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A blind spot, also known as a scotoma, is an obscuration of the visual field. A particular blind spot known as the blind spot, or physiological blind spot, 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 it. Since there are no cells to detect light on the optic disc, a part of the field of vision is not perceived. The brain fills in with surrounding detail and with information from the other eye, so the blind spot is not normally perceived. Blind spot can refer to: In ophthalmology, Scotoma, an obscuration of the visual field Optic disc, also known as the anatomical blind spot, the specific region of the retina where the optic nerve and blood vessels pass through to connect to the back of the eye Blind spot (vision), also...
The word scotoma is derived from the Greek word for darkness. ...
The term visual field is sometimes used as a synonym to field of view, though they do not designate the same thing. ...
This article is about cellular photoreceptors. ...
The optic disc or optic nerve head is the location where ganglion cell axons exit the eye to form the optic nerve. ...
Human eye cross-sectional view. ...
This article is about the anatomical structure. ...
In animals, the brain or encephalon (Greek for in the head), is the control center of the central nervous system, responsible for behaviour. ...
For other uses, see Eye (disambiguation). ...
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. This article does not cite any references or sources. ...
Orders Subclass Nautiloidea †Plectronocerida †Ellesmerocerida †Actinocerida †Pseudorthocerida †Endocerida †Tarphycerida †Oncocerida †Discosorida Nautilida †Orthocerida †Ascocerida †Bactritida Subclass †Ammonoidea †Goniatitida †Ceratitida †Ammonitida Subclass Coleoidea †Belemnoidea †Aulacocerida †Belemnitida †Hematitida †Phragmoteuthida Neocoleoidea (most living cephalopods) ?†Boletzkyida Sepiida Sepiolida Spirulida Teuthida Octopoda Vampyromorphida The cephalopods (Greek plural (kephalópoda); head-foot) are the mollusk class...
The first documented observation of the phenomenon was in the 1660s by Edme Mariotte in France, at a time when it was generally thought that the point at which the optic nerve entered the eye should actually be the most sensitive portion of the retina [1]. Edme Mariotte (c. ...
| Try it yourself | | | A | O | | X | | | Instructions: Your face should be very close to the screen. Cover right eye and focus the left eye on the X. Now slowly move away from the screen.
The O will disappear, while the A which is further to the left is still visible. (Observe that you do not see a hole. Instead of the O you see a uniform grey background. The "hole" is filled in by your brain. Make sure there is not a glare on the screen as it will obscure the whole vision.) |
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