What Is A Cataract In Geography - Micro B Life (2023)

What Is A Cataract In Geography?

cataract a waterfall (q.v.) especially one containing great volumes of water rushing over a precipice.

What is an example of a cataract in geography?

A waterfall in which a large volume of water flows over a steep precipice. A large waterfall steep rapids in a river. … The definition of a cataract is a flood waterfall or rush of water or an eye disease when the lens becomes opaque causing partial or total blindness. An example of a cataract is Niagara Falls.

What are cataracts of a river?

Cataracts are waterfalls on very large rivers. They do not have to be high but they carry enormous volumes of water. The word cataract is not used for most waterfalls. It is used for waterfalls along the River Nile in Egypt which are little more than steps but there are steps in other places too.

Where is the cataract geography?

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.

What is the best definition of cataract?

1 : a clouding of the lens of the eye or of the cover around the lens that blocks the passage of light. 2 : a large waterfall. 3 : a sudden rush or flow like a waterfall.

What are cataracts and rapids?

As nouns the difference between rapid and cataract

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(Video) CATARACT LECTURE | PG NOTES

is that rapid is (often|in the plural) a rough section of a river or stream which is difficult to navigate due to the swift and turbulent motion of the water while cataract is (obsolete) a waterspout.

Is cataract and waterfall the same?

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.

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”).

Why are waterfalls called cataracts?

It’s a derivative of katarassein from kata– “down” plus arassein “strike smash”. … It was soon after applied to a large waterfall strictly one in which the water plummets over a precipice this came from a Latin use of the word to describe the Cataracts of the Nile.

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.

What are cataracts in mountains?

a descent of water over a steep surface a waterfall especially one of considerable size. any furious rush or downpour of water deluge.

What is Cascade in geography?

cascade waterfall especially a series of small falls consisting of water descending over rocks or boulders. It may be natural or it may be artificial.

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. … Kemet means “the black lands.” They referred to their land this way because it was composed of the dark soil left by the Nile’s floods.

(Video) Cataract Surgery

What is cataract in simple words?

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.

What are cataracts in history?

Cataracts have been known to mankind for centuries. A cataract is a white or cloudy patch that develops in the eye lens reducing the amount of light that passes through it and leading to blurred vision.

What is cataract Class 10?

Cataract : Due to the membrane growth over eye lens the eye lens becomes hazy or even opaque. This leads to decrease or loss of vision. The problem is called cataract. It can be corrected only by surgery.

What does cataract mean in Egypt?

In fact “cataract” means both an opacity of the lens and a torrent of water and is derived from the Greek word kataráktēs meaning the fall of water. … A wall painting in an ancient tomb at Thebes (about 1200 B.C.) seems to reveal the treatment of an eye by an oculist.

Why are cataracts important?

A cataract is the clouding of the normally clear lens that sits in the eye behind the pupil. Most cataracts are related to aging. More than half of all Americans have had a cataract or cataract surgery by age 80.

Cataract. a large waterfall any strong flood or rush of water. delta. a triangular shaped plain at the mouth of a river formed when sediment is deposited by flowing water.

What is cataract and Cascade?

Cataract: A large powerful waterfall. … Cascade: Water descends a series of rock steps. Segmented: Distinctly separate flows of water form as it descends. Tiered: Water drops in a series of distinct steps or falls.

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What is the space behind a waterfall called?

The resulting erosion at the base of a waterfall can be very dramatic and cause the waterfall to “recede.” The area behind the waterfall is worn away creating a hollow cave-like structure called a “rock shelter.” Eventually the rocky ledge (called the outcropping) may tumble down sending boulders into the stream …

Which is the highest fall in India?

List of waterfalls in India by height

(Video) Cataract Surgery Animation

WaterfallHeightRemarks
Nohkalikai Falls340m (1115 feet)tallest plunge type waterfalls
Nohsngithiang Falls or Mawsmai Falls315 metres (1 033 ft)segmented type waterfalls
Dudhsagar Falls310 metres (1 020 ft)4 tiered waterfalls
Kynrem Falls305 metres (1 001 ft)3 tiered waterfalls

What is cataract Class 8?

(3) The medical condition in which the lens of eye of a person becomes progressively cloudy resulting in blurred vision is called cataract. Cataract develops when the eye-lens of a person becomes cloudy (or even opaque) due to the formation of a membrane over it. Cataract decreases the vision of the eye gradually.

Where do Cataracts form?

A cataract develops when the lens in your eye which is normally clear becomes foggy. For your eye to see light passes through a clear lens. The lens is behind your iris (colored part of your eye). The lens focuses the light so that your brain and eye can work together to process information into a picture.

What are cataracts made of?

Cataracts are a clouding of the lens in the eye. It is the result of the normal aging process and comes from a build-up of protein on the eyes lens.

