river blindness definition
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Onchocerciasis Onchocerciasis, also known as river blindness and Robles disease, is a disease caused by infection with the parasitic worm Onchocerca volvulus. Symptoms include severe itching, bumps under the skin, and blindness. It is the second most common cause of blindness due to infection, after trachoma. The parasite worm is spread by the bites of a black fly of the Simulium type.
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Rivers Cliff (river cliff) A cliff is any steep slope that has been formed by natural processes. Cliffs reated by rivers are called river cliffs. They are on the outside of the curving section (meander) or a river and may be from a few metres to hundreds of metres high. Cliffs are formed when rivers cut swiftly into the land. Current. The flow of the river. Confluence. Where two rivers or streams meet.
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River Blindness River Blindness is listed as a rare disease by the Office of Rare Diseases (ORD) of the National Institutes of Health (NIH). This means that River Blindness, or a subtype of River Blindness, affects less than 200,000 people in the US population.
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Our Readers Want to Know: What Is the Difference Between Low Vision and Legal Blindness? Part 1 of the U.S. definition of legal blindness states this about visual acuity: A visual acuity of 20/200 or less in the better-seeing eye with best conventional correction (meaning with regular glasses or contact lenses).
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Visual Impairment Total blindness is the inability to tell light from dark, or the total inability to see. Visual impairment or low vision is a severe reduction in vision that cannot be corrected with standard glasses or contact lenses and reduces a person's ability to function at certain or all tasks.
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Reverse Color Blindness These toxins are very common solvents in many industries. Other toxins can induce color blindness like mercury or phthalates from food packaging, nail polish, plastic water bottles, etc. In addition to color blindness they may also be the cause of other symptoms like brain fog, dwindling memory and poor attention. The bottom line is you need to detoxify.
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- Transient Monocular Blindness, also called as Amaurosis Fugax is a condition in which there is abrupt loss of vision in one of your eyes due to a temporary lack of blood supply to your retina (light sensitive layer in your eye). Transient Monocular Visual Loss is mainly caused by lack of blood supply.
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What to Do for Severe Stomach Pain If you decide that you are not deathly ill, you are still faced with the fact that you are not well. 1  Here are are some steps to take: 2  Limit yourself to only clear liquids for a few hours. 3  If you experience vomiting and/or diarrhea, stick with the BRAT diet and other mild foods until your symptoms start to subside.
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- For other uses, see Blindness (disambiguation). Visual impairment, also known as vision impairment or vision loss, is a decreased ability to see to a degree that causes problems not fixable by usual means, such as glasses. Some also include those who have a decreased ability to see because they do not have access to glasses or contact lenses.
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color blindness Color blindness is an abnormal condition characterized by the inability to clearly distinguish different colors of the spectrum. The difficulties can be mild to severe. It is a misleading term because people with color blindness are not blind.
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Blindness The terms blind and blindness have been modified in our society to include a wide range of visual impairment. Blindness is frequently used today to describe severe visual decline in one or both eyes with maintenance of some residual vision.
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paralysis divergence paralysis A condition characterized by an inability of the eyes to diverge while all other monocular eye movements are unaffected. It is characterized by a sudden development of diplopia with marked esotropia at distance and sometimes headaches.
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Sex chromosome Color blindness, or color vision deficiency, is the inability or decreased ability to see color, or perceive color differences, under normal lighting conditions. Color blindness affects a significant percentage of the population.There is no actual blindness but there is a deficiency of color vision. The most usual cause is a fault in the development of one or more sets of retinal cones that perceive color in light and transmit that information to the optic nerve.This type of color blindness is usually a sex-linked condition.here is no actual blindness but there is a deficiency of color vision. The most usual cause is a fault in the development of one or more sets of retinal cones that perceive color in light and transmit that information to the optic nerve.
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Overview Wet macular degeneration is a chronic eye disease that causes blurred vision or a blind spot in your visual field. It's generally caused by abnormal blood vessels that leak fluid or blood into the macula (MAK-u-luh). The macula is in the part of the retina responsible for central vision. Wet macular degeneration is one of two types of age-related macular degeneration. The other type — dry macular degeneration — is more common and less severe. The wet type always begins as the dry type.
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Types of Flooding Riverine flooding. In riverine flooding, relatively high water levels overtop the natural or artificial banks of a stream or river. The nature of riverine flooding can vary significantly in terms of cause, timing and depth between different locations. Coastal rivers with short, steep headwaters often have floods that rise and recede quickly.
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Color Blindness Color Blindness. Color blindness, or color vision deficiency, is the inability or decreased ability to see color, or perceive color differences, under normal lighting conditions.There is no actual blindness.olor Blindness. Color blindness, or color vision deficiency, is the inability or decreased ability to see color, or perceive color differences, under normal lighting conditions.
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Blindness A blind individual is unable to see. In a strict sense the word blindness denotes the inability of a person to distinguish darkness from bright light in either eye. The terms blind and blindness have been modified in our society to include a wide range of visual impairment.
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Visual Impairment Legal blindness (which is actually a severe visual impairment) refers to a best-corrected central vision of 20/200 or worse in the better eye or a visual acuity of better than 20/200 but with a visual field no greater than 20° (e.g., side vision that is so reduced that it appears as if the person is looking through a tunnel).
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GCSE Rivers Glossary Drainage Basin: the land that is drained by a river and its tributaries. Erosion: the wearing away of the bed and banks of the river channel by abrasion, hydraulic action, solution and attrition. Estuary: the tidal mouth of a river, with large, flat expanses of mud exposed at low tide.
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Color vision deficiency Color vision deficiency (sometimes called color blindness) represents a group of conditions that affect the perception of color. Red-green color vision defects are the most common form of color vision deficiency. Affected individuals have trouble distinguishing between some shades of red, yellow, and green.
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- foreseeable meaning, foreseeable definition | English Cobuild dictionary. foreseeable. 1 adj If a future event is foreseeable, you know that it will happen or that it can happen, because it is a natural or obvious consequence of something else that you know.
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Key Definitions of Statistical Terms Legal blindness is a level of vision loss that has been legally defined to determine eligibility for benefits. The clinical diagnosis refers to a central visual acuity of 20/200 or less in the better eye with the best possible correction, and/or a visual field of 20 degrees or less. Often, people who are diagnosed with legal blindness still have some useable vision.
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Color Blindness Color blindness (or, more accurately, color vision deficiency) is an inherited condition that affects males more frequently than females. According to Prevent Blindness America, an estimated 8 percent of males and less than 1 percent of females have color vision problems.
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Amblyopia Amblyopia (from Greek αμβλυωπία, blunt vision), also called lazy eye, is a disorder of sight. It results in decreased vision in an eye that otherwise appears normal, or out of proportion to associated structural problems of the eye. Whenever the brain does not receive visual signals from an eye for a long period of time, there is a risk of amblyopia. It also can occur when the brain turns off the visual processing of one eye to prevent double-vision, for example in strabismus (crossed eyes). The cause of amblyopia is within the brain.
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Severe Weather 101 Severe Weather 101. River flooding occurs when water levels rise over the top of river banks due to excessive rain from tropical systems making landfall, persistent thunderstorms over the same area for extended periods of time, combined rainfall and snowmelt, or an ice jam.
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- Helicopter carrying British aid across flood water, Mozambique. 1  A steep-sided channel-a river channel surrounded by steep slopes causes fast surface run-off surface run-off: The water that runs over the surface of the land when the soil is unable to absorb it. .