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LASIK eye surgery is a commonly performed laser refractive surgery to correct vision problems. This 3D animation shows how laser-assisted in situ keratomileusis (lasik) can be an alternative to glasses or contact lenses.

For you to see clearly, light rays must travel through your cornea and lens. The cornea and lens refract the light so it lands on the retina. The retina turns light into signals that travel to your brain and become images. With refractive errors, the shape of your cornea or lens keeps light from bending properly. When light is not focused on the retina as it should be, your vision is blurry.

In eyes with normal vision, the cornea bends (refracts) light precisely onto the retina at the back of the eye. But with nearsightedness (myopia), farsightedness (hyperopia) or astigmatism, the light is bent incorrectly, resulting in blurred vision.

During LASIK eye surgery, a special type of cutting laser is used to precisely change the shape of the dome-shaped clear tissue at the front of your eyes (cornea) to improve vision.

Glasses or contact lenses can correct vision, but reshaping the cornea itself also will provide the necessary refraction.

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