A brow or forehead lift (in reality, an upper face lift) does not substitute for an eyelid lift, and vice versa.
Each operation is directed at a different problem and achieves a different outcome. When indicated by the patient's condition, the two procedures may sometimes be performed simultaneously.
Unless there is clear evidence that the forehead has actually drooped, however, conservatism is wise when considering a lift. The highly arched and elevated brow so popular during the 1950s (then a product of eyebrow plucking and pencil) is now not only considered a dated look but also a give-away that one has undergone cosmetic surgery. Today's stylish young adults do not sport highly elevated brows (examine the models in any fashion magazine or a photo of yourself at age twenty).
When indicated, a forehead lift can be an excellent procedure to combat the effect of true upper face descent, but it is does not duplicate the improvement obtained from a well-done upper blepharoplasty.