What are rapids and waterfalls?

Waterfalls and rapids

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Waterfalls are created when the riverbed changes suddenly from hard rock to soft rock. Rapids are formed where a fast-flowing river quickly cuts downward through a bed of hard and soft rocks eroding the soft rock and leaving the hard rocks standing above the water surface.

What is the difference between waterfall and Cascade?

A waterfall is a place where a river flows over a sharp edge. Cascades are a series of small continuous waterfalls.

What are rapids in geography?

Rapids are sections of a river where the river bed has a relatively steep gradient causing an increase in water velocity and turbulence. Rapidsare hydrological features between a run (a smoothly flowing part of a stream) and a cascade.

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Where does Niagara Falls lie in North America?

The falls lie on the border between Ontario Canada and New York state U.S. For many decades the falls were an attraction for honeymooners and for such stunts as walking over the falls on a tightrope or going over them in a barrel.

What is a cataract and how many does the River Nile have?

In the south the Nile has a series of six main cataracts which begin at the site of Aswan. A cataract is a shallow stretch of turbulent waters formed where flowing waters encounter resistant rock layers.

What is a cataract in the Nile River make transportation difficult?

How did cataracts in the Nile River make transportation difficult? Cataracts caused parts of the riverbed to dry out. Cataracts contained rocks and boulders that made the river impassable.

Are cascades part of Rocky mountains?

Being the easternmost portion of the North American Cordillera the Rockies are distinct from the tectonically younger Cascade Range and Sierra Nevada which both lie farther to its west.

Rocky Mountains
States/ProvincesBritish Columbia Alberta Washington Idaho Montana Wyoming Utah Colorado and New Mexico

Are the Cascade mountains still growing?

The North Cascades are still rising shifting and forming. Geologists believe that these mountains are a collage of terranes distinct assemblages of rock separated by faults. … During the past 40 million years heavier oceanic rocks thrust beneath the edge of this region.

What is Cascade in hibernate?

Cascading is about persistence actions involving one object propagating to other objects via an association. Cascading can apply to a variety of Hibernate actions and it is typically transitive.

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Cataracts | Causes Risk factors Subtypes (Cortical Nuclear Posterior subcapsular) Treatment

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FAQs

What is a cataracts in geography? ›

cataract, a waterfall (q.v.), especially one containing great volumes of water rushing over a precipice.

What is cataract very short answer? ›

A cataract occurs when the lens of your eye becomes cloudy. Eventually, a cataract can advance to the degree of the one shown in this person's right eye.

What is cataract Class 8 answer? ›

Cataract is an opacity (cloud formation) of the eye lens, develops due to aging.

What is cataract in life science? ›

A cataract is a cloudy area in the lens of your eye. Cataracts are very common as you get older. In fact, more than half of all Americans age 80 or older either have cataracts or have had surgery to get rid of cataracts. At first, you may not notice that you have a cataract.

Why is it called a cataract? ›

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.

Where is the first cataract? ›

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.

What is cataract class 10th? ›

Cataract : Due to the membrane growth over eye lens, the eye lens becomes hazy or even opaque. This leads to decrease or loss of vision. The problem is called cataract. It can be corrected only by surgery.

What is a cataract made of? ›

A cataract occurs when there is a buildup of proteins in the lens, creating protein clumps. These clumps, or deposits, prevent light from passing clearly through the lens, thus disrupting normal vision. There are several reasons why a cataract may form including: Aging – The eyes mainly consist of water and protein.

What are the types of cataract? ›

There are 5 main types of cataracts.
  • Age-related cataract. As you age, a cataract can develop because of natural changes in the lens of your eye. ...
  • Traumatic cataract. Serious eye injuries can damage your lens and cause a cataract. ...
  • Radiation cataract. Certain types of radiation can cause cataracts. ...
  • Pediatric cataract.
3 Aug 2019

What is the cause of cataract Class 8? ›

Cataract develops when the eye-lens of a person becomes cloudy (or even opaque) due to the formation of a membrane over it. Cataract decreases the vision of the eye gradually.

What is eye Class 8? ›

It is almost like a sphere(almost round) Its outer coat is white. It is tough so that it can protect the interior of the eye from accidents. The eye has many different parts like cornea,iris,pupil,lens,retina etc.

How do you correct a Class 10 cataract? ›

Solution : Sometimes, particularly in old age, eyesight becomes foggy due to which the eye lens becomes cloudy. This is called cataract in which sometimes there is severe loss of vision. <br> This defect can be treated by removing the opaque lens and inserting a new artificial lens in the eye.

What are the causes of cataract Class 10? ›

What is the cause of cataract and how it can be corrected?
  • A. Cause: Irregular shape of cornea. Correction: By surgery. ...
  • B. Cause: Formation of membrane over the eye lens. Correction: By using cylindrical lens. ...
  • C. Cause: Irregular shape of cornea. ...
  • D. Cause: Formation of membrane over the eye lens.

