Normally cornea is a piece of clear and transparent covering on eye balls. Corneal haze refers the the impaired vision caused by cloudy or opaque cornea. It is caused by cell inflammation or debris from trauma or infection or surgery. Corneal haze is rare but possible to happen after PRK or Lasik surgery. With corneal haze, patient might have blurred and defocused vision. Minor corneal haze won't cause big vision problem. If it is severe, you might feel your night vision is terribly poor. Because in dim circumstances, you will see big light halos around light sources, or glare. This is annoying to some extent and I think it is better not to drive in night with corneal haze. Ususally it is just temporary symptom after the PRK or Lasik surgery, which will go off within months. If one has serious problem, he/she should talk the ophthalmologist at the earliest.