Halos are frequent especially in the months after surgery. They tend to reduce with time. They are usually not noticed in everyday life but rather by night, while driving for example (dilated pupils). They also depend on the type of treatment (optical zone, amount of correction) that you perform, and for the quality/generation of the laser platform... Information is essential.

Chronic pain is usually related to dry eyes. Those patients should not be operated at all. Bad patient selection can result in terrible results.

Loss of visual acuity after refractive surgery is more than exceptionnal. It is usually manageable with hard contact lenses.

The special thing about refractive surgery is the contrast between its apparent easiness (non specialist eye surgeon will often refer to it as an "easy surgery, no technical difficulties") and the rapidity with which hard to treat complications can occur if everything does not go as planned. Little things (water drop on the cornea during the treatment, centration error, mismanagement of flap cut incidents...) can lead to disasters that you sometimes cannot repair.