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Night blindness
Night blindness A reduced ability to see in dim light. May be caused by a vitamin-A deficiency or glaucoma.
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Glaucoma
A disease of the eye marked by increased pressure within the eyeball. If left untreated, glaucoma can damage the optic nerve and cause loss of vision
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Night guard
Acrylic appliance used to prevent wear and temporomandibular damage caused by grinding or gnashing of the teeth during sleep.
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Nephrosis
A disease of the kidney that causes malfunction but no inflammation. Also called nephrotic syndrome.
Neurofibromatosis
An inherited disorder that causes dark spots on the skin and tumors of the skin, peripheral, optic and acoustic nerves.
Neurology
The branch of medicine that pertains to the nervous system.
Neuroma
A benign but sometimes painful tumor growing on a nerve.
Neutrophil
A mature white blood cell with a three- to five-lobed nucleus.
Night blindness
Nit
The egg of a louse.
Nocturia
Excessive urination at night.
Node
A swelling, knot or knob.
Nonunion
Failure of the ends of a broken bone to mend.
Nuclear scanning
An imaging procedure that views various parts of the body by injecting a very small dose of a radioactive substance into a vein.ÿ Different isotopes concentrate in different organs, and these concentrations are displayed.
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