What does shortsightedness do to your eyes?
Your eye as an optical system that consists of two structures:
• The cornea and lens, which is the light refrecting element, such as an analog camera lens
• The retina, which is the light receptive part with the nerve endings going to the brain,
With shortsightedness (myopia), light rays are focused not on the retina of the eye, but beforeit, so the visual image on the retina falls”out of focus.”
Incidentally, the very fabric of the cornea – optical biological tissue – is a scientific mystery.Scientists still cannot explain why the living tissue is transparent,but the use of its properties has already been learned.
What can a laser do with your eyes?
Laser eye correction can help obtain a clear picture in two ways. First, the correct focal distance from the “lens” of the cornea to the retinais corrected. Second, the “lens” is replaced so that the refractive power of lens-corneal allows retina be in focus. For this Dr. Boothe uses the laser to change the profile of the cornea.Redesigning the cornea is the essence of laser correction procedure.
a. Myopia is treated by using the laser to remove the corneal tissue from the central zone and the cornea becomes flatter
b. Hyperopia is treated by using the laser to remove the corneal tissue from the periphery, and the cornea becomes more convex
c. Astigmatism is treated by using laser to remove corneal tissue from variousareas so that the cornea becomes uniform.
Excimer laser situ keratomileusis (Lasik)
Today Lasik eye correction surgery is the latest in laser vision correction. This method of laser correction combines microsurgical and laser techniques.For 2-3 seconds a microsurgical automatic machine – the microkeratome – cuts the corneal epithelium in the form of a circular flap of 8 mm diameters on a stalk and leans back, like a lid.Then, using a laser beam, parts of the cornea are evaporated, creating a new profile.Then the “lid” – a flap of epithelium – is closed.No seams, and recovery time of the epithelium is not required, as the protective layer of the cornea is not damaged, so the patient does not experience discomfort after the surgery. It is possible to have laser eye correction on two eyes at once.
An important advantage of laser correction of myopia is that it does not involve, in contrast to all other surgical procedures, no new limitations in the future.However, the chance of deteriorating health in general or after the operation is not higher than the possible side effects and complications of wearing glasses or contact lenses. Laser surgery is also attractive because it is:
- Completely contactless (laser eye surgery is performed by means of the light beam), which eliminates the risk of infection
- A quick and easy operation
- Done using precise calculations withcomputer technology so the results are the best possible