One of the most popular ways to correct vision is with a procedure called LASIK (laser in-situ keratomileusis), which uses a laser to change the curvature of the cornea (outer window of the eye). LASIK has quickly become the procedure of choice for most patients because they recover quickly and have fewer side effects and complications than with other methods of vision correction. In fact, most LASIK patients notice a significant improvement in their vision soon after surgery. LASIK removes tissue within the cornea to treat low to high levels of nearsightedness, farsightedness and astigmatism.
To treat nearsightedness, the steep cornea is made flatter by removing tissue from the center of the cornea. This moves the point of focus from in front of the retina to directly on the retina.
To treat farsightedness, the flat cornea is made steeper by removing tissue outside of the central optical zone of the cornea. This moves the point of focus from behind the retina to directly on the retina.
the cornea is made steeper
To treat astigmatism, the cornea is made more spherical -- like a basketball instead of a football. This eliminates multiple focusing points within the eye and creates one point of focus on the retina. Astigmatism can be treated at the same time as nearsightedness and farsightedness.
the cornea is made more spherical
LASIK is for those who:
- want to reduce or eliminate thir dependence on glasses or contacts
- are at least 18 years of age
- have had a stable eye prescription for at least one year
- have no health issues affecting their eyes
- have no signs of glaucoma or cataracts
What to expect on surgery day:
You will arrive at the Laser Eye Center about an hour prior to your procedure. Once you have been checked in you may be offered a sedative to help you relax. You will then be prepared for surgery. The area around your eyes will be cleaned and a sterile drape may be applied around your eye. Anesthetic eye drops will be used to numb your eyes; no injections or needles will be used. When your eye is completely numb, an eyelid holder will be placed between your eyelids to keep you from blinking during the procedure.
You will arrive at the Laser Eye Center about an hour prior to your procedure
The area around your eyes will be cleaned
and a sterile drape may be applied around your eye
Next, an instrument called a microkeratome will create a hinged flap of thin corneal tissue, and your doctor will gently fold the flap out of the way. During this process, you may feel a little pressure, but no pain. You will then be asked to look directly at a target light while the laser reshapes your cornea. The Excimer laser will be programmed with the information gathered in your pre-operative exam. The laser treatment will be completed in less than a minute or two, depending on the amount of correction needed. To finish the procedure, the protective layer will be folded back into place where it will bond without the need for stitches.
Following your procedure, your eye(s) will be examined with a slit lamp microscope. Then you will be given additional eye drops, and your eyes may be shielded for protection. Your vision will probably be a little blurry at first, so someone will need to drive you home. You should relax for the rest of the day. You may experience some discomfort for 12 to 24 hours, but this is usually alleviated with an over-the-counter pain reliever. Some people experience sensitivity to light, and watering or swelling of their eyes for a few days following their procedure.
Following your procedure, your
eye(s) will be examined with a slit lamp microscope
You will be asked to come back the next day for another examination of your eye(s). Most people can actually see well enough to drive the next day but it's best not to drive until you have been examined. You should be able to resume your normal activities the day after surgery.Vision can fluctuate for up to six months, but most people can see well enough to pass a driver's license vision exam following their procedure.