Is Tuesday named for a one-handed god?
1864, "spot within one's range of vision where yet one cannot see." Of flaws in the eye, from 1872; figurative sense in use by 1907.
blind spot n.
See optic disk.
The area of blindness in the visual field corresponding to the optic disk. Also called physiologic scotoma, punctum cecum.
An area or facet of one's personality of which one remains ignorant or fails to gain understanding. Also called mental scotoma, scotoma.
Note: In a general sense, the term is used to refer to an inability to see things that might be obvious to another observer: “He has a blind spot as far as his daughter's behavior is concerned.”
small portion of the visual field of each eye that corresponds to the position of the optic disk (also known as the optic nerve head) within the retina. There are no photoreceptors (i.e., rods or cones) in the optic disk, and, therefore, there is no image detection in this area. The blind spot of the right eye is located to the right of the centre of vision and vice versa in the left eye. With both eyes open, the blind spots are not perceived because the visual fields of the two eyes overlap. Indeed, even with one eye closed, the blind spot can be difficult to detect subjectively because of the ability of the brain to "fill in" or ignore the missing portion of the image