Dr. William Boothe
Diabetes Type 1 - Insulin-dependent diabetes, also known as juvenile diabetes because it’s often diagnosed in young people. The pancreas, which normally would produce insulin, is unable to do so, so insulin must be injected so the patient can convert sugars and starch into energy. A person with Diabetes, Type 1 or 2, is susceptible to vision problems because the tiny blood vessels in the eyes weaken and start to leak, damaging the retina. See Diabetic Retinopathy( Dr. William Boothe)
DR. WILLIAM BOOTHE
Dr William Boothe >> The cornea and natural lens of the eye focus light to create an image on the retina, much like the way the lens of a camera focuses light to create an image on film. The bending and focusing of light is also known as refraction. Imperfections in the focusing power of the eye, called refractive errors, cause images on the retina to be out of focus or blurredPeople that are nearsighted have more difficulty seeing distant objects than near objects. For these people, the images of distant objects come to focus in front of the retina instead of on the retinaIdeally, phakic lenses cause light entering the eye to be focused on the retina providing clear distance vision without the aid of glasses or contact lensesSurgery is not required to correct nearsightedness. You can wear glasses or contact lenses instead to correct your vision. Depending on how nearsighted you are, and other conditions of your eye, other refractive surgery (surgery to correct refractive errors) options may be available to you, including PRK (Photorefractive Keratectomy) and LASIK (Laser Assisted In-Situ Keratomileusis)Phakic lenses are intended to be permanent. While the lenses can be surgically removed, return to your previous level of vision or condition of your eye cannot be guaranteedPhakic intraocular lenses are implanted in the eye without removing the natural lens. This is in contrast to intraocular lenses that are implanted into eyes after the eye's cloudy natural lens (cataract) has been removed during cataract surgeryAccommodation the ability of the eye to increase its focusing power. As an object is viewed closer up, greater focusing power is needed to continue to see it clearly.
Transition Zone - In a laser procedure, the area between the optical ablation zone and the untreated area of the cornea. The laser removes tissue more deeply in the center of the ablation zone, and gradually tapers off through the transition zone, to the original corneal tissue outside the ablation zone.
DR. WILLIAM BOOTHE - LASIK SURGERY
Pentacam - German-developed diagnostic tool for laser vision correction surgery.
DR WILLIAM BOOTHE - LASIK
Laser is an acronym for light amplification by stimulated emission of radiation. A laser is an instrument that produces a powerful beam of light and can vaporize tissue.
Custom LASIK - A custom LASIK system is designed to fit a patient's unique visual needs through the use of the CustomVue system by VISX.
DR WILLIAM BOOTHE - LASIK DALLAS
Double Vision seeing two images of a single object instead of one.
Various measures are usually taken to prevent it, such as use of sterile tape to keep the eyelashes away from the treatment area, rinsing the cornea before making the flap, and rinsing again before replacing the flap. After surgery, medicated eyedrops are typically used to prevent inflammation. DLK needs to be detected promptly so that it won’t impair vision. Usually it responds well to use of corticosteroid eyedrops and sometimes the surgeon will lift the flap again to rinse beneath it.
DR WILLIAM BOOTHE - LASIK SURGERY
Double vision - Seeing objects in duplicate, with the second image being lighter and less distinct. Also known as ghosting.
Allegretto - A manufacturer of medical equipment( DR. WILLIAM BOOTHE - LASIK)
DR WILLIAM BOOTHE - DALLAS LASIK
Algorithm - A mathematical formula such as is used when preparing for a LASIK, PRK, LASEK or Epi-LASIK surgery, to set the laser’s ablation area on that particular individual’s eyes
CustomVue - The trade name for a wavefront-guided LASIK that uses the VISX S4 Excimer laser
DR WILLIAM BOOTHE - EYE SURGERY
Central Island - An area of the laser-treated part of the cornea which is erroneously not treated, so that its level remains microscopically higher than the surrounding treated surface. The term island describes its appearance. It causes diplopia (double vision).
Presbyopia - the inability to maintain a clear image (focus) as objects are moved closer. Presbyopia is due to reduced elasticity of the lens with increasing age.
DR. WILLIAM BOOTHE - EYE CENTER
DR WILLIAM BOOTHE - LASIK SURGERY >> Variable Spot - A method of applying the excimer laser energy during refractive surgery. The computer that controls the laser is programmed to have it focus on spots of varying sizes across the ablation area, rather than equal-sized flying spots, or in a broadbeam fashion.
DR WILLIAM BOOTHE
Pupil is what appears as a small black dot in the center of the iris and changes its diameter in response to ambient lighting.
Corneal Abrasion - A scrape or scratch on the cornea, the front surface of the eye
DR. WILLIAM BOOTHE - EYE SURGERY
Myopia - the inability to see distant objects as clearly as near objects
Excimer laser - an ultraviolet laser used in refractive surgery to remove corneal tissue( DR WILLIAM BOOTHE - EYE SURGERY)
DR WILLIAM BOOTHE - EYE CENTER
Microkeratome - a mechanical surgical device that is affixed to the eye by use of a vacuum ring. When secured, a very sharp blade cuts a layer of the cornea at a predetermined depth
Overcorrection is a complication of refractive surgery where the expected amount of correction is more than desired and often occurs where healing regresses less vigorously than predicted.
DR. WILLIAM BOOTHE - LASIK
Sclera - The outer layer of the eye. (provides protection)
Visual Acuity is simply the clearness of vision or the ability to distinguish details and shapes or objects.
DR. WILLIAM BOOTHE - LASIK DALLAS
Dry Eye is a common condition that occurs when the eyes do not produce enough tears to keep the eye wet and comfortable. Common symptoms of dry eye include feelings of stinging, burning, or scratchiness of the eyes.
