The relative position of the eyelid in relation to the lower cheek bone. This is usually an inherited trait. People with midface volume loss often have a negative eyelid-cheek vector. The vector is positive if the cheek bone rests in front of the eyelid. The vector is termed a “negative” vector if the eyelid rests in front of the cheek bone. Negative vector patients may require volume augmentation with fillers or fat grafting during eyelid surgery.