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Where is the first cataract?
Aswan CityThe 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.
Where is the second cataract located?
Lake NasserThe Second Cataract (or Great Cataract) was in Nubia and is now submerged under Lake Nasser. (21.48°N 30.97°E)
What region is located between the first and second cataracts?
Lower Nubia was the northern part of the region, located between the second and the first cataract of Aswān; this was called Wawat.
Where are the six cataracts?
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.
How long does it take for your vision to improve after-cataract surgery?
After surgery, your eye may feel scratchy, sticky, or uncomfortable. It may also water more than usual. Most people see better 1 to 3 days after surgery. But it could take 3 to 10 weeks to get the full benefits of surgery and to see as clearly as possible.
Are you at risk for a secondary cataract?
Who's at risk? There's no way to predict whether cataract surgery will trigger secondary cataracts. However, certain circumstances make people more likely to experience the side effect, such as being younger than 60 at the time of cataract surgery or having already had glaucoma or retina surgery.
What are the 3 types of cataracts?
There are three primary types of cataracts: nuclear sclerotic, cortical and posterior subcapsular.
How many times can you get cataract surgery?
Cataract surgery is irreversible. This is because the cloudy natural lens that results in a cataract is removed during surgery and cannot be placed back in.
What are the 3 types of cataract surgery?
Types of cataract surgeryi) Phacoemulsification. Also known as 'Phaco', it is the most common technique used for cataract removal nowadays. ... ii) Extracapsular cataract surgery. ... iii) Intracapsular cataract surgery.
How is cataract surgery done?
Cataract removal: Your provider uses a special microscope to see your eye. They create tiny incisions to reach the lens. Then they use ultrasound waves to break up the lens and remove it. Finally, they place the new lens.
Where did the Egyptians come from?
Most Egyptians were probably descended from settlers who moved to the Nile valley in prehistoric times, with population increase coming through natural fertility. In various periods there were immigrants from Nubia, Libya, and especially the Middle East.
What is a cataract in the eye?
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.
What does a secondary cataract look like?
Secondary cataract is associated with symptoms similar to primary cataract, such as: Lack of visual acuity that hinders near and far vision and can affect one or both eyes. Blinding, especially with frontal lights at night. Difficulty in the perception of colors.
How is a secondary cataract removed?
How are secondary cataracts treated? The only treatment to eradicate secondary cataracts is a YAG laser capsulotomy. The YAG laser capsulotomy is a simple outpatient procedure and is completed in a clinic in as little as a few minutes.
Can you get a second cataract in the same eye?
So, it is actually impossible to get another cataract. All of that said, there is a secondary condition that can occur after cataract surgery that has extremely similar symptoms. This is often called after-cataract but is medically referred to as a posterior capsular opacity.
What does other secondary cataract mean?
A secondary cataract, also known posterior capsule opacifcation, is the most common complication after cataract surgery. It happens in 3-50% of cases five years after cataract surgery, and is a result of the migration and proliferation of the epithelial cells that lead to reduced visual acuity.
When do cataracts develop?
Most cataracts develop as we age. Although signs can be seen as early as your 40s to 50s, cataracts usually do not become significant until the late 60s or 70s.
Why do cataracts appear early in life?
Cataracts may develop as a result of aging or may appear early in life. Different portions of the lens may be affected more than others. Eye doctors classify cataracts according to their location and origin. Science Photo Library / Getty Images.
Why do cataracts form?
14 This type of cataract may be caused by exposure to ultraviolet light from the sun and other forms of radiation.
What causes cataracts in the eye?
Traumatic Cataract. Cataracts sometimes result from direct injury or trauma to the eye. 11 Cataracts may develop immediately or years after an event that damages the eye. Traumatic cataracts often occur after blunt trauma to the eye or from exposure to certain chemicals. 12 .
What is the name of the part of the lens that is cloudy?
Cortical Cataract. A cortical cataract generally appears as a cloudy opacity in the part of the lens called the cortex. 4 The cortex consists of the peripheral, or outer part, of the lens. These cataracts often resemble wheel spokes that point inward toward the center of the lens.
What is the most common type of age related cataract?
A nuclear sclerotic cataract is the most common type of age-related cataract. 2 This type of cataract causes gradual yellow cloudiness and hardening of the central part of the lens called the nucleus. Changes in vision are usually gradual.
Where is posterior subcapsular cataract?
Often referred to as a PSC, a posterior subcapsular cataract is an opacity that develops on the back surface of the lens, directly underneath the lens capsular bag that houses the lens. 6
Where did the word "cataract" come from?
The word "cataract" comes from the Greek word καταρρέω ("to flow down"), although the original Greek term was the plural-only Κατάδουποι. However, contrary to this, none of the Nile 's six primary cataracts could be accurately described as waterfalls, and given a broader definition, this is the same with many of the minor cataracts.
Where is the 4th cataract?
(. / 18.91; 32.36 ( Fourth Cataract) The Fifth Cataract is near the confluence of the Nile and Atbarah Rivers.
How many cataracts are there in the Nile River?
The six cataracts of the Nile. 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 did the Nile have cataracts?
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.
Who was the first person to see the six cataracts of the Nile?
The six cataracts of the Nile are depicted extensively by European visitors, notably by Winston Churchill in The River War (1899), where he recounts the exploits of the British trying to return to the Sudan between 1896 and 1898, after they were forced to leave in 1885 .
Who gave a precise description of the cataract-nile?
Eratosthenes gave a precise description of the Cataract-Nile:
Why are some of the cataracts in the canyon impassable?
Despite these characteristics, some of the cataracts which are normally impassable by boat because of the shallow water have become navigable during the flood season.
Where is the nucleus of a cataract located?
