how do blind spots work?
144103
At the back of your eye there is a collection of cells called the retina that are sensitive to light.  They cover the majority of the back half of the eye, except for an area called the "blind spot".  This is the point at which all the nerves that carry information from the retina out of the eyes and towards the brain.  Because this area is dense with nerves there are no photosensitive cells.\n\nIt is important to note that you cannot sense your blind spot directly, ie. you do no have a black hole in the field of vision.  This is for two reasons.  First, the area in your blind spot for one eye is clearly visible by your other eye.  This way the blind spots never overlap as long as both your eyes are open.  Second, after the nerves leave the eyes they enter a part of your brain that processes the information.  At this point your brain "fills" in the blind spot so it is not noticeable to you!
22128
This is different than what is normally called the "blind spot".  That is a spot off to the side of your vision where all of the optic nerve enters the eyeball.  A good demonstration of the blind spot can be found in the link below.  You can even cut & paste the demo into paint and change the color of the spot to see how color affects it.\n\nWhat you're experiencing is a more subtle phenomenon.  Cones (think ice cream cone) sense color, while rods (think magician's rod) sense only black and white.  Rods are don't work well in bright light, but work very well in low light situations such as when all the lights are turned off, but there is still light from an outside street lamp.  OTOH, cones work well in bright light, but stop working almost completely in low light.  \n\nAnother aspect of this is that cones only cover central vision, whereas rods cover the entire retina.  There are also fewer rods in the central vision.\n\nSo.  You are in a dark room or on a dark street.  The light from the computer screen/car ahead of you knock out the rods in your central vision but not the peripheral vision.  Then the light goes out and the cones stop working while the central rods haven't gotten started yet, but the peripheral vision is still working well.  So you can see things out of the corner of your eye but it disappears when you look straight at it.  Boo!  It must be a ghost!
546324
This a question I answered once!\n\n1. Blind born people aren't able to visualize because the visual area is not developped\n2. People that blind during their life ... is possible if visual area is intact ... ask someone in this category ...
460962
Assuming they are completely blind, it's like having no eyes at all, in which case they would "see" nothingness.  Blackness would indicate an ability for your eyes to pick up at least some form of light, and completely blind people can't pick up any forms of light at all.
871683
bats still use their eyes to see!! They use echolocation to find the precise location of prey...but they use eyes as well.  It may be albe to know where a bug is by the echolocation and then fly to that spot to get it...but would still need to see with it's eyes to grab it.  Bats are not constantly sending out signals...they use their eyes to see the rest of the time.  They send out the signals when they want to feed.  So, if you blindfolded a bat, it would crash into something, and most likely die.
477984
The blind spot is a part that you are unable to see, ie:  parts that are outside your peripheral vision.\n\nNegative feedback can mean many things depending on what subject the question is from.
470655
BLind Persons use bumps called Braille. \nDeaf People learn to read by visual cues
0
Optical mice use an LED and a camera to rapidly capture images of the surface beneath the mouse.  The infomation from the camera is analyzed by a DSP (Digital Signal Processor) and used to detect imperfections in the underlying surface and determine motion. Some materials, such as glass, mirrors or other very shiny, uniform surfaces interfere with the ability of the DSP to accurately analyze the surface beneath the mouse.  \nSince glass is transparent and very uniform, the mouse is unable to pick up enough imperfections in the underlying surface to determine motion.  Mirrored surfaces are also a problem, since they constantly reflect back the same image, causing the DSP not to recognize motion properly. When the system is unable to see surface changes associated with movement, the mouse will not work properly.
56416
Fly eyes work like fantastic motion dectectors. Their sight system is completely different for a very different reason. Detecting motion not specific visual acuity
445171
if you are nearsightedness this sight will probably help you.\n\n\n\n\n\nreversingnearsightedness.com
1023954
the idea is the same as why trainers shine a light into a football players eyes after he suffers a big hit.  If you've truly been 'knocked out' your eyes become unfocused to point of not reacting to bright lights.  If you squint or blink at the light then you really haven't truly had your bell rung.
947530
Does wearing glasses make you blind?
863959
see: http://en.wikipedia.org/wiki/Color_vision\nhttp://en.wikipedia.org/wiki/Color_blindness
1131908
Most people would take them off, they just get in the way. You'd have to have incredible crap eyesight to not be able to see what you're doing.
137090
Well, I dont think it can make you go blind, BUT it does put strain on your eyes. It is recommended that if you are going to be on the computer for a long amount of time, to take a break every 15 minutes just to look away from the screen and allow your eyes to focus on something in the distance.
883235
If you are looking into someones' eye thrugh an opthmaloscope you see through the cornea, through the pupil and lens, through the vitreous gel and see the retina. You can see the capilaries and bleeding and scarring . you can see where the optic nerve leaves.You can detect cataracts.\nYou do not see individual rods and cones,
626942
intersting question; i think a blind person will affect the way they see in their dream.  \n\nFor example, i always dream and i can control what i do.  But if i have a pair of blind eyes, as i said before i can control what i do, i am sure i will not be able to see in colour during a dream.