Why can’t we see in the dark?

Answer 1

We see by light reflecting off or being absorbed and re-emitted by objects. The light enters our eyes and causes a reaction in the back of our eye. This triggers a nerve impulse to be transmitted to the optical centre of our brain.

So no light an the whole process doesn't work

Answer 2

We can see in the dark. What we see has little to do with the light around us. What we see and how well we see it depends primarily on the amount of light emitted or reflected by the object we are looking at. It makes little difference whether we ourselves are in a light or a dark environment, other than the fact that in the daytime there is so much light reflected off objects and surfaces around us that our eyes "close down" much like the lens on a camera adjusts to give proper exposure based the average amount of light emitted or reflected from all the illuminated objects seen by the lens.

We can see the light emitted from a flashlight pointed at us or the light emitted by distant stars much better at night than we can during the day because we have no extraneous light to deal with at night. The light emitted from the sun, however, can be seen very well (too well in fact if we look directly at it) during the day because it has a much greater intensity than that of a flashlight and it is a lot closer than the stars. Similarly, we can see the light reflected off the moon and objects illuminated by a flashlight during the day, but we can see them much better at night when our eyes do not have to adjust for the extraneous light reflected off other objects within our range of vision.

Answer 3

Well, first of all, we can see in the dark, but not as well as we can in the light. There are two types of photoreceptors in the eye. Cones are photoreceptors that need thousands of photons in order to "activate" them. The cones in our eyes allow us to see in color and are used whenever it is light. The other type of photoreceptor is a Rod. Rods are many times more sensitive to light photons than cones, and can even respond to a single photon of light. Rods make night vision possible. However, without the cones activated, we no longer can see in color which is why everything is in black and white after your eyes adjust to a very dark room.

Answer 4

Most animals cannot see well in the dark, some have massive eyes that capture as much light as possible such as owls, others have other ways of navigating around such as wiskers, scent and very good hearing in cats and rodents, sensory glands that pick up the heat or energy of another animal such as in snakes.

Our best sense is our sight, our hearing and smell are extremely poor compared to nocturnal animals.

Answer 5

Our eyes need ligh to see.
What happens is that if a room is lighted, the things in that room reflect the light falling on them which enter our eyes.
The senses in our eyes convert it into brain messages.
So when light os not there, the messages in form of reflected light is not there at all
BEST OF LUCK!!!

Answer 6

because we dont have an addtional reflective structure(tapetum) which reflects the the light back to the retina thereby increasing the amount of light reaching the rods in the eyes

Answer 7

because the rays in the light react with the chemicals in different objects and the chemical reaction is picked up on by the eye,so no light = no reaction = no sight,that's why cheap paint and dye soon fades,its chemicals run out.

Answer 8

Because some one turned the light out, or you may be suffering from a serious carrot deficiency.

Answer 9

You must have a vitamin deficiency because I can see in the dark.

Answer 10

we gave up night vision earlier in our evolution in favour of colour vision. animals who have night vision, i don't think have colour vision. You see, earlier in our evolution, a couple of million years ago, we started to be active during the day, rather than during the night. it was during the night when we slept (which we still do, obviously). due to this, we no longer needed night vision, and we developed colour vision. this helped us to define between different food and such. for example, one coloured fruit could be poisonous while another may not be. colour vision would be helpful in knowing which is which.