 The stretching-out of muscle is due to age.The frontalis sling surgery is done to either tighten or shorten the affected muscles, thereby allowing the process to raise the patient’s lid’s resting position.The procedure is done with the doctor using the sling to loop the material, then threading it underneath the patient’s eyebrows and above the lashes.Once the sling has been tightened, this allows the patient’s forehead’s muscle to aid in lifting the lid.