Cataract
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  Cataract



Cataract

    Opacity or cloudiness of the crystalline lens, which may prevent a clear image from forming on the retina. Surgical removal of the lens may be necessary if visual loss becomes significant, with lost optical power replaced with an intraocular lens, contact lens, or aphakic spectacles. May be congenital or caused by trauma, disease, or age.

RELATED TERMS
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Lens
The lens of the eye is like an adjustable lens of a camera and focuses light rays on to the retina for sharp images. A condition called presbyopia occurs when the lens is no longer able to adjust for objects at different distances.

Retina
A membrane lining the inside of the back of the eye that contains light-sensitive nerve cells that convert focused light into nerve impulses, making vision possible.

Optical
Having to do with vision.

Congenital
Present at birth.

Trauma
Injury caused by external force, chemical, temperature extremes, or poor tooth alignment.

Disease
Illness or sickness often characterized by typical patient problems (symptoms) and physical findings (signs). Disruption sequence: The events that occur when a fetus that is developing normally is subjected to a destructive agent such as the rubella (German measles) virus.



SIMILAR TERMS
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Catabolism
The energy-burning aspect of metabolism.

Cataflam
A medicine used in the treatment of the signs and symptoms of osteoarthritis and rheumatoid arthritis.

Catalca Devlet ve Bolge Trafik Hastanesi
The Catalca Devlet ve Bolge Trafik Hastanesi is a hospital in Istanbul, Turkey.

Catalepsy
Waxy flexibility--rigid maintenance of a body position over an extended period of time.

Catalysis
The process by which a substance speeds up a chemical reaction without being consumed or altered in the process. Substances that can accomplish this remarkable feat are termed catalysts and are of immense importance in chemistry and biology.

Catalyst
A substance that speeds up a chemical reaction but is not consumed or altered in the process. Catalysts are of immense importance in chemistry and biology.

Catamarca doctors
All doctors near Catamarca, Argentina. Doctors who can assist a patient in Catamarca.

Catamenia
Menstruation.

Catania doctors
All doctors near Catania, Italy. Doctors who can assist a patient in Catania.

Catanzaro doctors
All doctors near Catanzaro, Italy. Doctors who can assist a patient in Catanzaro.

Cataplasm
A poultice or plaster. A soft moist mass, often warm and medicated, that is spread over the skin to treat an inflamed, aching or painful area, to improve the circulation, etc. From the Greek kataplasma, poultice, from kataplasso, to spread over.

Cataplexy
Episodes of sudden bilateral loss of muscle tone resulting in the individual collapsing, often in association with intense emotions such as laughter, anger, fear, or surprise.

Catapres
Catapres is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): clonidine hydrochloride.

Catapres-tts-1
Catapres-tts-1 is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): clonidine.

Catapres-tts-2
Catapres-tts-2 is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): clonidine.

Catapres-tts-3
Catapres-tts-3 is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): clonidine.

Cataract surgery
Removal of the clouded lens (the cataract) in its entirety by surgery, usually followed by replacement of the lens with an intraocular lens (IOL) made of plastic, silicone, acrylic or other material. The operation typically takes about an hour, is done under local anesthetic only, and does not require hospitalization.

Cataract with poikiloderma atrophicans
Also known as the Rothmund-Thomson syndrome, this is an hereditary disease characterized by progressive degeneration (atrophy), scarring and abnormal pigmentation of the skin together with stunting of growth, baldness, cataracts, depressed nasal bridge, and malformations of the teeth, nails and bone.

Cataract, nuclear
A cataract that occurs in the center (the nucleus) of the lens.

Cataract, primary
A cataract that develops independently of other diseases. A primary cataract is in contrast to a secondary cataract, one that is secondary to another disease.

Cataract, secondary
A cataract that develops secondary to another disease or surgery. The other disease may, for example, be glaucoma or retinal detachment. A secondary cataract is in contrast to a primary cataract, one that develops independently of any other disease.

