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Gland: 1. A group of cells that secrete a substance for use in the body. For example, the thyroid gland. 2. A group of cells that removes materials from the circulation. For example, a lymph gland.
Bacteria: Single-celled microorganisms which can exist either as independent (free-living) organisms or as parasites (dependent upon another organism for life).( - boothe eye care laser surgery)

dr william boothe laser center: Rosacea Skin condition typically involving the face that is characterized by flushing, red bumps and telangiectasia (dilated, visible capillaries); it is most common among fair-skinned women, who develop it in their 30s through 50s.

Toxocariasis Infection caused by Toxocara worms, which are typically found in cat and dog intestines. The form found in the eyes, ocular larva migrans, can cause vision loss.

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Skin: The skin is the body's outer covering. It protects us against heat and light, injury, and infection. It regulates body temperature and stores water, fat, and vitamin D. Weighing about 6 pounds, the skin is the body's largest organ. It is made up of two main layers; the outer epidermis and the inner dermis. ( dr boothe laser center )

Retina The sensory membrane that lines the back of the eye. Cells in the retina called photoreceptors transform light energy into electrical signals that are transmitted to the brain by way of the optic nerve.

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Spots Small, cloudy specks in the eye that become noticeable when they fall in the line of sight. Read our spots and floaters article.( Dr. Boothe TX )
Boothe Eye Care & Laser Surgery: Phytochemicals Chemicals found in plants that help protect against disease.
Dr. Boothe Laser Center: Excimer laser An instrument that uses shorter wave (ultraviolet) light to vaporize and remove tissue from the eye's surface during vision correction procedures.

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Trachoma Chronic infection of the eyelid and cornea caused by a micro-organism that is spread by contact with eye discharge from an infected sufferer. Flies can also transmit the bacteria. Over time, the eyelid becomes scarred and turns inward. The eyelashes begin to scrape the eyeball and cornea, which eventually causes visual impairment and blindness. Worldwide, 84 million people are affected by trachoma. Clean water and good hygiene can prevent trachoma, while antibiotics can treat it early on. Inward-turning eyelids can be corrected with simple surgery performed by a nurse. (Information supplied by ORBIS International.)
Lacrimal: Pertaining to tears, as in lacrimal gland (tear gland). From the Indo-European dakru meaning a tear (from a weeping eye) which gave rise to the Greek dakry and the Latin lacrima.( - Dr Boothe Eye Surgery)

Dr Boothe Eye Care: Macula Part of the eye near the middle of the retina; the macula allows us to see objects with great detail.

Vitamin A: Vitamin A is retinol. Carotene compounds (found, for example, in egg yolk, butter and cream) are gradually converted by the body to vitamin A (retinol). A form of vitamin A called retinal is responsible for transmitting light sensation in the retina of the eye

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Corneal opacity A cloudy spot in the cornea, which is normally transparent. Causes include corneal scar tissue and infection. Symptoms include halos around lights, photophobia, vision loss and a white or cloudy spot on the eye. ( Dr Boothe Lasik )

Metamorphopsia Vision problem in which objects appear distorted. For example, straight lines may appear to be wavy, curved or bent, objects may appear to be larger or smaller than they actually are, or closer or farther away than they actually are. Metamorphopsia is typically caused by conditions or diseases that affect the eye's macula and retina.

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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.( Boothe Eye Care & Laser Surgery )
Dr. William Boothe Texas: Diplopia Also called double vision. When two images of the same object are perceived by one or both eyes. Read our article on double vision and also review eye symptoms for a list of conditions that can cause double vision.
Dr. Boothe Eye Care: Keratoplasty Any of several types of corneal surgery, such as shrinking the collagen to reduce farsightedness or transplanting a new cornea to treat keratoconus.

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Scaling: Abnormal shedding or accumulation of an upper layer of skin (the stratum corneum ).
Central island Refractive surgery complication in which the laser leaves an "island" of corneal tissue in the concave ablation zone. Symptoms include double vision and distortion. Read more about potential complications of LASIK and other kinds of refractive surgery.( - dr william boothe dallas)

dr william boothe dallas: Myelin A sheath made of proteins that covers nerve fibers. Myelin is essential to transmission of nerve impulses carrying information to and from various parts of the body. When myelin is destroyed or damaged in the optic nerve, the result is optic neuritis, with vision loss or distortions.

Pain: An unpleasant sensation that can range from mild, localized discomfort to agony. Pain has both physical and emotional components. The physical part of pain results from nerve stimulation. Pain may be contained to a discrete area, as in an injury, or it can be more diffuse, as in disorders like fibromyalgia . Pain is mediated by specific nerve fibers that carry the pain impulses to the brain where their conscious appreciation may be modified by many factors.

