Lasik (Laser Assisted In Situ Keratomileusis) is a laser surgical procedure designed to reduce or eliminate a patient’s need for glasses or contact lenses in order to have sharp visual acuity.
To understand Lasik we should first review how the eye functions. The eye is like a non-digital camera with a front piece (the cornea), a lens, and film in the back (the retina). The front of the eye, the cornea is also a lens, and together with the lens inside the eye focus an image of what we see on the retina which like film in a camera takes a picture and sends it to our brain. If the image on the retina is out of focus because of myopia, hyperopia, or astigmatism then a person needs glasses or contact lenses to see clearly.
Lasik reduces or eliminates the need for glasses by using cool concentrated laser light to change the shape of the cornea so that a sharp image of what we are looking at is focused on the retina. Lasik involves making a flap in the cornea with a mechanical blade or preferably with a special laser (Femto Laser). Then a different laser (Excimer Laser) is used to change the shape of the cornea. The flap is then repositioned and naturally seals into place within minutes.