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| dr william boothe - Phakic intraocular lenses |
| 05.21.08 (7:34 am) [edit] |
Dr. William BootheFDA is the abbreviation for the Food and Drug Administration. The FDA is the United States government agency responsible for the evaluation and approval of medical devices.( DR WILLIAM BOOTHE - EYE CENTER) DR. WILLIAM BOOTHE - LASIK DALLAS Dr William Boothe >> Phakic intraocular lenses, or Phakic intraocular lenses, are lenses made of plastic or silicone that are implanted into the eye permanently to reduce a person's need for glasses or contact lenses. Phakic refers to the fact that the lens is implanted into the eye without removing the eye's natural lens. During phakic lens implantation surgery, a small incision is made in the front of the eye. The phakic lens is inserted through the incision and placed just in front of or just behind the irisPhakic lenses are used to correct refractive errors, errors in the eye's focusing power. Currently all phakic lenses approved by the FDA are for the correction of nearsightedness (myopia).  Phakic intraocular lenses, or phakic lenses, are lenses made of plastic or silicone that are implanted into the eye permanently to reduce a person's need for glasses or contact lenses. Phakic refers to the fact that the lens is implanted into the eye without removing the eye's natural lens. During phakic lens implantation surgery, a small incision is made in the front of the eye. The phakic lens is inserted through the incision and placed just in front of or just behind the irisPhakic lenses are used to correct refractive errors, errors in the eye's focusing power. Currently all phakic lenses approved by the FDA are for the correction of nearsightedness (myopia). Dr William Boothe Optic Disc - The circular area where the optic nerve meets the retinal nerve fibers, and where blood vessels enter the eye. It’s also known as the “blind spot” because this intersection with the optic nerve and presence of blood vessels interferes with the retina’s function as a camera film.  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 - EYE CENTER 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).  Refractive surgery: A procedure, such as LASIK, that corrects vision and reduces or eliminates the need to wear glasses or contact lenses. DR WILLIAM BOOTHE - EYE SURGERY Intraocular Pressure the pressure of fluid inside the eye.  Flying Spot - A method of applying the excimer laser light used in refractive surgery. A flying spot laser is used, which has a 1mm - 2mm diameter light beam. The computer that controls the laser is programmed to send pulses to changing spots on the cornea, with no spots overlapping. Part of the ophthalmic laser system is an eye tracker, which responds to all eye movement during surgery. So even if the eye moves while it’s being treated, the entire targeted area will be treated, because the treatment plan has determined where the laser should shine, in the series of flying spots that will cover it entirely, and the whole system moves to correspond with any eye movements during surgery. DR WILLIAM BOOTHE - LASIK DALLAS Keratotomy - a surgical incision (cut) of the cornea  X-linked, for which the females are carriers and males develop the disease in alternating generations.( DR WILLIAM BOOTHE) Dr. William Boothe Double vision - Seeing objects in duplicate, with the second image being lighter and less distinct. Also known as ghosting.  Glare - scatter from bright light that decreases vision DR. WILLIAM BOOTHE Retina a thin layer of sensory tissue that lines the inside wall of the back part of the eyeball. The retina acts like the film in a camera to capture images created by the focusing power of the cornea and the lens and transform them into electrical signals that are sent to the brain through the optic nerve.  Kerato is the prefix indicating relationship to the cornea. DR. WILLIAM BOOTHE - LASIK SURGERY DR WILLIAM BOOTHE - LASIK SURGERY >> Conenital Glaucoma begins at or near the time of birth. Secondary Glaucoma is a result of some other illness. Each form of Glaucoma has its own causes and symptoms.  This can be disorientingCurrently manufactured excimer lasers use an eye tracking system that follows the patient's eye position up to 4,000 times per second, redirecting laser pulses for precise placement within the treatment zone. Typical pulses are around 1 mJ of pulse energy in 10 to 20 nanosecondsAfter the laser has reshaped the stromal layer, the LASIK flap is carefully repositioned over the treatment area by the surgeon, and checked for the presence of air bubbles, debris, and proper fit on the eye. The flap remains in position by natural adhesion until healing is completedPatients are usually given a course of antibiotic and anti-inflammatory eye drops. These are continued in the weeks following surgery. DR WILLIAM BOOTHE - LASIK SURGERY Peripheral Iridectomy surgical removal of part of the iris near its outer edge.  Pupil - The black circular opening in the middle of the iris controls the amount of light entering the eye. DR WILLIAM BOOTHE - DALLAS Iritis inflammation of the front portion of the eye that can lead to scarring inside the eye and glaucoma.  Halos are rings around lights due to optical imperfections in or in front of the eye.( DR. WILLIAM BOOTHE) DR. WILLIAM BOOTHE - EYE SURGERY The major difference between the two surgeries is the way that the stroma, the middle layer of the cornea, is exposed before it is vaporized with the laser. In PRK, the top layer of the cornea, called the epithelium, is scraped away to expose the stromal layer underneath. In LASIK, a flap is cut in the stromal layer and the flap is folded back.  Intraocular inside the eye. DR. WILLIAM BOOTHE - EYE CENTER Trifocals - (TRI-foh-kul) Corrective eyeglasses with three powers of correction: far distance, near distance, and intermediate distance. Typical reading glasses are bifocals which use most of their surface to correct for far distance, and have a small area at the bottom edge which corrects for near distance (reading). Trifocals also have a middle area which corrects for intermediate distance. Bifocals and trifocals are usually prescribed for people with presbyopia.  