Lasik and PRK are two different types of laser surgeries that can improve vision. Both Lasik and PRK are popular surgeries and are deemed to be safe. The difference between Lasik and PRK is technical and the manner in which the surgeries are carried out. There is no difference between Lasik and PRK when it comes to the conditions they can cure or the eventual outcome.
Difference Between Lasik and PRK
Let us first quickly check out the similarities between Lasik and PRK. Both Lasik and PRK are recommended to treat nearsightedness, farsightedness and astigmatism. The surgical procedures change the shape of the cornea permanently using laser. However, the manner in which the laser is used and how the shape of the cornea is changed will vary depending on whether you choose Lasik or PRK.
Now, let us highlight the principal difference between Lasik and PRK. During Lasik surgery, a flap is created in the cornea. In PRK surgeries, no such flap needs to be created. The flap is usually hinged and is created in the central layer of the cornea. Once the flap is created, it is folded to access the corneal layers and then the laser is used to reshape those layers. In PRK surgeries, no such flap is created so the outer surface which is known as epithelium is removed. This outer layer or epithelium is discarded. With the outer layer or surface removed, the laser can access the deeper layers which are then reshaped using the same laser and the same process as is used in Lasik. The way the corneal layers are accessed is the surgical difference between Lasik and PRK.
Since the process varies, not everyone is suitable for either or both procedures. Most ophthalmologists agree that PRK has more disadvantages than Lasik. However, those who do not qualify or are not suitable for Lasik will have to settle for PRK surgery. PRK surgery usually has a longer recovery period, there can be substantial discomfort during the recovery process, the results may take a tad longer to be obvious and the fact that the outermost layer of the cornea is removed and discarded may make most people uncomfortable.
However, not everyone will be suitable for Lasik surgery wherein the flap needs to be created. The outermost layer that is removed during PRK actually grows back, even if it takes a while. Hence, there is really not much of a difference in the absolute outcome. Those who have thin corneas or steep corneas and have a history of dry eye syndrome or have large pupils will not be suitable for Lasik.
