... Introduction Every eye has a blind spot .The blind spot is the hole in the retinal wall where the nerve ganglia pass though. This area of the retina contains no photoreceptors and therefore creates a black spot in every person's vision. The gap created by the blind spot is approximately 6 degrees of the total visual field, which is a large area, relatively speaking. We do not see this area in our normal functioning because our brain has a mechanism for "filling in" the missing information. The information that would normally be received by the blind spot is projected onto the other eye and the brain essentially "averages" the image (Lou and Chen, 2003). The blind spot in physical structure and given the normal variances in human physiology, it would be expected that there would be little variation in the blind spot from person to person. However, there are certain ...

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