<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (November 2011) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (November 2011) (Learn how and when to remove this template message) </Td> </Tr> <P> A blind spot, scotoma, is an obscuration of the visual field . A particular blind spot known as the physiological blind spot, "blind point", or punctum caecum in medical literature, is the place in the visual field that corresponds to the lack of light - detecting photoreceptor cells on the optic disc of the retina where the optic nerve passes through the optic disc . Because there are no cells to detect light on the optic disc, the corresponding part of the field of vision is invisible . Some process in our brains interpolates the blind spot based on surrounding detail and information from the other eye, so we do not normally perceive the blind spot . </P> <P> Although all vertebrates have this blind spot, cephalopod eyes, which are only superficially similar, do not . In them, the optic nerve approaches the receptors from behind, so it does not create a break in the retina . </P>

The blind spot is located in what area of the retina