Blind Spot
Blind Spot (pronunciation: /blaɪnd spɒt/)
The blind spot is a specific area in the Visual field where the Retina of the Eye lacks Photoreceptor cells and, therefore, cannot receive and process light information, resulting in a gap in the visual field.
Etymology
The term "blind spot" originates from the English words "blind," meaning unable to see, and "spot," referring to a specific location or area.
Anatomy
The blind spot, also known as the Optic disc, is located in the retina at the point of exit for the Optic nerve fibers. It is devoid of photoreceptor cells, specifically Rod cells and Cone cells, which are responsible for detecting light and color, respectively.
Physiology
Despite the presence of the blind spot, humans do not typically perceive a hole in their visual field. This phenomenon is due to the process of Perceptual filling-in, where the brain fills in the gap in the visual field with information from the surrounding area or the corresponding area in the other eye.
Clinical significance
In certain medical conditions, such as Glaucoma, the size of the blind spot may increase, a phenomenon known as Scotoma. This can be detected through a Visual field test.
Related terms
- Visual field: The total area that can be seen when the eye is focused on a central point.
- Optic disc: The point in the eye where the optic nerve leaves the retina.
- Perceptual filling-in: The brain's ability to fill in visual information in the blind spot.
- Scotoma: An area of partial alteration in the field of vision.
External links
- Medical encyclopedia article on Blind Spot
- Wikipedia's article - Blind Spot
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