LASIK

Doctors can help eyes see better.

They use a special light. This light changes the shape of the eye. This helps people see clearly.

First, a doctor looks at the eye. They check how thick the eye is. They make a tiny flap on the eye.

Then, the special light reshapes the eye. This part is very fast. It only takes a few minutes.

After that, the doctor puts the flap back. It works like a natural bandage. It does not need stitches.

Most people feel better very soon. They can do normal things in a day or two. It is a quick way to help.

LASIK is a way to help eyes see better. It is a type of surgery. A doctor called an ophthalmologist performs it.

The goal is to fix how light enters the eye. This helps people with blurry vision.

First, the doctor must study the eye. They use a tool called a topographer. This machine makes a map of the eye's surface. The doctor also checks how thick the cornea is. The cornea is the clear part on the front of the eye. This step makes sure the patient is ready for surgery.

Next, the surgeon makes a tiny flap on the cornea. They use a special tool or a laser. They fold the flap back to show the tissue underneath. Then, they use an excimer laser. This is a laser that can reshape the tissue very precisely. The laser removes tiny amounts of tissue to change the eye's shape.

Finally, the doctor puts the flap back in place. It acts like a natural bandage. It stays in place without any stitches. Most people can go back to normal life in a day or two.

The laser used in these surgeries is very special.

LASIK is a special kind of eye surgery used to fix vision. It helps people who have trouble seeing things clearly. Doctors use it to treat myopia, which is nearsightedness. It also helps with hypermetropia, or farsightedness, and astigmatism. An ophthalmologist is the doctor who performs this procedure.

This surgery changes the shape of the cornea. The cornea is the clear covering on the front of your eye. By changing its shape, light enters the eye in a better way.

Before the surgery starts, the doctor must do a lot of checking. They use a tool called a pachymeter to see how thick the cornea is. They also use a topographer to make a map of the eye's surface. This map shows the shape and any bumps on the eye. The surgeon uses this map to plan exactly where to remove tissue. The patient might also use special eye drops to prevent infection.

This careful planning ensures the surgery is safe for the patient.

During the actual procedure, the surgeon follows a few specific steps. First, they use a tool called a microkeratome or a femtosecond laser. This tool creates a very thin flap on the surface of the cornea. The surgeon carefully folds this flap back to show the tissue underneath. Then, an excimer laser is used to reshape the stroma. The stroma is the middle layer of the cornea. The laser removes tiny amounts of tissue to fix the vision.

Finally, the flap is put back in place to act as a natural bandage.

Scientists and doctors have worked on this for a long time. In the 1950s, a doctor named José Barraquer developed early techniques in Colombia. Later, in 1979, researchers at IBM discovered the excimer laser. They found it could etch tissue with great precision. In 1983, Steven Trokel suggested using this laser for eye surgery. Gholam A. Peyman also worked on this and received a patent in 1989.

These many steps helped make modern LASIK possible.

Many people around the world have used LASIK to see better. Between 1991 and 2016, more than 40 million procedures were done globally. In the United States, about 9.5 million people have had LASIK. The FDA says people 18 or older can have it. However, many doctors suggest waiting until age 21. This is because vision needs to stay stable for at least one year.

Most patients can return to their normal activities in just one or two days.

LASIK, which stands for laser-assisted in situ keratomileusis, is a type of refractive surgery. This procedure is used to correct vision problems like myopia, which is nearsightedness. It also treats hypermetropia, or farsightedness, and astigmatism. An ophthalmologist performs this surgery to change the shape of the cornea. The cornea is the clear layer at the very front of the eye. By reshaping this layer, the eye can focus light more accurately.

Before any surgery, a doctor must perform a detailed pre-operative screening. They need to ensure the patient is a suitable candidate for the procedure. A doctor uses a pachymeter to measure the thickness of the cornea. They also use a topographer to map the surface contour of the eye. This topographer uses low-power lasers to create a topographic map. This map helps the surgeon identify astigmatism or irregularities like keratoconus. The surgeon uses this data to calculate exactly how much tissue to remove. Patients may also take antibiotics or sedatives to prepare for the operation.

During the surgery, the doctor follows a precise mechanical process. First, they use a microkeratome, which is a blade device, or a femtosecond laser. This tool creates a thin flap in the cornea. The surgeon leaves a hinge at one end of this flap. Then, the flap is carefully folded back to reveal the corneal stroma. The stroma is the middle section of the cornea. Next, a computer-controlled excimer laser is used. This laser performs laser ablation, which means it vaporizes microscopic amounts of the stroma. Once the reshaping is finished, the flap is repositioned. The flap acts as a natural bandage and adheres without stitches.

There are different ways to perform this surgery. One variation is called wavefront-guided LASIK. In this version, the surgeon uses a wavefront sensor to guide the excimer laser. This helps correct more than just simple nearsightedness or astigmatism. It aims to address higher-order aberrations to create a more optically perfect eye. Another advancement is topography-assisted LASIK. This method is intended to increase precision and reduce side effects during night vision. The first topography-assisted device received FDA approval in September 2013.

The history of this technology involves many important discoveries. In the 1950s, José Barraquer developed early techniques in Bogotá, Colombia. He used a microkeratome to cut very thin flaps in the cornea. Later, in 1979, researchers at IBM discovered the capabilities of the excimer laser. They found that a 193 nm wavelength could etch organic tissue with extreme precision. In 1983, Steven Trokel suggested using this laser for eye surgery. He found the laser incisions were much smoother than older diamond knife methods. Gholam A. Peyman later applied for a patent for this procedure in 1985.

LASIK has been used by millions of people around the world. Between 1991 and 2016, more than 40 million procedures were performed globally. In the United States alone, roughly 9.5 million people have had LASIK. The FDA has approved the procedure for people aged 18 and older. However, the American Academy of Ophthalmology suggests waiting until age 21. This is because vision needs to be stable for at least one year. Most patients recover quickly and return to activities within one or two days.

After the surgery, patients must follow specific postoperative care instructions. They are usually prescribed antibiotic and anti-inflammatory eye drops for several weeks. To protect their eyes, patients might wear dark eyeglasses or protective goggles. They must also use preservative-free tears to keep their eyes moisturized. Sometimes, a doctor will place a bandage contact lens on the eye. This lens is typically removed after three to four days to aid healing. Proper care is essential to minimize the risk of complications after the procedure.