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| This glossary contains: 19186 medical terms |
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Eyedrop test
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Eyedrop testThere are many types of eyedrops and many types of eyedrop tests. One of the most common eyedrop tests is pupil dilation. This examination enables your eye care professional to see more of your retina, the light-sensitive layer of tissue at the back of your eye.
RELATED TERMS--------------------------------------
Pupil
A circular opening in the center of the iris. The size of the pupil changes according to the amount of light present. It is small in sunlight and large in a dark room.
Dilation
The opening of the cervix during labor.
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.
Tissue
Biological tissue is a group of cells that perform a similar function.The study of tissues is known as histology, or, in connection with disease, histopathology.The classical tools for studying the tissues are the wax block, the tissue stain, and the optical microscope, though developments in electron microscopy, immunofluorescence, and frozen sections have all added to the sum of knowledge in the last couple of decades.
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--------------------------------------
PREVIOUS AND NEXT TERMS--------------------------------------
Eye color
The color of the iris. The genetics of eye color are complicated. Eye color is polygenic. It is determined by multiple genes. The eye color genes include EYCL1 (a green/blue eye color gene located on chromosome 19), EYCL2 (a brown eye color gene) and EYCL3 (a brown/blue eye color gene located on chromosome 15). There are clearly other genes that influence eye color. The once-held view that blue eye color is a simple recessive trait has been shown to be wrong. The genetics of eye color are so complex that almost any parent-child combination of eye colors can occur.
Eye pressure test
A standard eye test that determines the fluid pressure inside the eye. The test is called tonometry.Increased pressure within the eye is a possible sign of glaucoma, a common and potentially very serious eye problem if it is not detected and treated promptly. It is recommended that adults over age 40 have tonometry for glaucoma every 3 to 5 years by having their eye pressures measured.
Eye, absent
Also called anophthalmia, a congenital malformation (birth defect) of the globe. Anophthalmia refers, strictly speaking, to absence of the globe and ocular tissue from the orbit. However, in most cases of anophthalmia, CT scans show some remnants of the globe, indicating they represent severe microphthalmia (small eyes).
Eye, no
Also called anophthalmia, a congenital malformation (birth defect) of the globe. Anophthalmia refers, strictly speaking, to absence of the globe and ocular tissue from the orbit. However, in most cases of anophthalmia, CT scans show some remnants of the globe, indicating they represent severe microphthalmia (small eyes).
Eye, small
Also called microphthalmia, an abnormally small eye, a congenital malformation (birth defect) of the globe. The related term "anophthalmia" means no eye and refers to absence of the globe and ocular tissue from the orbit.
Eyedrop test
Eyelash
One of the familiar stiff hairs that project from the margin of the eyelid. Eyelashes tend to be noticed mainly when something goes wrong with them. An eyelash gets in your eye and irritates it; you have an ingrown eyelash; your eyelashes fall out, etc.
Eyelid
The lid or cover of the eye, a movable fold of skin and muscle that can be closed over the eyeball or opened at will. Each eye has an upper and a lower lid. An eyelid is also called a palpebra.
Eyelid myokymia
Fine continuous contractions of the eyelid muscle, typically involving one of the lower eyelids, less often an upper eyelid. The condition occurs spontaneously, sometimes triggered by stress, fatigue, caffeine or alcohol. In most cases, the condition is benign and ceases of its own accord.
Eyelids, adult ptosis of the
Drooping of the upper eyelids in adults, most commonly due to separation of the tendon of the lid-lifting (levator) muscle from the eyelid. This may occur with age, after cataract or other eye surgery, an injury, eye tumor or a complication of other diseases involving the levator muscle or its nerve supply, such as diabetes. If treatment is necessary, it is usually surgical. Sometimes a small tuck in the lifting muscle and eyelid can raise the lid sufficiently. More severe ptosis requires reattachment and strengthening of the levator muscle.
Eyelids, congenital ptosis of the
Drooping of the upper eyelids at birth. The lids may droop only slightly or they may cover the pupils and restrict or even block vision. Moderate or severe pstosis calls for treatment to permit normal vision development. If not corrected, amblyopia ("lazy eye") may develop which can lead to permanently poor vision. Ptosis at birth is often caused by poor development of the levator muscle which lifts the eyelid. Children with ptosis may tip their heads back into a chin-up position to see underneath the eyelids or raise their eyebrows in an attempt to lift up the lids. Congenital ptosis rarely improves with time. Mild or moderate ptosis usually does not require surgery early in life. Treatment is usually surgery to tighten the eyelid-lifting muscles, the levators. If the levator is very weak, the lid can be attached or suspended from under the eyebrow so that the forehead muscles can do the lifting. Even after surgery, focusing problems can develop as the eyes grow and change shape. All children with ptosis, whether they have had surgery or not, should therefore be followed by an ophthalmologist.
