Technology Has Expanded the Number of Conditions Treated with LASIK
Laser-assisted in-situ keratomileusis (LASIK) can treat a wide array of eye irregularities that cause poor vision. Traditional LASIK corrects what is known as lower-order aberrations, which include nearsightedness, farsightedness, and astigmatism. Advances in technology have increased the number of conditions treated with LASIK at our Toronto, ON, eye center. With our cutting-edge technology, we can also treat the higher-order aberrations that result from tiny imperfections in the cornea. If you are interested in becoming one of the thousands of patients who have gained clear vision with LASIK and reduced or eliminated their dependence on corrective eyewear, schedule a complimentary consultation today.
Treating Lower-order Aberrations
All types of LASIK improve patients' vision by reshaping the cornea. Corneas that produce clear vision are sphere-shaped and uniform. In a patient with nearsightedness (myopia), the curvature of the cornea is too steep, which makes distant objects look blurry. In a patient with farsightedness (hyperopia), the cornea is too flat or the eye is too short, which makes close images appear blurry. Both are caused by the improper focusing of light on the retina, the light-sensitive tissue at the back of the eye. Astigmatism can produce either nearsightedness or farsightedness, and is the result of an irregular curvature of the cornea. During treatment, we flatten the cornea to correct nearsightedness and we steepen the cornea to correct farsightedness. To correct astigmatism, we sculpt the cornea into a more uniform shape. Only a microscopic amount of tissue needs to be removed. The changes allow the light to focus properly to give you normal vision.
LASIK can treat even severe cases of nearsightedness, but only moderate farsightedness or astigmatism. LASIK is not intended to correct keratoconus, a bulging of the cornea that causes distortion in a sufferer's vision. Other keratoconus treatment is available.
Treating Higher-order Aberrations
Advanced forms of LASIK surgery allow us to correct the smaller eye irregularities that comprise the higher-order aberrations. These visual errors are more complex, and they are described by the shape and severity of the deviation of the light rays passing through the cornea. They are known as coma, trefoil, and spherical aberration. Coma mostly affects night vision, lending a smeared quality to lights. It can also result in double vision. Trefoil makes the light appear to smear out in three directions. Spherical aberrations are associated with halos, starbursts, and inability to see fine detail. By using wavefront technology to analyze the eye, we can correct these aberrations with a custom LASIK procedure.
Higher-order aberrations are actually one of the risks of LASIK that can arise when the flap is created. However, blade-free LASIK, which uses a femtosecond laser to create the flap, reduces this risk by minimizing invasiveness. Wavefront analysis also minimizes risk by creating an extremely detailed map of the eye.
If you are not a candidate for LASIK, we offer several alternatives. Photorefractive keratectomy (PRK) is quite similar to LASIK and produces excellent outcomes. Some patients even choose PRK surgery when they could have LASIK because it is better suited to their lifestyle. Other LASIK alternatives include implantable contact lenses, inlays, and more.
When you choose to undergo your eye surgery with us, you will be in the hands of a leading-edge laser eye surgery team with years of experience delivering safe, effective results. We are also known for our personalized vision services and caring touch. To learn more about achieving the clear vision you deserve, contact us today.