Where is a cataract located? ›

A cataract is the clouding of the normally clear lens that sits in the eye behind the pupil. Most cataracts are related to aging. More than half of all Americans have had a cataract or cataract surgery by age 80.

Are cataracts white? ›

Cataracts are whitish or cloudy patches that develop in a person's eye lens and lead to blurred or clouded vision. Cataracts are the most common cause of visual impairment worldwide.

Who discovered cataract? ›

Extracapsular Cataract Extraction

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%.

Why cataract is called waterfall? ›

[9] Early Persian physicians called the term nazul-i-ah, or “descent of the water”—vulgarised into waterfall disease or cataract—believing such blindness to be caused by an outpouring of corrupt humour into the eye (Wikipedia)

Is cataract another word for waterfall? ›

In this page you can discover 38 synonyms, antonyms, idiomatic expressions, and related words for cataract, like: waterfall, rapids, flood, torrent, deluge, water, cascade, , downpour, fall and falls.

How did cataracts help Egypt? ›

Besides the Kushite invasion, for most of Egyptian history, the Nile's cataracts, particularly the First Cataract, primarily served as a natural border to prevent most crossings from the south, as those in said region would rely on river travel to venture north and south.

How many cataracts are in Egypt? ›

In the south, the Nile has a series of six main cataracts, which begin at the site of Aswan. A cataract is a shallow stretch of turbulent waters formed where flowing waters encounter resistant rock layers.

What does delta mean in ancient Egypt? ›

In ancient times Greek merchants who sailed to Egypt noticed that the Nile River branched into two streams before flowing into the sea. The sea and the river's branches enclosed a piece of land shaped like a triangle. The Greeks called that land a delta because it resembled the fourth letter of the Greek alphabet (Δ).

What is cataract Byjus? ›

A cataract is a clouding of the lens in the eye which leads to a decrease in vision. Cataracts often develop slowly and can affect one or both eyes.

What is Blind Spot Class 10? ›

Blind spot is the region where the optic nerve passes through the optic disk and out of the eyes. Also, it is at this very region that the blood vessels enter the eyes. It lacks photoreceptor cells (rods and cones) in the retina so the light falling at this spot does not form any image.

What is retina in eye Class 10? ›

Retina: It is a light-sensitive layer that consists of numerous nerve cells. It converts images formed by the lens into electrical impulses. These electrical impulses are then transmitted to the brain through optic nerves. Optic nerves: Optic nerves are of two types.

How do cataracts form? ›

A cataract develops when the lens in your eye, which is normally clear, becomes foggy. For your eye to see, light passes through a clear lens. The lens is behind your iris (colored part of your eye). The lens focuses the light so that your brain and eye can work together to process information into a picture.

What is a Grade 3 cataract? ›

A 3+ cataract. This cataract is so dense that the cortex has liquefied, allowing the nucleus to sink to the bottom of the lens capsule. This special type of very dense cataract is known as a Morgagnian cataract.

Does the sun cause cataracts? ›

It's well known that exposure to ultraviolet (UV) light from the sun can cause skin damage. But many studies show that UV light can also increase the risk of cataract and other eye conditions.

What are the 3 types of cataract lenses? ›

There are three different types of intraocular lenses available including monofocal, toric, and presbyopic-correcting.

How is cataracts removed? ›

Phacoemulsification: With this procedure, the doctor uses a tool that produces sound waves to break up the cataract into small pieces. The pieces are then suctioned out. This procedure uses a very small incision. Extracapsular extraction: The doctor uses a small tool to remove the cataract in mostly one piece.

Are cataracts painful? ›

As for pain, cataracts generally do not hurt, other than some sensitivity to light and glare. As cataracts develop, you may start experiencing other symptoms like inflammation and headaches.

How is cataract treated class 8? ›

If a person is suffering from a cataract their eye lens will be cloudy. Cataract can be treated by replacing opaque lenses with artificial lens. We can see a non-luminous object when light:(a) emitted by the object falls on the eye. (b) is reflec...

What is night blindness Class 8? ›

When a person lacks rod cells in retina he is not able to see the objects clearly in less/dim light such a defect is called night blindness.

What is the function of human eye Class 10? ›

The human eye works on the refraction of light through a natural convex lens made of transparent living material and enables us to see things around us. The main parts of the human eye are : Cornea, Iris, Pupil, Ciliary muscles, Eye lens, Retina and Optic nerve.

What is the function of ciliary muscles Class 10? ›

The ciliary body is a circular structure and it lies between the iris and choroid. The ciliary process produces the fluid in the eye called aqueous humor. And it also contains the ciliary muscle, which changes the shape of the lens when your eyes focus on a near object.