RELATED TERMS--------------------------------------
Pupil
A circular opening in the center of the iris. The size of the pupil changes according to the amount of light present. It is small in sunlight and large in a dark room.
Dilation
The opening of the cervix during labor.
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.
Tissue
Biological tissue is a group of cells that perform a similar function.The study of tissues is known as histology, or, in connection with disease, histopathology.The classical tools for studying the tissues are the wax block, the tissue stain, and the optical microscope, though developments in electron microscopy, immunofluorescence, and frozen sections have all added to the sum of knowledge in the last couple of decades.
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--------------------------------------
PREVIOUS AND NEXT TERMS--------------------------------------
Eye color
The color of the iris. The genetics of eye color are complicated. Eye color is polygenic. It is determined by multiple genes. The eye color genes include EYCL1 (a green/blue eye color gene located on chromosome 19), EYCL2 (a brown eye color gene) and EYCL3 (a brown/blue eye color gene located on chromosome 15). There are clearly other genes that influence eye color. The once-held view that blue eye color is a simple recessive trait has been shown to be wrong. The genetics of eye color are so complex that almost any parent-child combination of eye colors can occur.
Eye pressure test
A standard eye test that determines the fluid pressure inside the eye. The test is called tonometry.Increased pressure within the eye is a possible sign of glaucoma, a common and potentially very serious eye problem if it is not detected and treated promptly. It is recommended that adults over age 40 have tonometry for glaucoma every 3 to 5 years by having their eye pressures measured.
Eye, absent
Also called anophthalmia, a congenital malformation (birth defect) of the globe. Anophthalmia refers, strictly speaking, to absence of the globe and ocular tissue from the orbit. However, in most cases of anophthalmia, CT scans show some remnants of the globe, indicating they represent severe microphthalmia (small eyes).
Eye, no
Also called anophthalmia, a congenital malformation (birth defect) of the globe. Anophthalmia refers, strictly speaking, to absence of the globe and ocular tissue from the orbit. However, in most cases of anophthalmia, CT scans show some remnants of the globe, indicating they represent severe microphthalmia (small eyes).
Eye, small
Also called microphthalmia, an abnormally small eye, a congenital malformation (birth defect) of the globe. The related term "anophthalmia" means no eye and refers to absence of the globe and ocular tissue from the orbit.
Eyedrop test
Eyelash
One of the familiar stiff hairs that project from the margin of the eyelid. Eyelashes tend to be noticed mainly when something goes wrong with them. An eyelash gets in your eye and irritates it; you have an ingrown eyelash; your eyelashes fall out, etc.
Eyelid
The lid or cover of the eye, a movable fold of skin and muscle that can be closed over the eyeball or opened at will. Each eye has an upper and a lower lid. An eyelid is also called a palpebra.
Eyelid myokymia
Fine continuous contractions of the eyelid muscle, typically involving one of the lower eyelids, less often an upper eyelid. The condition occurs spontaneously, sometimes triggered by stress, fatigue, caffeine or alcohol. In most cases, the condition is benign and ceases of its own accord.
Eyelids, adult ptosis of the
Drooping of the upper eyelids in adults, most commonly due to separation of the tendon of the lid-lifting (levator) muscle from the eyelid. This may occur with age, after cataract or other eye surgery, an injury, eye tumor or a complication of other diseases involving the levator muscle or its nerve supply, such as diabetes. If treatment is necessary, it is usually surgical. Sometimes a small tuck in the lifting muscle and eyelid can raise the lid sufficiently. More severe ptosis requires reattachment and strengthening of the levator muscle.
Eyelids, congenital ptosis of the
Drooping of the upper eyelids at birth. The lids may droop only slightly or they may cover the pupils and restrict or even block vision. Moderate or severe pstosis calls for treatment to permit normal vision development. If not corrected, amblyopia ("lazy eye") may develop which can lead to permanently poor vision. Ptosis at birth is often caused by poor development of the levator muscle which lifts the eyelid. Children with ptosis may tip their heads back into a chin-up position to see underneath the eyelids or raise their eyebrows in an attempt to lift up the lids. Congenital ptosis rarely improves with time. Mild or moderate ptosis usually does not require surgery early in life. Treatment is usually surgery to tighten the eyelid-lifting muscles, the levators. If the levator is very weak, the lid can be attached or suspended from under the eyebrow so that the forehead muscles can do the lifting. Even after surgery, focusing problems can develop as the eyes grow and change shape. All children with ptosis, whether they have had surgery or not, should therefore be followed by an ophthalmologist.
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This dictionary contains 19186 terms.
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