Why is an object not seen when the light from it falls on the blind spot of the eye?

Answer 1

The human eye has a blind spot in its field of vision. This lies on the point of the retina where the optic nerve leads back into the brain. The retina has no light-sensitive rods or cones at this point, and so a small object in the field of vision's blind spot becomes invisible.

In order to find the blind spot of the right eye, it is necessary to close the left eye, focus the right eye on a single point, and see if anything vanishes from vision some 20 degrees right of this point. The following diagram has a set of characters on the left hand side, and black circle on the right. Keeping your head motionless, with the right eye about 3 or 4 times as far from the page as the length of the red line, look at each character in turn, until the black circle vanishes.

With increasing age, the blind spot enlarges. You may find that the black circle disappears when several of the characters are looked at. The size and shape of the blind spot can be found if a large enough grid of characters is used.

The same test can be done for the left eye. Close the right eye, and look at each character until the black circle disappears.

more:
http://ourworld.compuserve.com/homepages/cuius/idle/percept/blindspot.htm

Answer 2

2

Answer 3

The blind spot is where the nerves from the eye attach to send signals to the brain. No receptor cells there.

Answer 4

the blind is the spot on the retina where there are no cells with light receptors.
No light is detected on that blind spot because of the absense of light sensitive cells, thats why we can't see

Answer 5

why did you say dat? everyone knows that blind man can't see right? the object we can't see because the image falls at the spot we can't detect the object.

Answer 6

Because its a Blind Spot !!!!

You seem to have one in ur head - no wonder u dont get this !!