Cataract, supranuclear
A cataract just above the center (the nucleus) of the lens.

Cataracts
Partial or complete opacity on or in the lens or capsule of one or both eyes, impairing vision or causing blindness. The many kinds of cataract are classified by their morphology (size, shape, location) or etiology (cause and time of occurrence).

Catarase
Catarase is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): chymotrypsin.

Catarrh
Inflammation of a mucous membrane with free discharge.

Catatonia
A psychiatric syndrome of being immobile and unresponsive to sensory stimuli, but not unaware of them.

Catatonic
1. Characterized by marked motor abnormalities including immobility (catalepsy or stupor), excessive motor activity (purposeless agitation), extreme negativism, mutism, posturing or stereotyped movements, echolalia, and/or echopraxia.2. A person with catatonia or catatonic schizophrenia.

Catatonic behavior
Marked motor abnormalities including motoric immobility (i.e., catalepsy or stupor), certain types of excessive motor activity (apparently purposeless agitation not influenced by external stimuli), extreme negativism (apparent motiveless resistance to instructions or attempts to be moved) or mutism, posturing or stereotyped movements, and echolalia or echopraxia.

Catawba Memorial Hospital
The Catawba Memorial Hospital is a hospital in Hickory, North Carolina, United States.



PREVIOUS AND NEXT TERMS
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Colon
Another name for the large intestine. The section of the large intestine extending from the cecum to the rectum. An adult colon is approximately five to six feet in length and is responsible for absorbing water and forming, storing and expelling waste.

Cancer
Any malignant growth or tumor caused by abnormal and uncontrolled cell division; it may spread to other parts of the body through the lymphatic system or the blood stream.

Coronary thrombosis
Thrombosis is the formation of a clot or thrombus inside a blood vessel, obstructing the flow of blood through the circulatory system. Thromboembolism is a general term describing both thrombosis and its main complication: dislodgement of a clot and embolisation.

Cystitis
Bladder infection. Cystitis is considered as benign if it is not associated with an upper urinary tract infection or pyelonephritis, although it is often painful and uncomfortable (burning sensation when urinating). Cystitis may recur and this must be taken into account, particularly in the event of pregnancy, when urinary stasis is common.

Chronic Fatigue Syndrome (CFS)
Chronic Fatigue Syndrome is a chronic illness that affects many body systems and their functions, particularly the nervous and immune systems. The illness can cause extreme fatigue, muscle pain, memory loss and poor concentration.

Cataract

Carpal Tunnel Syndrome
Swelling of the tendons which pass through the wrist and compress the median nerve. Symptoms include pain, numbness and tingling in the hands, primarily the first three fingers and thumb. Symptoms may also appear in the wrist and forearm. CTS symptoms may even wake a person at night.

Celiac Disease
Is a hereditary disorder involving an intolerance to gluten, a protein found in wheat and rye flours. Symptoms include a failure to grow and the passage of fatty, foul-smelling stools that float to the top of the toilet water. The disorder often can be diagnosed on the basis of symptoms and confirmed by examining a small sample of intestinal tissue. As the disease progresses, the fingerlike projections that line the intestinal walls, and from which nutrients are absorbed into the bloodstream, become flattened and smooth. Treatment involves consuming a gluten-free diet.

Cerebral palsy
A variety of disorders resulting from damage to the brain before or during birth or in the first few years of life. Extent of motor involvement varies greatly, from a sight limp or as profound as paralysis, spasticity or speech problems, as well as associated disorders of learning problems, sensory deficits, convulsive and behavioral disturbances of organic origin.

Chronic pain
Chronic pain is medically defined as pain that has lasted 6 months or longer.This constant or intermittent pain has often outlived its purpose, as it does not help the body to prevent injury.It is often more difficult to treat than acute pain.

Colour blindness
The inability to perceive differences between some or all colors that other people can distinguish. It is most often of genetic nature, but might also occur because of eye, nerve, or brain damage, or due to exposure to certain chemicals.

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