Lacrimal sac
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  Lacrimal sac



Lacrimal sac

    The tear sac located on the side of the nose adjacent to the inner corner of the eye. Tears normally drain from the eye into the tear duct and then through the sac, finally leaving by a drain which enters the nose. The tear sac remains filled with tears when an infant has a blocked tear duct. An infection of the tear sac is called a dacryocystitis.

RELATED TERMS
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Adjacent
Lying nearby. Related terms include superjacent, subjacent, and circumjacent. From ad-, near + the Latin jacere, to lie = to lie near.

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.

Drain
A device for removing fluid from a cavity or wound. A drain is typically a tube or wick.

Duct
A channel or passage through which fluids move.

Sac
"Pouch; a bag-like structure."

Infant
A child under a year of age.

Infection
Anything that invades the body and reproduces. Infections can be bacteria, protozoa, fungi, or viruses. Bacteria and fungi are one celled creatures that cause many infections including strep throat, bladder infections, and some lung infections. Fungi cause “athlete’s foot” and thrush, an infection in the mouth. Protozoa are small organisms with many cells that can cause infections in the guts or in the lungs. Most healthy people do not get protozoal infections, but people with suppressed immune systems can. Viruses are not really organisms; they are tiny particles that can live only inside another cell. They reproduce by taking over a cell and causing that cell to make more virus particles, rather than doing what the cell is supposed to do. Viruses cause most colds and flu cases.

Dacryocystitis
Inflammation of the sac that collects tears for drainage from the eye.



SIMILAR TERMS
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Lacrimal gland
The tear gland located under the upper eyelid at the outer corner of the eye. The fluid it secretes cleans and provides moisture for the cornea. It is responsible for tearing during emotional stimulation or following corneal irritation by a foreign body or chemical.

Lacrimation
"Discharge of tears. ""Watering"" eyes."

Lacrisert
Lacrisert 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): hydroxypropyl cellulose.



PREVIOUS AND NEXT TERMS
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Lotrel
A medication used to treat hypertension, consisting of amlodipine and benazepril hydrochloride, and made by Novartis.

Lotensin
Used in the treatment of hypertension, this medication consists of benazepril hydrochloride and hydrochlorothiazide.

Ludiomil
A tetracyclic anti-depressant made by Novartis.

Levitra
Levitra, based in vardenafil, is Bayer's selective product for the treatment of erectile dysfunction.

Lacrimal gland
The tear gland located under the upper eyelid at the outer corner of the eye. The fluid it secretes cleans and provides moisture for the cornea. It is responsible for tearing during emotional stimulation or following corneal irritation by a foreign body or chemical.

Lacrimal sac

LASIK
LASIK (Laser in-Situ Keratomileusis) combines the precision of the excimer laser delivery system with the benefits of Lamellar Keratoplasty (LK) which has been proven to treat a wide range of refractive errors. Using the accuracy and precision of the excimer laser, LASIK changes the shape of the cornea to improve the way light is focused or "refracted" by the eye. First, a thin corneal flap is created, as an instrument called a microkeratome glides across the cornea. Then, in just seconds, ultraviolet light and high energy pulses from the excimer laser reshape the internal cornea with accuracy up to 0.25 microns. By adjusting the pattern of the laser beam, it is possible to treat high levels of nearsightedness and moderate amounts of farsightedness and astigmatism.

Lazy eye
A term often used instead of amblyopia. A loss of visual function, usually measured by visual acuity, in one or both eyes that cannot be explained by identifiable causes(s) such as a cataract or retinal disease. An eye that turns in (esotropia) or out (exotropia) may have a certain degree of central visual loss (amblyopia). A lazy eye is often treated by placing a patch over the stronger eye and forcing use of the lazy eye. The earlier the detection of the lazy eye the better for recovery of central vision with patching. If left untreated, after the age of about 8 or 9 years, patching therapy is no longer effective and the child will have a permanent loss of vision and loss of binocular vision and depth perception.

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.

Lens capsule
The lens capsule is a membrane that surrounds the lens of the eye. In cataract surgery, the lens is usually replaced with an intraocular lens but the lens capsule remains in the eye.

Levomepromazine
An antipsychotic drug.

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