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Lazy eye
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.
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Acuity
The highest spatial frequency rsolvable with a grating of unity contrast (i.e. the maximum possibly contrast).
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.
Retinal
Light-absorbing portion of rhodopsin. The absorption of light causes retinal to change from 11-cis to 11-trans configuration
Disease
Illness or sickness often characterized by typical patient problems (symptoms) and physical findings (signs). Disruption sequence: The events that occur when a fetus that is developing normally is subjected to a destructive agent such as the rubella (German measles) virus.
Central
In anatomy and medicine (as elsewhere), central is the opposite of "peripheral" which means away from the center.
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.
Vision
The sense of sight.
Binocular
Using both eyes at the same time. Binocular vision is the most important element of depth perception.
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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
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.
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
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.
Legionnaire disease
An acute, sometimes fatal, pneumonia-like bacterial infection characterized by high fever, malaise, muscle aches, respiratory disorders and headache. It is named for an outbreak at the 1976 Philadelphia convention of the American Legion
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