How Laser treatment removes defective eye power?

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Answers:
Eye surgery in which the surface of the cornea is reshaped using a laser, performed to correct certain refractive disorders, such as myopia
The surgeon uses an excimer laser to cut or reshape the cornea so that light will focus properly on the retina
In LASIK surgery,

(A). the eye is held open with a speculum, and a suction ring is attached to the eyeball
(B), A microkeratome is used to shave the protective flap off the top of the eye
(C). which is then pulled back
(D), A computer-controlled laser is used to reshape the cornea (E). and the protective flap is replaced
LASIK is an elective surgery for patients who want to permanently correct myopia (nearsightedness), hyperopia (farsightedness), or astigmatism without eyeglasses, contact lenses, or refractive surgical procedures. The goal for most patients is to be free of any type of corrective lenses. Some patients may find wearing eyeglasses or contact lenses interferes with their careers or hobbies. Many professional athletes have chosen LASIK to improve their performance. However, patients with higher degrees of refractive error will still need some type of corrective lens.

LASIK is most commonly performed on myopes. For myopia, the surgeon flattens the cornea; for hyperopia, the surgeon steepens the cornea. Surgeons correct astigmatism by creating a normally shaped cornea with the excimer laser.

A new type of LASIK also can treat contrast sensitivity as well as refractive error. Custom LASIK incorporates new eye mapping technology into standard LASIK. The surgeon measures the eye from front to back creating a three dimensional corneal map. This much-more detailed map gives surgeons more specific information for the excimer laser and enables them to correct other abnormalities besides refractive error.

How Laser treatment removes defective eye power?

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