Microphthalmus
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  Microphthalmus



Microphthalmus

    A congenital problem in which the eye(s) is (are) smaller than normal. Vision is often reduced because other problems present within such an eye. No treatment is available.

RELATED TERMS
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Congenital
Present at birth.

Vision
The sense of sight.

Eye
The organ of sight. The eye has a number of components. These components include but are not limited to the cornea, iris, pupil, lens, retina, macula, optic nerve, choroid and vitreous.



SIMILAR TERMS
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Micrainin
Micrainin 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): aspirin; meprobamate.

Micro-k
Micro-k 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): potassium chloride.

Micro-k 10
Micro-k 10 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): potassium chloride.

Micro-k ls
Micro-k ls 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): potassium chloride.

Microalbumin
Small amounts of protein in the urine that cannot be detected by the usual "dipstick" test done for routine urinanalysis testing for other reasons. Specialized dipsticks, or urine collections over a period of 12-24 hours, are used to measure the amount of microalbumin. If there is persistent microalbumin over several repeated tests at different times, the risk of diabetic nephropathy and macrovascular disease are both higher.

Microaneurysm
A small swelling that forms on the side of tiny blood vessels. These small swellings may break and bleed into nearby tissue. People with diabetes sometimes get microaneurysms in the retina of the eye.

Microangiopathy
See: Angiopathy.

Microbe
Microscopic organism, especially one that transmits a disease.

Microbiology
The study of living microbes, including bacteria, protozoa and molds.

Microcannula
A hair-thin glass tube so small that it can penetrate a single cell and deliver a minute drop of a liquid substance to the cell.

Microcephaly
A small skull with small cranial capacity. Usually indicates mental retardation.

Microcomedo
The first stage of comedo formation; a comedo so small that it can be seen only with a microscope.

Microcyst
A tiny cyst, frequently of such dimensions that a magnifying lens or microscope is required for observation.

Microderm
Microderm 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): chlorhexidine gluconate.

Microelectrode
An electrode made of a filament so hair-thin that it can penetrate a single cell, such as a nerve cell, and deliver to or receive from the cell a minute amount of electrical current.

Microelectrodes
Electrodes with an extremely small tip, used in a voltage clamp or other apparatus to stimulate or record bioelectric potentials of single cells intracellularly or extracellularly.

Microencephaly
Having an abnormally small brain.

Microgestin fe 1-20
Microgestin fe 1-20 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): ethinyl estradiol; norethindrone acetate.

Microgestin fe 1.5-30
Microgestin fe 1.5-30 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): ethinyl estradiol; norethindrone acetate.

Micrographia
A change in handwriting with the script becoming smaller and more cramped.

Microhepatia
A small liver.

Microlite
Microlite 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): technetium tc-99m albumin colloid kit.

Micromelia
A birth defect in which arms or legs are abnormally short.

Micronase
Micronase 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): glyburide.

Micronor
Micronor 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): norethindrone.

Micronutrient
Vitamins and minerals that have no caloric value and little direct impact on hormonal response.

Microorganism
An organism that can be seen only under a microscope. Categories of microorganisms include Algae, Bacteria, Fungi, Protozoa, Viruses, or Subviral Agents. Also referred to as microbe.

Micropenis
A birth defect in which the penis is extremely small. The maximum stretched length is not greater than .5 standard deviation units (SDU) below the mean for age, and possibly as small as 5.0 SDU below. The diameter is correspondingly small, with extreme hypoplasia of the corpora cavernosa. As compared with a micropenis, the average adult penis's stretched length is 6.6 inches (16.7 cm), with a standard deviation of 0.77 inches ([1.95 cm) (Money, Lehne, and Pierre-Jerome, 1984) an exceptionally small penis that resembles the clitoris in size. A micropenis may carry the urethral tube or may be hypospadiac. Typically, it is formed mostly of skin, the body (corpora cavernosa) of the penis being hypoplastic. The condition is also known as microphallus or penile agenesis.

Microphallus
See micropenis.

Micropsia
The visual perception that objects are smaller than they actually are.

Microscope
A microscope (Greek: micron = small and scopos = aim) is an instrument for viewing objects that are too small to be seen by the naked or unaided eye. The science of investigating small objects using such an instrument is called microscopy, and the term microscopic means minute or very small, not easily visible with the unaided eye. In other words, requiring a microscope to examine.

Microscopy
Investigation of minute objects by means of a microscope.

Microspectrophotometry (MSP)
A procedure that involves the passage of a narrow measuring beam through the outer segments of individual photoreceptors to measure absorbance spectra in excised retinas.

Microsul
Microsul 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): sulfamethizole.

Microsurgery
Precise, delicate surgery performed to unblock Fallopian tubes or to reverse a vasectomy or tubal ligation.

Microvascular Disease
Disease of the smallest blood vessels that sometimes occurs when a person has had diabetes for a long time. The walls of the vessels become abnormally thick but weak, and therefore they bleed, leak protein, and slow the flow of blood through the body. Then some cells, for example, the ones in the center of the eye, may not get enough blood and may be damaged.

Microzide
Microzide 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): hydrochlorothiazide.



PREVIOUS AND NEXT TERMS
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Mianserin
An antidepressant substance.

Metharbital
An anticonvulsant.

Medazepam
A tranquilizer.

Maprotyline
An antidepressant.

Macula
A specialized part of the retina containing mostly cones. The macula is used for all detailed visual tasks. The center of the macula is called the fovea. If a disease process harms or destroys the macula, vision is usually reduced to 20/200 (legal blindness).

Microphthalmus

Mydriatic
A drug that dilates the pupil (see cycloplegia). Sometimes used to treat amblyopia, particularly if the child will not wear an eye patch over the stronger eye.

Mayo Clinic
The Mayo Clinic is a world-renowned medical practice operated by the Mayo Foundation, a not-for-profit organization based in Rochester, Minnesota. The first and largest facilities of the Mayo Clinic are also located in Rochester, but it also runs additional hospitals in Jacksonville, Florida and Scottsdale, Arizona. In addition, the Mayo Foundation operates a number of smaller clinics and hospitals in Minnesota, Iowa, and Wisconsin.

Mayo Clinic diet
A nutritional diet developed by the prestigious Mayo Clinic.

Mammography
An X-ray procedure using a special low irradiation technique to detect abnormal change in breast tissue. Its main use is to detect breast lumps that are too small to be found during breast self examination or physical examination. The higher the level of estrogen (and possibly progestin) the more dense breast tissue is and the less likely that a mammogram will see abnormal tissue. It has many false positive readings meaning that there is no cancer yet the test was abnormal.

Motor neuron disease
Diseases characterized by a selective degeneration of the motor neurons of the spinal cord, brainstem, or motor cortex. Clinical subtypes are distinguished by the major site of degeneration. In amyotrophic lateral sclerosis there is involvment of upper, lower, and brainstem motor neurons. In progressive muscular atrophy and related syndromes the motor neurons in the spinal cord are primarily affected. With progressive bulbar palsy, the initial degeneration occurs in the brainstem. In primary lateral sclerosis, the cortical neurons are affected in isolation.

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