Sands of Sahara - See Diffuse Lamellar Keratitis
Dr William Boothe
Convex Lens - Lenses with the opposite curvature to concave lenses. They bulge outwards like a ball and are used to correct hyperopia and presbyopia
Photoablation - The tissue removal done by an excimer laser in refractive surgery. This type of laser a has cool ultraviolet wavelength which is extremely strong. It breaks down the molecular bonds of the corneal tissue targeted, and also evaporates the remaining corneal fragments from the eye’s surface. The term “photoablation” means “light removal”.
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DR. WILLIAM BOOTHE - LASIK DALLAS >> Granular Dystrophy - A hereditary eye condition where pale gray granules appear in the stromal layer of the cornea, like little crumbs. It’s usually detected by the time a person is about 20. By age 40 or so, vision will be increasingly impaired as those granules, or lesions, expand, increase in number, coalesce, and penetrate more deeply into the stroma. It can be treated in earlier stages with an excimer laser, or in other ways that remove the granules, and later on by a corneal transplant.
Cataract cloudiness of the natural lens inside the eye that can blur vision.( DR. WILLIAM BOOTHE - EYE CENTER)
Dr. William Boothe
Retina: Nerve tissue that forms a membrane lining inside the eye. Light passes through the lens, which creates an image and transmits it to the retina. The retina, in turn, converts this optical information into electrical pulses that travel across the optic nerve to the brain.
DR. WILLIAM BOOTHE - DALLAS
Myopia - the inability to see distant objects as clearly as near objects
LASIK is a surgical procedure intended to reduce a person's dependency on glasses or contact lenses. The goal of this Web site is to provide objective information to the public about LASIK surgery. See other sections of this site to learn about what you should know before surgery, what will happen during the surgery, and what you should expect after surgery. There is a glossary of terms and a checklist of issues for you to consider, practices to follow, and questions to ask your doctor before undergoing LASIK surgeryLASIK stands for Laser-Assisted In Situ Keratomileusis and is a procedure that permanently changes the shape of the cornea, the clear covering of the front of the eye, using an excimer laser. A mechanical microkeratome (a blade device) or a laser keratome (a laser device) is used to cut a flap in the cornea. A hinge is left at one end of this flap. The flap is folded back revealing the stroma, the middlesection of the cornea. Pulses from a computer-controlled laser vaporize a portion of the stroma and the flap is replaced. There are other techniques and many new terms related to LASIK that you may hear aboutThe cornea is a part of the eye that helps focus light to create an image on the retina. It works in much the same way that the lens of a camera focuses light to create an image on film. The bending and focusing of light is also known as refraction. Usually the shape of the cornea and the eye are not perfect and the image on the retina is out-of-focus (blurred) or distorted. These imperfections in the focusing power of the eye are called refractive errors.
DR WILLIAM BOOTHE - DALLAS
Vitreous Humor - the transparent, colorless mass of gel that lies behind the lens and in front of the retina and fills the center of the eyeball
Aphakic Spectacles - Very thick and heavy glasses that in past years were the standard remedy after a cataract operation. They gave distorted peripheral vision. Modern ophthalmologists can instead implant an intraocular lens (IOL)
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Refractive Errors - imperfections in the focusing power of the eye, for example, hyperopia, myopia, and astigmatism
There is also Pseudoesotropia, which looks like esotropia but is a temporary condition where a young child’s eyes haven’t yet grown the white part next to the nose. The bridge of the nose appears wide and the eyes appear to be both turned inward. This resolves itself as the child’s face develops.
DR. WILLIAM BOOTHE - DALLAS LASIK
Age-Related Macular Degeneration (ARMD) - Deterioration, as people age, of the macula lutea (also called the yellow spot), which is a small area on the retina which gives maximum vision. If left untreated, it results in blindness
Dilation - Dilation is the process of widening the pupil. This is done naturally to allow you to see in lower light, and with eye drops so that the eye doctor can examine the back of the eye.( DR WILLIAM BOOTHE - LASIK)
DR. BOOTHE
In extreme cases, where ideal technique was not followed and before key advances, some people could suffer rather debilitating symptoms including serious loss of contrast sensitivity in poor lighting situationsOver time, most of the attention has been focused on spherical aberration. LASIK and PRK tend to induce spherical aberration, because of the tendency of the laser to undercorrect as it moves outward from the center of the treatment zone. This is really a significant issue for only large corrections.
Dry (non-neovascular) – where new blood vessels do not grow, so that this is a less severe form of the disease; however, it sometimes progresses into the Wet form
Dr. William Boothe
DR WILLIAM BOOTHE - EYE CENTER >> Refractive Power - the ability of an object, such as the eye, to bend light as light passes through it
ALK Abbreviation for Automated Lamellar KeratectomyAllergan
DR WILLIAM BOOTHE - DALLAS
Farsightedness is the common term for hyperopia.
Endothelial Dystrophy - See Fuch’s Dystrophy.
DR. WILLIAM BOOTHE - EYE SURGERY
Presbyopia: An age-related condition in which the natural lens loses elasticity, which impairs the eye’s ability to focus on near objects. Presbyopia resembles hyperopia, but is a different condition.
Keratectomy - the surgical removal of corneal tissue
DR WILLIAM BOOTHE - LASIK DALLAS
Cornea - (KOR-nee-uh) The front clear part of the eye in front of the pupil and iris. It acts as a lens, refracting light rays as they enter the eye. The eye’s crystalline lens refracts them further to focus them on the retina at the back of the eye. The cornea also allows light to pass out through it, making the iris visible, the eye’s color
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