In the relationship between the lab and the optician, nothing is more agreed on than the aggravation of redoes and remakes. No one wins when a job has to go back to the lab to be redone.
Above all else, the patient has to experience a delay in receiving their new glasses. Often these delays can harm your reputation as an eye care professional. When the delay goes on long enough it could cost you return business and even force a refund and lost sale.