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Higher-order aberration Irregularity of the eye other than a refractive error (myopia, hyperopia or astigmatism). Higher-order aberrations sometimes affect your vision (such as decreasing contrast sensitivity), and sometimes do not. For more information, please see our higher-order aberration article. ( dr boothe tx )

Fixation In terms of vision, the eye's ability to maintain gaze upon an object.

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Wear schedule How long you wear your contact lenses: either daily wear (you remove the lenses each night) or extended wear (you may sleep with them in). It's important to differentiate between wear schedule and replacement schedule — that is, how often you discard and replace your lenses.( Dr. Boothe Dallas )
Dr. William Boothe Lasik: Rod A photosensitive receptor in the retina that helps you to see in low light.
Dr. Boothe Eye Surgery: Keratitis Inflammation of the cornea, caused by an infection or inflammatory process. Symptoms include eye pain or discomfort, light sensitivity, foreign body sensation, grittiness and tearing.

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Bifocal Lens with one segment for near vision and one segment for far vision. The term can apply to both eyeglass lenses and contact lenses.
Color blindness Partial or total inability to distinguish specific colors. Color blindness is inherited, and is much more common in men than in women.( - Dr. Boothe)

Boothe Eye Care & Laser Surgery: Descemet's membrane Corneal layer between the stroma and the endothelium.

Placebo A "false" but harmless treatment that has no proven medical value. Placebos usually are incorporated into clinical trials to measure how patients respond to an authentic therapy that is being tested. Some patients are given placebos, and others are given the actual therapy, to provide objective comparisons and assessments.

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Melanosis Condition characterized by melanin (pigment) deposits in the skin or eyes. ( Dr. William Boothe Eye Surgery )

Botulism Serious illness from a toxin produced by Clostridium bacteria (usually Clostridium botulinum). Infant botulism and food-borne botulism are the most common forms in the United States. Symptoms include double vision, blurred vision, ptosis, muscle weakness, difficulty speaking, difficulty swallowing, difficulty breathing and nausea.

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Atropine: A drug obtained from belladonna that is administered via injection, eye drops, or in oral form to relax muscles by inhibiting nerve responses. Used to dilate the pupils and as an antispasmodic .( Dr. William Boothe TX )
Dr. Boothe TX: ANSI The American National Standards Institute is a private, non-profit organization that coordinates efforts to develop standards for manufacturing many different products, including eyeglass lenses. For example, certain ANSI standards define acceptable levels of impact resistance for safety eyewear.
Dr. Boothe: Optic nerve head Also called optic disk. Circular area where the optic nerve enters the retina, and the location of the eye's blind spot.

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Phoropter Device that provides various combinations of lenses used for tests of vision errors in eye examinations.
OD Abbreviation for "oculus dexter," the Latin term for "right eye." Or, doctor of optometry.( - Dr. Boothe Eye Care)

Dr. William Boothe TX: Bulbar conjunctiva: That part of the conjunctiva, a clear membrane of the eye, which covers the outer surface of the eye.

Astigmatism Condition in which the cornea's curvature is asymmetrical (the eye is shaped like a football or egg instead of a baseball); light rays are focused at two points on the retina rather than one, resulting in blurred vision. Additional symptoms include distorted vision, eyestrain, shadows on letters, squinting and double vision. Read more about astigmatism.

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Pterygium Triangular fold of tissue on the white of the eye that can eventually grow over part of the cornea; the cause may be irritation from sun (i.e., UV rays), dust and wind. Some people have no symptoms, while others may have redness or blurred vision. Pterygia that are chronically inflamed can become itchy. Read more about pterygium and pinguecula. ( Dr. William Boothe Laser Center )

Retinitis Inflammation of the retina. Symptoms include blurred vision, metamorphopsia, floaters and vision loss.

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Dry eye: A deficiency of tears. The main symptom is usually a scratchy or sandy feeling as if something is in the eye. Other symptoms may include stinging or burning of the eye; episodes of excess tearing that follow periods of very dry sensation; a stringy discharge from the eye; and pain and redness of the eye. Sometimes people with dry eye experience heaviness of the eyelids or blurred, changing, or decreased vision, although loss of vision is uncommon.( Dr. William Boothe Eye Care )
Dr. William Boothe Lasik: Aura A sensation experienced before an attack of epileptic seizure, migraine or other disorder. Examples are flashes of light, colored lights, numbness, coldness and even hearing voices.
Boothe Eye Care & Laser Surgery: Porphyria Disorder in which the body produces too much of a compound called porphyrin and releases it in the urine, causing a reddish color. Other symptoms include light sensitivity, skin that swells or is sensitive to sunlight, abdominal pain, blisters and muscle weakness.