Functions of blind spot

Answer 1

The human eye has defects that are an accident of evolution.

In modern imaging devices, the data is collected by x/y scanning, or from places - behind - the image field. The human eye gathers the data from the -front-, in the direct path of the focused light rays. It is then necessary to take the information gathering nerves through the light sensitive surface to the back and on to the brain. The brain then develops a mask to correct for the errors. Not unlike the fix applied to the Hubble Telescope that had defects because of mis-calibrated instruments used in the grinding of the surfaces.

The "spot" is rather larger than the word implies in relation to the area of the light sensitive surface. Clearly the other eye covers a stereo version of the absent parts of the image and the brain interpolates the two images into one.

Answer 2

The blind spot doesn't actually have a "function" exactly. It's more like a side effect of the way eyes evolved. The light-sensing cells (rods and cones) are at the back of the retina, immersed in a pigment layer. This pigment layer has two major functions: it keeps the rods and cones alive and working, and absorbs any light that wasn't "sensed" by those cells. The former funcion is key; without this pigment, the light sensing cells would die, and you would be blind. Through several other layers of cells, the rods and cones are connected to about 1 000 000 retinal ganglion cells per eye (this is the layer closest to the front of the eye). These million cells have a million axons that need to get to the brain. The most efficient way to do this is to plunge back through the retina. This is what is normally called the optic nerve. Of course, this means there can't be any light sensing cells in that small area of retina, which shows up as the blind spot that doesn't sense any light.

Answer 3

There is one blind spot in each eye. It is the place where all the light receptor connections in the retina leave the eye and form the optic nerve. There are no light receptors right at this spot which is why it is called the blind spot.

Answer 4

The blind spot that is present in your eye represents the portion of the retina which has been disrupted by the optic nerve. In your eye, you have a sheet of photoreceptive cells, normally centered around the fovea (the photoreceptor-rich portion of the eye). However, where the optic nerve attaches to the eye (the optic nerve leads to the brain, and actually developed from neural tissue) there are no cells, and there is a small portion where you cannot actually see.

Answer 5

It is not a function, it is where the optic nerve connect from the eye to the brain. Because of this there are no photo-receptors at that point.

Answer 6

• point on retina were optic nerve meets on retina rod cells and cone cells are absent called blind spot
• here vision is absent.

Answer 7

the retina of each eye has a blind spot, but they are not a problem, because the brain puts the image from each eye together, cancelling out the blind spot of each eye.

Answer 8

It is the point where the optic nerves enter the eye