Maculla

29.04.2018 1 Comments

Further, it indicates that cortical damage rostral to, and including, lateral geniculate nucleus is an unlikely outcome of the infarction, as too much of the lateral geniculate nucleus is, proportionally, devoted to macular-stream processing. The brain combines the signals from neighboring cones to distinguish different colors. In the case of occipitoparietal ischemia owing to occlusion of elements of either posterior cerebral artery , patients may display cortical blindness which, rarely, can involve blindness that the patient denies having, as seen in Anton's Syndrome , yet display sparing of the macula. The macula is thus responsible for the central, high-resolution, color vision that is possible in good light; and this kind of vision is impaired if the macula is damaged, for example in macular degeneration. This selective sparing is due to the collateral circulation offered to macular tracts by the middle cerebral artery.

Maculla


The grey, more diffuse spot in the centre is a shadow artifact. There is only one type of rod, but the rods are more sensitive than the cones, so in dim light they are the dominant photoreceeptors active, and without information provided by the separate spectral sensitivity of the cones it is impossible to discriminate colors. Further, it indicates that cortical damage rostral to, and including, lateral geniculate nucleus is an unlikely outcome of the infarction, as too much of the lateral geniculate nucleus is, proportionally, devoted to macular-stream processing. In details, the normal human eye contains three different types of cones, with different ranges of spectral sensitivity. Visual input from the macula occupies a substantial portion of the brain's visual capacity. Within the macula are the fovea and foveola that both contain a high density of cones , which are nerve cells that are photoreceptors with high acuity. Function[ edit ] Structures in the macula are specialized for high- acuity vision. In the fovea centralis, cones predominate, and are present at high density. In the case of occipitoparietal ischemia owing to occlusion of elements of either posterior cerebral artery , patients may display cortical blindness which, rarely, can involve blindness that the patient denies having, as seen in Anton's Syndrome , yet display sparing of the macula. The optic disc is the area on the right where blood vessels converge. The brain combines the signals from neighboring cones to distinguish different colors. As a result, some forms of visual field loss that occur without involving the macula are termed macular sparing. The clinical macula is seen when viewed from the pupil, as in ophthalmoscopy or retinal photography. For example, visual field testing might demonstrate homonymous hemianopsia with macular sparing. Macular holes are rarely caused by trauma, but if a severe blow is delivered it can burst the blood vessels going to the macula, destroying it. Whereas loss of peripheral vision may go unnoticed for some time, damage to the macula will result in loss of central vision, which is usually immediately obvious. The macula is thus responsible for the central, high-resolution, color vision that is possible in good light; and this kind of vision is impaired if the macula is damaged, for example in macular degeneration. The progressive destruction of the macula is a disease known as macular degeneration and can sometimes lead to the creation of a macular hole. This selective sparing is due to the collateral circulation offered to macular tracts by the middle cerebral artery. The gaze is into the camera, so in each picture the macula is in the center of the image, and the optic disk is located towards the nose. Clinical significance[ edit ] Fundus photographs of the right eye left image and left eye right image , seen from front so that left in each image is to the person's right.

Maculla


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