Cataract, nuclear

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Cataract, nuclear

Cataract, nuclear

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

RELATED TERMS
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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.

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.

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
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.

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, 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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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.

Catamenia
Menstruation.

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.

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

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.

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.

Catechol-O-methyltransferase
COMT. An enzyme that catalyzes the degradation of catecholamines, including the neurotransmitters dopamine, epinephrine, and norepinephrine. COMT is also important in the metabolism of catechol drugs used in the treatment of hypertension, asthma, and Parkinson disease. A genetic polymorphism (a common normal variant) in COMT contributes to the responses to pain and stress.

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