In this procedure, the eye surgeon makes a thin-hinged and accurate flap of cornea by making use of a microkeratome. Then the surgeon pulls the flap back, to see the underlying tissue of cornea. After this, the special laser reshapes the cornea in a predetermined way for every patient. After the reshaping, this flap is tenderly repositioned on the underlying cornea.

There is a focusing system in the human eye that comprises of the eye lens and the cornea (transparent front surface of the eye). The function of this focusing system is to focus the light rays on the retinal surface. This is pretty much like the working of a camera, where the lens of the camera focuses light on film. If your eyes are perfect and healthy, your lens and cornea would be perfectly adjusted to the eye length, and images would appear on focus. Any kind of maladjustment to this arrangement is known as refractive error, and this results in blurred vision.

Astigmatism: People who have astigmatism have distorted shape of lens or cornea, which causes many images to form on retina. Due to this condition, all objects seem blurry regardless of their distance from the eye. A number of people have a grouping of astigmatism with either hyperopia or myopia.

Myopia: It is commonly known as nearsightedness. If you were suffering from myopia, you would have maladjustment between eye length and the focusing power, and this causes faraway objects to seem blurred and near objects look clearer

All Lasik procedures use excimer laser, and in that sense,all Lasikprocedures are similar. Though they differ depending upon different manufacturers, including Nidek, Bausch & Lomb, Alcon, Wavelight, and Visx etc. These manufacturers have engineered explicit excimer lasers. Also, there are many types of laser extractions

Conventional Lasik is effective for almost all patients but can cause more visual problems, like halos, glare and even night vision problems. These problems are more frequent with conventional Lasik.