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In a technique known as blue field entoptoscopy, the effect is used to estimate the blood flow in the retinal capillaries.The patient is alternatingly shown blue light and a computer generated picture of moving dots; by adjusting the speed and density of these dots, the patient tries to match the computer generated picture to the perceived entoptic dots.
A rift valley is a linear shaped lowland between several highlands or mountain ranges produced by the action of a geologic rift. Rifts are formed as a result of the pulling apart of the lithosphere due to extensional tectonics .
The Great Rift Valley is part of an intra-continental ridge system that runs through Kenya from north to south. It is part of the Gregory Rift , the eastern branch of the East African Rift , which starts in Tanzania to the south and continues northward into Ethiopia . [ 1 ]
The Great Rift Valley (Swahili: Bonde la ufa) is a series of contiguous geographic depressions, approximately 6,000 or 7,000 kilometres (4,300 mi) in total length, the definition varying between sources, that runs from the southern Turkish Hatay Province in Asia, through the Red Sea, to Mozambique in Southeast Africa.
The half grabens may have alternating polarities along the rift axis, dividing the rift valley into segments. [ 4 ] Intracontinental and marine rift basins such as the Gulf of Suez , East African Rift , Rio Grande rift system and the North Sea often contain a series of half-graben sub-basins, with the polarity of the dominant fault system ...
The Central Lowlands, sometimes called the Midland Valley or Central Valley, [1] is a geologically defined area of relatively low-lying land in southern Scotland. It consists of a rift valley between the Highland Boundary Fault to the north and the Southern Uplands Fault to the south. [ 2 ]
Paint dots at head height mean the tree needs pruning. “Basically, it marks the tree in an inconspicuous way,” says Ken Fisher, assistant forester for the Boulder Parks and Recreation Department.
The Southern Rift Valley lakes are like the Western Rift Valley lakes in that, with one exception, they are freshwater lakes. Lake Rukwa (about 5,670 square kilometres (2,190 sq mi) but quite variable) in Tanzania is the alkaline exception, lying south-east of Tanganyika, and has no outlet.