It is not uncommon for someone to have a corneal scar from a contact lens infection. It is still potentially possible to have laser eye surgery if this is the case, but you must seek expert from advice from your treating ophthalmologist.
Factors to consider are the position of the corneal scar - for example, is it in your line of sight and what is its depth? At Visualase, you always have your consultation with your treating surgeon and he is best placed to tell you whether or not you are suitable for treatment.
All eye surgical procedures carry a level of risk including not obtaining the desired outcome, through to varying levels of visual loss. Your eye surgeon will discuss the risks and benefits, including ones specific to your circumstances, at the time of your pre-operative consultation.