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Automated Lamellar Keratoplasty: A refractive surgery procedure used to treat relatively high degrees of myopia and some cases of hyperopia. This procedure uses only the microkeratome and is not as accurate as the laser procedures that are currently available.
Blind Spot: A small area of the retina where the optic nerve enters the eye which occurs normally in eyes, or a gap in the visual field corresponding to an area of the retina where no visual cells are present.
Cataract: A gradual opacity or clouding of the normally clear crystalline lens of the eye, caused by the natural aging process, metabolic changes, injury, various forms of radiation, toxic chemicals and certain drugs.
Diopter: A unit of measurement used to describe the degree of refractive error with respect to nearsightedness, farsightedness and astigmatism.
Flashes and Floaters: A condition that occurs when the back of the eye, filled when a jelly-like substance (vitreous gel), becomes increasingly more liquid-like in nature, causing small particles, called floaters, to become visually evident. Flashes originate from the tugging on the retina as the vitreous gel liquefies.
Fluorescein Angiography: A test to examine blood vessels in the retina, choroid and iris in which a special dye is injected into a vein in the arm and photographic images are created as the dye passes through blood vessels in the eye.
Low Vision: Visual loss, which cannot be corrected with conventional glasses or contact lenses. May interfere with daily living activities and can be treated by a low vision specialist or center, e.g. Center for Visually Impaired.
Myopia (Nearsightedness): A condition that results from the visual image being focused in front of the retina. It occurs if the cornea is relatively too steep and/or the eye is too long, and results in blurred vision for distant sight.
Optometrist: A professionally licensed eye specialist who prescribes eyewear, contact lenses, low vision aids, and vision therapy for adults and children. An optometrist may also treat non-surgical eye diseases, such as infections, allergic conditions and glaucoma.
Radial Keratotomy (RK): A surgical procedure to correct mild to moderate cases of nearsightedness and astigmatism. Involves placement of patterned, radial incisions in the peripheral cornea to change corneal shape.
Thermokeratoplasty (CK): refractive procedure that uses a laser to heat and shrink tissues in the peripheral cornea. Intended to alter corneal shape and correct cases of farsightedness and/or astigmatism.
Visual Acuity: The ability to distinguish details and shapes of objects.Visual Field: The entire area that can be seen with the eye, including peripheral vision.Vitreous: The transparent, colorless mass of gel that lies behind the lens and in front of the retina. Occupies four fifths of the volume of the eye.Wavefront: A three dimensional system that evaluates the path of light within the eye. Tracks and records visual abnormalities beyond simple nearsightedness, farsightedness, and astigmatism.
Wavescan Systems: A component of the LASIK procedure that uses wavefront technology to record an individualized and precise analysis of the eye. The information is integral in creating a custom and personalized approach to LASIK laser vision correction.