An adjustable suture is a type of slip-knot that is used to hold a muscle in place; however, this special suture allows the surgeon to re-adjust the position of the eye after the surgery is completed and the patient has had the opportunity to wake-up from anesthesia. At that time, if the eyes are not completely straight, the suture can be manipulated to move the muscle either forward or back to help resolve any residual misalignment. Once the patient and the surgeon are pleased with the alignment of the eyes, the suture is tied down and cut and can no longer be used to change the position of the eye.