LASIK
LASIK
LASIK (pronounced /ˈlæsɪk/), an acronym for Laser-Assisted in Situ Keratomileusis, is a type of refractive eye surgery. It is used to correct myopia, hyperopia, and astigmatism.
Etymology
The term "LASIK" is derived from the Greek words "kerato" meaning cornea, "mileusis" meaning to shape, and "in situ" meaning in its original place. The "Laser-Assisted" part of the term refers to the use of a laser to reshape the cornea.
Procedure
During a LASIK procedure, a thin flap in the cornea is created using either a microkeratome blade or a femtosecond laser. The surgeon folds back the flap, then removes some corneal tissue underneath using an excimer laser. The flap is then laid back in place, covering the area where the corneal tissue was removed.
Related Terms
- Myopia: Also known as nearsightedness, a condition where close objects appear clearly, but distant objects appear blurry.
- Hyperopia: Also known as farsightedness, a condition where distant objects may be seen more clearly than objects that are near.
- Astigmatism: A common vision condition that causes blurred vision due to the irregular shape of the cornea or the lens inside the eye.
- Microkeratome: A precision surgical instrument with an oscillating blade designed for creating the corneal flap in LASIK or ALK surgery.
- Femtosecond laser: A laser that emits optical pulses with a duration well below 1 picosecond (one trillionth of a second).
- Excimer laser: A form of ultraviolet laser which is commonly used in eye surgery and semiconductor manufacturing.
External links
- Medical encyclopedia article on LASIK
- Wikipedia's article - LASIK
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