A type of laser that is used to remove thin sheets of tissue from the surface of the cornea, thus changing the curvature of the eye’s corneal surface. The procedure is used to excise diseased tissue or to correct myopia, when it is known as photorefractive keratectomy or lasik.
An inert substance added to a prescription in order to make the remedy as prescribed more suitable in bulk, consistence, or form for administration.
An ultraviolet laser used clinically to remove tissue from the cornea (e.g., in LASIK surgery) or to remove plaque from arteries. This rare gas (halide) energy source laser breaks chemical bonds instead of destroying tissue with heat; it penetrates less than 1 mm into tissue. Halide combines with an active medium (an excited dimer), from which it derives its name. The dimeric media are excited, emitting laser energy. The chemical composition of the medium determines the ultraviolet wavelength. The four most popularly used are: the argon fluoride (ArF) laser at 193 nm, the krypton fluoride (KrF) at 248 nm, the xenon chloride (XeCl) at 308 nm, and the xenon fluoride (XeFl) at 351 nm.
A specialized tool employed to vaporize tissue utilizes a focused beam of cold light with a single wavelength within the ultraviolet range. This instrument operates by emitting a coherent beam of light, which enables precise and controlled vaporization of targeted tissue.
An excimer laser is a device, guided by a computer, that is utilized to reshape the cornea, the clear, dome-shaped surface at the front of the eyeball. The laser carefully eliminates very thin layers of tissue from the surface of the cornea. This technique is employed to rectify vision disorders such as myopia (nearsightedness), hypermetropia (farsightedness), among others.