A nuclear cataract is located in the center of the lens. The nucleus tends to darken with age, changing from clear to yellow and sometimes brown.
What is a cataract?
Cataract. A cataract is a cloudy or opaque area in the normally clear lens of the eye. Depending upon its size and location, it can interfere with normal vision. Most cataracts develop in people over age 55, but they occasionally occur in infants and young children or as a result of trauma or medications. Usually, cataracts develop in both eyes, ...
How does cataract surgery work?
Two approaches to cataract surgery are generally used: Small-incision cataract surgery involve s making an incision in the side of the cornea (the clear outer covering of the eye) and inserting a tiny probe into the eye. The probe emits ultrasound waves that soften and break up the lens so it can be suctioned out .
Why do cataracts become cloudy?
Most cataracts are due to age-related changes in the lens of the eye that cause it to become cloudy or opaque. However, other factors can contribute to cataract development, including: Diabetes mellitus. People with diabetes are at higher risk for cataracts. Drugs.
What is the outermost layer of a cataract?
Types of cataracts. The lens is composed of layers, like an onion. The outermost is the capsule. The layer inside the capsule is the cortex, and the innermost layer is the nucleus. A cataract may develop in any of these areas. Cataracts are named for their location in the lens:
What happens if a close relative has cataracts?
Family History. If a close relative has had cataracts, there is a higher chance of developing a cataract.
Can vitamin C help with cataracts?
Nutritional deficiency. Although the results are inconclusive, studies suggest an association between cataract formation and low levels of antioxidants (for example, vitamin C, vitamin E, and carotenoids). Further studies may show that antioxidants can help decrease cataract development.
What age do cataracts start?
Around age 40, the proteins in the lens of your eye start to break down and clump together. This clump makes a cloudy area on your lens — or a cataract. Over time, the cataract gets more severe and clouds more of the lens. Learn more about what causes cataracts.
What are cataracts?
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.
What are the symptoms of cataracts?
You might not have any symptoms at first, when cataracts are mild. But as cataracts grow, they can cause changes in your vision. For example, you may notice that:
How will my eye doctor check for cataracts?
An eye doctor can check for cataracts as part of a dilated eye exam. The exam is simple and painless — your doctor will give you some eye drops to dilate (widen) your pupil and then check your eyes for cataracts and other eye problems.
What is the best way to remove cataracts?
Surgery. Your doctor might suggest surgery if your cataracts start getting in the way of everyday activities like reading, driving, or watching TV. During cataract surgery, the doctor removes the clouded lens and replaces it with a new, artificial lens (also called an intraocular lens, or IOL). This surgery is very safe, and 9 out of 10 people who get it can see better afterwards.
How to get cataracts checked?
See your doctor for regular check-ups. Ask your doctor about the benefits and risks of cataract surgery. Encourage family members to get checked for cataracts, since they can run in families.
What are the risks of getting cataracts?
You’re also at higher risk if you: Have certain health problems, like diabetes. Smoke. Drink too much alcohol. Have a family history of cataracts. Have had an eye injury, eye surgery, or radiation treatment on your upper body. Have spent a lot of time in the sun.
Where do cataracts form?
How a cataract forms. The lens, where cataracts form, is positioned behind the colored part of your eye (iris). The lens focuses light that passes into your eye, producing clear, sharp images on the retina — the light-sensitive membrane in the eye that functions like the film in a camera.
What is a cataract in the right eye?
Overview. 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. Normal vision (left) becomes blurred as a cataract forms (right). A cataract is a clouding of the normally clear lens of your eye.
What is the name of the cataract that affects the back of the eye?
Cataracts that affect the back of the lens (posterior subcapsular cataracts). A posterior subcapsular cataract starts as a small, opaque area that usually forms near the back of the lens, right in the path of light. A posterior subcapsular cataract often interferes with your reading vision, reduces your vision in bright light, and causes glare or halos around lights at night. These types of cataracts tend to progress faster than other types do.
How does cataract affect vision?
How a cataract affects your vision. Normal vision (left) becomes blurred as a cataract forms (right). A cataract is a clouding of the normally clear lens of your eye. For people who have cataracts, seeing through cloudy lenses is a bit like looking through a frosty or fogged-up window. Clouded vision caused by cataracts can make it more difficult ...
Why is my cataract turning brown?
As the cataract slowly progresses, the lens may even turn brown. Advanced yellowing or browning of the lens can lead to difficulty distinguishing between shades of color. Cataracts that affect the edges of the lens (cortical cataracts).
How do you know if you have cataracts?
Symptoms. Signs and symptoms of cataracts include: At first, the cloudiness in your vision caused by a cataract may affect only a small part of the eye's lens and you may be unaware of any vision loss. As the cataract grows larger, it clouds more of your lens and distorts the light passing through the lens.
What is a cortical cataract?
A cortical cataract begins as whitish, wedge-shaped opacities or streaks on the outer edge of the lens cortex. As it slowly progresses, the streaks extend to the center and interfere with light passing through the center of the lens. Cataracts that affect the back of the lens (posterior subcapsular cataracts).
Filming at the Old Cataract Hotel
We are introduced to the white walls and domed roof of the Old Cataract Hotel soon after Death On The Nile’s opening credits roll. Footage of the hotel we see in the movie actually took place at Longcross Studios in Chertsey, England. It isn’t real!
Where Agatha Christie wrote her famous novel
Although the pink granite walls of the Sofitel Legend Old Cataract Hotel aren’t seen in the film, the inspiration is deeply rooted.
A trip to the Old Cataract Hotel
Renovated in 2011, the 19th century Victorian Palace now offers restaurants, bars, swimming pools and a spa.