What is human eye? ›

The human eye is a sensory organ, part of the sensory nervous system, that reacts to visible light and allows us to use visual information for various purposes including seeing things, keeping our balance, and maintaining circadian rhythm. Human eye.

What is the function of eyes for Class 1? ›

Your eyes are at work from the moment you wake up to the moment you close them to go to sleep. They take in tons of information about the world around you — shapes, colors, movements, and more. Then they send the information to your brain for processing so the brain knows what's going on outside of your body.

What are the common eye defects give their causes and corrective measures Class 8? ›

There are three common eye defects, and they are(i) myopia or near-sightedness, (ii) Hypermetropia or far-sightedness, and (iii) Presbyopia. These defects are corrected by the use of suitable spherical lenses. In the article, we focus on myopia and its correction.

What are the 5 defects of eye? ›

Here, ophthalmologist Richard Gans, MD, explains the five most common conditions affecting your vision and shares tips for preserving your eyesight.
  • Cataract. ...
  • Diabetic retinopathy. ...
  • Macular degeneration. ...
  • Glaucoma. ...
  • Refractive errors.
5 Jan 2021

How does one detect cataract in early stages Class 10? ›

(b) Cataract generally occurs in old age. (c) In old age, the lens of the eye hardens, loses its transparency and so becomes opaque. (d) One can detect cataract, in early stages with the help of symptoms such as blurring of the vision and sometimes seeing multiple images.

How are cataracts formed geography? ›

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.

Why are waterfalls called cataracts? ›

The term “cataract” is derived from the Latin, “cataracta” which means “waterfall” and the Greek” katarhaktes” which means “waterfall, broken water; swooping, rushing down”.

What is the difference between a waterfall and a cataract? ›

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.

What are the 3 types of cataracts? ›

There are three primary types of cataracts: nuclear sclerotic, cortical and posterior subcapsular.

What is the sentence of cataract? ›

He has cataracts in both eyes and has been told that he has to wait 18 months. He now suffers from a disabling and possibly terminal disease, and is almost blind with cataracts. She suffers from cataracts, cannot read, and is taking morphine to relieve the pain. She has inoperable cataracts and suffers from tinnitus.

What is a cataract in the Nile river? ›

The Cataracts of the Nile are shallow lengths 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 many cataracts are in the Nile river? ›

Answer. Yes, the Nile's most significant rapids are the six “Cataracts of the Nile.” The Cataracts of the Nile are a long, shallow stretch of the river between Khartoum, Sudan, and Aswan, Egypt. 7.

What is a waterfall called? ›

Waterfalls are also called cascades. The process of erosion, the wearing away of earth, plays an important part in the formation of waterfalls.

Can you swim at cataract falls? ›

This is a beautiful location, with two separate areas that might be possible for swimming. There is a calmer area above the main falls with small pools and various small waterfalls. The other area is below the main waterfall, which is difficult to get to and not recommended for children.

Who has had cataract surgery? ›

A cataract can occur in one eye or both eyes, however, it cannot spread from one eye to the other.
...
Here's a handful of celebrities who have undergone cataract surgery and successfully regained their vision.
  • Matthew Wright. ...
  • Mila Kunis. ...
  • John Goodman. ...
  • Joan Rivers. ...
  • Larry King.
18 Jan 2019

Which is highest Falls in India? ›

Which is the highest waterfall in India? Kunchikal Falls in Shimoga District Karnataka is the highest waterfall in India with a height of 1493 feet.

What are short waterfalls 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.

How many waterfalls are there in India? ›

List of waterfalls in India by height
Height-wise rankWaterfallHeight
6Thalaiyar Falls297 metres (974 ft)
7Barkana Falls259 metres (850 ft)
8Jog Falls253 metres (830 ft)
9Khandadhar Falls244 metres (801 ft)
47 more rows

What are the 2 types of cataracts? ›

There are 5 main types of cataracts.
  • Age-related cataract. As you age, a cataract can develop because of natural changes in the lens of your eye. ...
  • Traumatic cataract. Serious eye injuries can damage your lens and cause a cataract. ...
  • Radiation cataract. Certain types of radiation can cause cataracts. ...
  • Pediatric cataract.
3 Aug 2019

What is a cataract made of? ›

A cataract occurs when there is a buildup of proteins in the lens, creating protein clumps. These clumps, or deposits, prevent light from passing clearly through the lens, thus disrupting normal vision. There are several reasons why a cataract may form including: Aging – The eyes mainly consist of water and protein.

What is the most common type of cataract? ›

A nuclear cataract is the most common type of age-related cataract. It is caused by the hardening and discoloration (yellowing) of the lens. This type of cataract forms deep in the central area, or nucleus of the lens. Over time, this type of cataract changes the eye's ability to focus.

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