The vast majority of people who undergo refractive surgery (such as LASIK, LASEK, PRK, or Radial Keratotomy) end up with a very good result and excellent vision. However, with every surgery there is a risk and some people are less than happy with their results. In some unfortunate cases there can be extreme complications.
The removal of too much corneal tissue can result in secondary keratoconus, or a distorted corneal surface. Even if the result is labelled ‘good’ and the visual acuity is ’20/20′, there can be problems with visual disturbances such as glare, starburst, ghosting and halos.