Posts Tagged ‘Excimer Laser’

How Laser Eye Surgery Works – Lasik and Photorefractive Eye Surgery

January 29th, 2010

People with eye-related problems are becoming more and more interested in laser eye surgery and its benefits because this is known to be the most exciting ophthalmologic procedure.

To be more precise, this is a refractive eye surgery that can correct all types of refractive errors such as: astigmatism (distorted vision), myopia (nearsightedness) and hyperopia (farsightedness).

Even if the medicine offers various types of surgical techniques for correcting refractive errors, the laser eye surgery was labelled by the American Academy of Ophthalmology the most technically advanced and precise one.

The excimer laser was the first laser ever approved for eye surgery and it’s used to correct myopia. Now, this laser is used in two different procedures: Laser in situ Keratomileusis (LASIK) and Photorefractive Keratectomy (PRK).

Photorefractive Keratectomy (PRK)

The surgeon maps and measures the patient’s eye before the procedure in order to analyse the problem. Then, he uses a few local anesthetic eye drops and reshapes the cornea eliminating tiny amounts of tissue from the outer surface.

Next, the doctor uses an ultra violet beam of light and cuts notches the size of human hair. Each pulse of light can remove a 39 millionth of an inch of cornel tissue in only 12 billionths of a second.

According to same studies, only 5% of the patients still use permanent glasses after the surgery while 15% need visual aids only when driving.

Laser in situ Keratomileusis (LASIK)

The LASIK procedure is more complicated than PRK but it’s a solution for solving all types of myopia.

The surgeon uses the Microkeratome to cut a corneal tissue flap in order to replace it. Everything depends on the doctor because with LASIK he has to make a very precise incision.

The patient only feels a little discomfort and sometimes an irritation but those won’t last too long. In most cases, the patients returned to their normal life in only two or three days.

With LASIK there can be only one side effect and that is occasional glare at night.

Anyway, everyone should know that even if the results are said to be permanent, the age can influence the final results and in some cases the doctor may even suggested re-surgery.




By: Ricky Lim

The History LASIK Surgery

January 27th, 2010

Almost everyone today has heard about Lasik eye surgery, but it wasn’t long ago that it was viewed as a brand new and revolutionary innovation. Lasik is actually an acronym that stands for laser assisted in-situ keratomileusis. It was development thanks to several advances in ophthalmologic technology, the first of which was the microkeratome blade invented in by Spanish ophthalmologist Jose Barraquer in the 1950s.

The microkeratome is an instrument containing an ultra-fine oscillating blade that is used to cut a thin flap in the eye’s cornea. In the decades that followed the invention of the microkeratome advances in laser technology would develop that enabled the eventual creation of the Lasik procedure.

The Excimer Laser

The first successful, working laser was tested in 1960. Researchers afterwards began developing more precise and powerful lasers. In the 1970s the Excimer laser was invented and it became one of the most crucial innovations in the field of ophthalmology.

The thing that made the Excimer laser unique was that, unlike previous lasers, it did not burn through tissue in order to make incisions. Rather it delivered enough energy to the targeted area that it actually caused the molecular bonds holding the tissue together to disintegrate into the air. Thus it was able to make ultra-precise cuts without burning tissue and risking possible thermal damage to surrounding areas. This meant that eye surgeries could now be conducted in a safer and more precise manner.

In the 1980s, Dr. Ioannis Pallikaris pioneered the concept of using the microkeratome invented by Barraquer in the 50s in conjunction with the Excimer laser. The microkeratome was used to cut the initial corneal flap. Once the cornea was accessed adn analyzed through corneal topography, the Excimer laser was used to do the actual re-shaping. Dr. Pallikaris himself conducted the first Lasik procedure in 1989.

LASIK Surgery Today

Since 1989 laser technology has only become more complex and precise. New procedures have made even the long-used microkeratome blade obsolete. In procedures such as epi-Lasik and IntraLase, a laser blade is used instead of the metal one to cut the flap in the cornea. This results in more accurate incisions that cause less discomfort and pain.




By: Ryan Frank

How Lasers are Revolutionizing Surgical Procedures

November 14th, 2009

The laser existed in theory long before it existed in reality. Albert Einstein was exploring the concept as early as 1917 when he was writing his seminal study on The Quantum Theory of Radiation. But even after the first working laser was successfully tested in 1960, people were skeptical about whether light could be used as a physical medical instrument. Less than five decades later, however, the laser has become one of the most versatile tools in the various fields of medical surgery.

Lasers have a variety of unique physical properties, which can be finely adjusted and changed in order to accomplish different surgical tasks. The light color and intensity of a laser and the way in which it interacts with the targeted tissue can be controlled, so that it becomes one the most delicate and precise instruments that a surgeon can have at his or her disposal.

The most well known surgical field in which lasers have made a huge impact is in the field of ophthalmology, or eye surgery. The excimer laser, which was invented in 1970 by Nikolai Basov, was especially useful. Rather than burn through tissue, the excimer laser conducts enough energy towards a targeted area so that it breaks down the bonds that hold tissue together. This allows ophthalmologists to target precise and often extremely thin layers of tissue without running the risk of damaging surrounding tissue.

But lasers have been used in other kinds of surgery as well. Laser scalpels, for example, have become one of the most precise and useful tools when there’s the need for making exact, delicate incisions during surgery. Laser scalpels are usually composed using carbon dioxide lasers. They are highly focused and accurate, enabling doctors to make cuts at the exact same, constant depth, whereas conventional metal scalpels run the risk of cutting too deeply. Also, lasers cauterize blood vessels even as they cut through tissue, thus preventing excessive blood loss.

Lasers have helped by eliminating the need for certain kinds of surgeries. For example, the open chest surgery that used to be required for de-clotting a patient’s arteries is no longer the only option available. The miniaturization of laser technology has made it possible to access a patient’s arteries by inserting a tiny optical fiber array containing a small laser through a patient’s vein, on the arm or leg. Using the optic fiber as a guide, doctors can travel through a patient’s veins to the arteries and fire the laser to destroy the harmful plaque.

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By: Ryan Frank