Brow ptosis is a common cause of tired or droopy eyelids. The brow is like a curtain rod that holds the upper eyelid in place. If the curtain rod is too low, then the curtain (upper eyelid) becomes saggy. When the eyebrow has descended from its normal anatomical position and begun to sag or droop, this can impact your vision and be aesthetically displeasing. It is often caused by age, injury, or damage to the forehead lifting nerve. A brow lift can be performed to treat ptosis. This can help restore your vision and alleviate cosmetic concerns.