Wavelength - The distance between the top of one wave and the top of the next. Used of light waves. Specific wavelengths equate to specific colors. The excimer laser used in LASIK procedures is 193 nm in wavelength, which is an ultraviolet light (beyond the violet area, and therefore invisible to our eyes). DR WILLIAM BOOTHE - DALLAS LASIK Ophthalmoscope - (ahf-THAL-muh-skohp) A hand-held instrument with a light, used to examine the eye. It was first devised in 1915 by William Noah Allyn and Frederick Welch, who also founded the company Welch Allyn, which today manufactures many medical diagnostic and therapeutic devices. Astigmatism - a distortion of the image on the retina caused by irregularities in the cornea or lens DR 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 CustomVue- CustomVue is a safe and effective, FDA approved method for correcting nearsightedness, farsightedness and astigmatism. FDA clinical trials showed CustomVue offers the potential to enable better vision than contacts or glasses. DR. BOOTHE DR. WILLIAM BOOTHE - LASIK DALLAS >> Keratectomy is the surgical removal of corneal tissue. Dystrophy - Weakening or wasting of body tissue, such as happens in Epithelial Dystrophies and Stromal Dystrophies, where abnormalities appear in different corneal membranes, causing loss of function and often impairing vision.( DR. WILLIAM BOOTHE - EYE SURGERY) DR WILLIAM BOOTHE - LASIK Ciliary Body - Part of the eye which is in front of the lens, and behind the iris and cornea. It consists of (a) the ciliary muscle which controls the shape of the lens, making it flatter for far distant objects and more convex for closer things; and (b) the ciliary processes, tiny projects which secrete aqueous humor. DR. WILLIAM BOOTHE - DALLAS Custom Ablation - A unique form of the surgery known as "customized ablation," a new technique that allows doctors to precisely tailor the surgery to compensate for the most minute imperfections or aberrations within a person's eye. Keratitis - inflammation of the cornea DR. WILLIAM BOOTHE - DALLAS LASIK Wet (neovascular) – where new little blood vessels grow under the retina, leaking blood and fluid and causing further vision loss ABES - American Board of Eye Surgeons, a professional membership organization for ophthalmologists. It’s affiliated with the ACES, the American College of Eye Surgeons. DR. WILLIAM BOOTHE - LASIK ICL (Implantable Contact Lens) - The name used for the STAAR Myopic Visian ICL™, created by the STAAR Surgical Company and approved by the FDA in 2005 for treating myopia. It’s a refractive lens for use in a phakic eye (i.e., an eye that has its natural crystalline lens intact) and is implanted in the posterior chamber of the eye. In the United States, the Food and Drug Administration (FDA) regulates the sale of medical devices such as the lasers used for LASIK. Before a medical device can be legally sold in the U.S., the person or company that wants to sell the device must seek approval from the FDA. To gain approval, they must present evidence that the device is reasonably safe and effective for a particular use, the "indication." Once the FDA has approved a medical device, a doctor may decide to use that device for other indications if the doctor feels it is in the best interest of a patient. The use of an approved device for other than its FDA-approved indication is called "off-label use." The FDA does not regulate off-label use or the practice of medicineThe first refractive laser systems approved by FDA were excimer lasers for use in PRK to treat myopia and later to treat astigmatism. However, doctors began using these lasers for LASIK (not just PRK), and to treat other refractive errors (not just myopia). Over the last several years, LASIK has become the main surgery doctors use to treat myopia in the United States. More recently, some laser manufacturers have gained FDA approval for laser systems for LASIK to treat myopia, hyperopia and astigmatism and for PRK to treat hyperopia and astigmatism. DR WILLIAM BOOTHE Keratotomy is a surgical incision (cut) of the cornea. Intraocular inside the eye.( DR. WILLIAM BOOTHE) DR. WILLIAM BOOTHE - LASIK DALLAS Flap & Zap is a slang term for LASIK. Contact Lens, Therapeutic - Special contact lenses designed to help heal the eye and protect it while it heals. They’re often used along with eyedrops specially-prescribed to promote healing DR WILLIAM BOOTHE - LASIK DR. WILLIAM BOOTHE - LASIK SURGERY >> Keratectomy is the surgical removal of corneal tissue. Legal Blindness - A definition of blindness which enables a person to apply for government disability benefits. It can be either a visual acuity of 20/200 (or worse), with corrective lenses, in the better eye, or tunnel vision in the better eye of 20 degrees in diameter. This level of blindness is severe, but does not necessarily prevent a person from functioning at all. Dr William Boothe Ametropia - A generic name for eye conditions characterized by impaired refraction, e.g. myopia, hyperopia and astigmatism The goal is to achieve a more optically perfect eye, though the final result still depends on the physician's success at predicting changes which occur during healing. In older patients though, scattering from microscopic particles plays a major role and may exceed any benefit from wavefront correction. Hence, patients expecting so-called "super vision" from such procedures may be disappointed. However, while unproven, surgeons claim patients are generally more satisfied with this technique than with previous methods, particularly regarding lowered incidence of "halos", the visual artifact caused by spherical aberration induced in the eye by earlier methodsACULAR® DR BOOTHE Pachymetry - (puh-KIM-uh-tree) Testing of the cornea’s thickness, done to determine whether the cornea is strong enough for a LASIK procedure. It’s also done for some disorders where the cornea becomes thickened by excess water. The instrument used is a pachymeter. 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. 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