Blind Spot In Human Eye
Central scotoma a blind spot or decreased area of vision located in the center of the vision field which severely affects a person s ability to see read and perform daily tasks hemianopic scotoma a blind spot or decreased area of vision located on the half of the central visual field with a great impact on daily life as well.
Blind spot in human eye. Light gets into they eye by passing through the pupil. It occurs because of the structure of the eye and a lack of photoreceptors. As a result the retina has no photoreceptors in that location.
Cover your left eye and look at the plus in the middle of the green background with your right eye. The blind spot of the human eye is the consequence of evolution that has resulted in an optic nerve that connects to the front of the retina by passing through it from the back. Blind spot 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.
Distribution of rods and cones along a line passing through the fovea and the blind spot of a human eye since the fovea does not have rods it is not sensitive to dim lighting. One example of this is a blind spot or a small portion of the visual field that corresponds to the location of the optic disk located at the back of the eye. Now let s try the same exercise with the new image above.
Hence in order to observe dim stars astronomers use averted vision looking out of the side of their eyes where the density of rods is greater and hence dim objects are more easily visible. Move closer to the screen as before. Each human eye has a blind spot and the brain sometimes has to fill in what is there by looking at the surrounding area.
Position your head to look straight at the image. The human eye is pretty good at accurately detecting an enormous array of information about the world around us but it does have its limitations. Having a blind spot in each eye is a natural occurrence and is typically not cause for concern.
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. Every human eye has a blind spot.
