What is an Egyptian cataract?
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.
How did cataracts help the Egyptians?
Nile's cataracts helped and hurt Egypt by flooding every year and bringing down boulders and trees. The Egyptians were protected from invaders due to their geographical features. Furthermore the cataracts in the Nile to the south protected the Egyptians from lands below them.
What is the first cataract in Egypt?
The Nile River is shown above passing the granite islands that form the first cataract at Aswan City, Egypt. Cataracts occur where outcrops of granite, as well as other resistant rocks, reach the banks of the Nile River.
Did ancient Egyptians do cataract surgery?
The first recorded case of cataract surgery dates back to the fifth century BC. However, artifacts from ancient Egypt and other places have shown that various ancient civilizations have performed their own cataract surgery.
What is a geological cataract?
cataract, a waterfall (q.v.), especially one containing great volumes of water rushing over a precipice.
Did ancient Egyptians perform cataract surgery?
The first recorded case of cataract surgery dates back to the fifth century BC. However, artifacts from ancient Egypt and other places have shown that various ancient civilizations have performed their own cataract surgery.
Did the Egyptians perform cataract surgery?
These findings confirm the high surgical skill level achieved and the possibility that ancient Egyptians and Babylonians used the couching procedure to dislodge the cataract away from the pupil before Indian surgeons.
What does cataract mean in geography?
a waterfall cataract, a waterfall (q.v.), especially one containing great volumes of water rushing over a precipice.
What is the difference between a cataract and a waterfall?
A cataract is a type of waterfall with a large, single vertical drop, usually falling clear of the bedrock. A cascade waterfall is used to describe a waterfall running over an irregular steep surfaced gradient where the water is generally in contact with the river bedrock.
Who invented cataract surgery?
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%.
How did they remove cataracts in the old days?
One of the earliest surgical interventions for cataracts, dating as early as the 5th century BC, was a technique called couching, which comes from the french word “coucher” meaning “to put to bed.” In this method, a sharp needle is used to pierce the eye near the limbus until the provider can manually dislodge the …
What is cataract in world history?
Cataract dates to the 14th century and comes from the Latin word cataracta, meaning "portcullis." The Latin pertains to the ocular cataract, probably because it obstructs one's vision much like the portcullis's heavy iron grating obstructs passage into a fortress or castle.
How did cataracts affect Egypt and Nubia?
How did the cataracts of the Nile affect Nubian trade? The cataracts prevented Nubians from trading by traveling on the river, so Nubian trade routes had to be over land.
What is cataract Africa?
Senile cataract is a non-preventable disease of aging, having its biggest impact in the over-60 age group. Published clinic and hospital data, population-based surveys and World Health Organization estimates indicate that 1.2% of the entire population of Africa is blind, and that cataract causes 36% of this blindness.
What is an example of a cataract?
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.
Who invented cataract surgery Islam?
Cataract Surgery in the Islamic World Building on previous techniques in the Ancient world, 10th century Persian physician Muhammad ibn Zakariya al-Razi developed a cataract surgery technique that used Antyllus' suction equipment.
How did the cataracts of the Nile river affected Nubian trade?
How did the cataracts of the Nile affect Nubian trade? The cataracts prevented Nubians from trading by traveling on the river, so Nubian trade routes had to be over land.
Why do so many people in Africa have cataracts?
Vitamin A is a vitamin directly linked to eye health, so there is likely a correlation between vitamin A deficiency in Mali and the prevalence of cataracts in the country.
What is cataract geography?
The term cataract is usually applied to that section of a rapidly flowing river where the running water falls suddenly in a sheer drop. When the drop is less steep, the fall is known as a cascade.
What is a cataract history?
Cataracts may actually be one of the first ailments people attempted to treat surgically. Our earliest records of it date back to 600 BC. In those days, they used something called the “couching” technique, which involved smacking the eye with a blunt object until the lens dislodged entirely.
How did Muslims remove cataracts?
In treating cataracts, the technique commonly employed was couching. This method consisted of pushing the lens of the eye out of the way by inserting into the eye a needle or probe through the edge of the cornea. Infection and glaucoma were the major causes for failure.
Where did cataract surgery originate?
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%.
What race were Nubians?
They are descended from an ancient African civilisation that ruled over an empire stretching, at its height, across the north-east corner of the continent. Most Nubians lived along the Nile river in what is now southern Egypt and northern Sudan—a region often referred to as Nubia.
Why do kids in Africa get cataracts?
Among cases for which a cause could be identified, heredity is the most common etiology of congenital cataracts (6). Congenital and develop- mental cataract may be caused by mutations in specific genes (7,8). Cataract in children may also be the result of intrauterine infection or be associated with syndromes.
How was a cataract named?
The word cataract comes from the Latin word “cataracta” meaning waterfall, with the condition possibly therefore named after the white appearance of rapidly running water.
Did the Egyptians do cataract surgery?
Ancient Cataract Procedures Ancient artifacts found on the tomb of King Khasekhemwy, dating back to 2700 BC, prove that the ancient Egyptians operated on the cataract at that time.
Which pharaohs were black?
Kushite rulers In the 8th century BCE, he noted, Kushite rulers were crowned as Kings of Egypt, ruling a combined Nubian and Egyptian kingdom as pharaohs of Egypt's 25th Dynasty. Those Kushite kings are commonly referred to as the “Black Pharaohs” in both scholarly and popular publications.
What skin color were ancient Egyptian?
Ancient Egyptians Were Likely To Be Ethnically Diverse Instead, they simply classified themselves by the regions where they lived. Scholarly research suggests there were many different skin colours across Egypt, including what we now call white, brown and black.
What is a cataract in Africa?
Senile cataract is a non-preventable disease of aging, having its biggest impact in the over-60 age group. Published clinic and hospital data, population-based surveys and World Health Organization estimates indicate that 1.2% of the entire population of Africa is blind, and that cataract causes 36% of this blindness.
What does cataract mean in history?
Cataract dates to the 14th century and comes from the Latin word cataracta, meaning "portcullis." The Latin pertains to the ocular cataract, probably because it obstructs one's vision much like the portcullis's heavy iron grating obstructs passage into a fortress or castle.