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What do you mean by the term blind spot

What do you mean by the term blind spot? Briefly illustrate it.

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Axons of the ganglion cells pass via the eye ball at posterior end form the optic nerve that enters in the cranial cavity. Thus this region of retina lacks the receptors and is not capable to perceive images that fall on it. This area is termed as optic disc and if charting the field of vision. This is termed to as the blind spot.

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