Eyes open wide with Extensions Talk about an eye-opening experience: Eyelash extensions are the latest beauty trend sweeping the red carpet and heading to a salon near you. Not to be confused with the self-stick falsies of yesteryear, these semi-permanent, synthetic extensions are glued on one by one by a technician using tweezers and adhesive. "In the last couple of years, we've gone through an intense phase of fake eyelashes, and this is the logical extension -- pardon the pun," says Didi Gluck, Marie Claire magazine's beauty director. "It dovetails a little bit with the craze for hair extensions." During the application, which takes about 90 minutes, 25 to 35 extensions in varying lengths and thicknesses are bonded to individual hairs. The procedure averages $250 to $300 but can run as high as $500. The lashes stay put for about four to six weeks, but customers usually come back for a touch-up every two weeks.