is in, the answer depends on retina.
Because retina is put in two kinds of special sensitive cells, one kind calls awl shape the cell, one kind calls staff state the cell. Former it is photopic vision organ, use by day namely; Latter calls scotopic vision sensitive organ, use in the evening namely.
As a result of staff state cell abound in, so dog dog can take a large number of lights in night. When these lights enter dog small hole, can project through retina on iris, reflex retina again after that, formed this kind of special glow appearance so.
So, can person eye give off light?
In human eye, the amount of staff state cell that is in charge of the action below dark condition is not much, so night inspects ability opposite for weaker also, give off light more impossibly in that way like dog dog.
Do not live staff state cell abound in, defect also was carried to them while dog giving a dog takes night to inspect " achromatopsia " . Can differentiate only because of staff state cell the light, do not have action to colour.
After the reason that makes clear eye of Hunan dog dog gives out mysterious light, feel immediately and do not have so terrible ~~
Origin: Bagatelle of pet a bit
