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What is the definition of cataract in geography?
Cataract, a waterfall (q.v.), especially one containing great volumes of water rushing over a precipice. via
What does cataract mean in ancient Egypt?
The word cataract comes from the Greek word Katarakhtes meaning "waterfall". In ancient times, Upper Egypt extended from the Nile Delta to the first cataract. Further upstream, in what is modern Sudan, the land was later controlled by the Kingdom of Kush. via
What does cataract mean in history?
1 [Middle English, from Middle French or Medieval Latin; Middle French catharacte, from Medieval Latin cataracta, from Latin, portcullis] : a clouding of the lens of the eye or of its surrounding transparent membrane that obstructs the passage of light. via
What is the difference between a waterfall and a cataract?
A waterfall is an area where water flows over a vertical drop or a series of steep drops in the course of a stream or river. Waterfalls also occur where meltwater drops over the edge of a tabular iceberg or ice shelf. A cataract is a cloudy area in the lens of the eye that leads to a decrease in vision. via
Why is it called cataract?
"Cataract" is derived from the Latin cataracta, meaning "waterfall", and from the Ancient Greek καταρράκτης (katarrhaktēs), "down-rushing", from καταράσσω (katarassō) meaning "to dash down" (from kata-, "down"; arassein, "to strike, dash"). via
What are the 3 types of cataracts?
A cataract is a clouding of the lens of the eye that impairs vision. There are three main types of cataract: Nuclear Sclerotic, Cortical and Posterior Subcapsular. The types of cataracts are classified based on where and how they develop in the eye. via
What are the Egyptian cataracts?
The Cataracts of the Nile are shallow lengths (or whitewater rapids) of the Nile River, between Khartoum and Aswan, where the surface of the water is broken by many small boulders and stones jutting out of the river bed, as well as many rocky islets. via
What is cataracts on your eyes?
A cataract is a clouding of the normally clear lens of the eye. For people who have cataracts, seeing through cloudy lenses is a bit like looking through a frosty or fogged-up window. via
What was the importance of cataracts?
Cataract surgery improves your overall quality of life. It postively impacts the activities you perform each day, like reading, working, driving, and any other hobbies you may have. Some other common long-term benefits of cataract surgery include: Less dependence on glasses or contacts. via
Is cataract surgery painful?
Cataract surgery is not painful. While patients are awake during surgery, there is little or no discomfort involved. A mild sedative may be administered before the surgery, which calms the nerves, and eye drops are used to numb the eye. via
Can cataract be cured?
Surgery is the only way to get rid of a cataract, but you may not need to get surgery right away. Home treatment. Early on, you may be able to make small changes to manage your cataracts. via
When were cataracts first removed?
The first true cataract extraction was performed in 1747, in Paris, by the French surgeon Jacques Daviel. His procedure was more effective than couching, with an overall success rate of 50%. via
Where is the largest waterfall in the world?
Indeed, the world's largest waterfall lies beneath the Denmark Strait, which separates Iceland and Greenland. At the bottom of the strait are a series of cataracts that begin 2,000 feet under the strait's surface and plunge to a depth of 10,000 feet at the southern tip of Greenland—nearly a two-mile drop. via
What is a little waterfall called?
Waterfalls of small height and lesser steepness are called cascades; this term is often applied to a series of small falls along a river. via
How is a cataract waterfall formed?
A cataract waterfall occurs when a large amount of fast-moving water falls over a cliff. This type is categorized simply on sheer size and power. Standing next to one can make you feel exceptionally small and fragile, and reminds viewers of the extraordinary strength of nature. via