How does LASIK work?

Posted on 20. Sep, 2013 by in surgery

What is LASIK?

LASIK is an abbreviation for laser in situ keratomileusis, which means using a laser underneath a corneal flap (in situ) to redesign the cornea (keratomileusis). This is a procedure that uses a very high end laser technology intended to amend eye refractive errors, recover one’s vision, and decrease or remove the need for wearing glasses or contact lenses. This laser procedure corrects the shape of the cornea, which is the transparent front covering of the eye.

When does one need LASIK surgery?

In the eye of humans, the front surface (cornea) and lens that it includes form the eye’s “focusing system” and is responsible primarily for focusing the received light rays onto the surface of the retina, similarly to the lenses of a camera focus light onto the film. In a perfect optical system, the power of the cornea and lens are perfectly matched with the length of the eye and images are in focus; any mismatch in this system is called a refractive error, and the result is a blurred image at some location.

What are the basic types of refractive error?

There are three types of refractive errors: myopia, hyperopia and astigmatism.

Myopia (nearsightedness): What happens inside the eyes of people with myopia is that there becomes a mismatch in the focusing power and eye length which causes for far away objects to be blurred and for near objects to remain much clearer.

Hyperopia (farsightedness): In the eyes of people suffering from hyperopia however, the mismatch that happens in the focusing power and the eye length causes for an opposite effect, this time near objects appear dim and the distant ones appear to be more clear.

Astigmatism: In the eyes of people with astigmatism, what happens is one of two things; it is either the corneal or lens shape that becomes distorted, causing as an effect multiple images to appear on the retina. With this condition in force, all objects at all distances appear blurry. Many people have a combination of either myopia or hyperopia with astigmatism.

How does LASIK work?

During a typical LASIK procedure, a highly trained eye surgeon first performs a accurate, thin hinged corneal flap with the use of a microkeratome. Then he takes back the flap to uncover the corneal tissue that is beneath, after that, the excimer laser reshapes the cornea in a single pre-specified shape every single patient, making it a unique design every one time. At the very end of the procedure, the flap is being softly relocated onto the underlying cornea .What are the benefits of LASIK surgery?

LASIK has many benefits, people who have used it claim. First it is proven that it corrects vision. Internet sources claim that around 90% of patients who have tried LASIK before are satisfied with the results. Also, LASIK is thought to inflict low levels of pain, if at all. It doesn’t take time – vision is corrected nearly immediately or during the next day after LASIK. There are no stitches or bandages required after LASIK surgery. Adjustments can be made years after LASIK to further correct vision. After having LASIK surgery, most people experience a huge reduction in eyeglass or contact lens dependence and many of them don’t need them at all. Eye Lasik in Austin has had some really positive testimonials regarding this kind of surgery. Patients claim that their vision has improved immediately after the surgery.

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