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A Demonstration of the Blind Spot

By , black-rose-bielefeld.de GuideApril 23, 2012

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At the back of your eye is a tiny spot where the optic nerve leaves and approximately one million ganglion cells extend out of the eye. In order to allow the cells to leave the eye, there is a very small spot that lacks visual receptors. Because of this gap in the receptors, we have what is known as a blind spot.

Usually, we are completely unaware of this blind spot. Why? Partly because it is located slightly off to the side of our visual field, an area where objects lack sharp focus. Our brains also "fill in" the missing information, allowing us to see without gaps in our vision.

While you don't normally notice the blind spot, there is a quick and easy demonstration can allow you to experience this phenomenon. Click the following link and follow the instructions for completing the blind spot demonstration.

Image by ZStardust/Wikimedia Commons

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