LASIK is eye surgical treatment that permanently alters the shape of the cornea (the clear covering on the front of the eye). It is done to enhance vision as well as lower an individual’s need for glasses or contact lenses.
For clear vision, the eye’s cornea and lens should bend (refract) light rays correctly, which means that the light rays should get focused on to the retina, the light sensitive part at the back of the eye, so that an image in the form of nerve signals can then be transmitted to the brain. This allows images to be focused on the retina. Or else, the images will certainly be blurry.
This blurriness is described as a “refractive error.” It is brought on by a difference in between the form of the cornea (curvature) and also the length of the eye.
LASIK uses an excimer laser (an ultraviolet laser) to eliminate a thin layer of corneal cells to reshape the cornea so that light now bends or refracts differently and correctly. This provides the cornea a brand-new shape so that light rays are focused clearly on the retina.
LASIK causes the cornea to be thinner
LASIK is an outpatient operation and does not require hospitalisation. It will just take 10 to 15 mins to do for each eye and you can then recuperate at home with periodic eye doctor visits prescribed.
The only anaesthetic used is eye drops that numb the surface of the eye. The procedure is done when you are awake, but you will get medication to help you loosen up. LASIK might be done on one or both eyes through the same session.
To do the treatment, a flap of corneal tissue is created which is after that peeled back to ensure that the excimer laser can improve the corneal tissue below. A hinge upon the flap prevents it from being totally separated from the cornea.
When LASIK was first done, a unique automated knife (a microkeratome) was made use of to cut the flap. Currently, a much more common and also much safer approach is to make use of a different sort of laser (femtosecond) to create the corneal flap.
The quantity of corneal tissue the laser will eliminate or remove is determined beforehand. The doctor will compute this based on a number of factors consisting of:
– Your glasses or contact lens prescription, indicating the measurements and type of refractive error
– A wave-front test, which gauges exactly how light travels through your eye, to indicate just how the reshaping should be done
– The form of your cornea surface and its unevenness
When the reshaping is done, the surgeon replaces and secures the flap. No stitches are required and the cornea will heal itself very quickly. The cornea will naturally hold the flap in place and your vision is corrected for life, except for other conditions which may develop with age like presbyopia.