To get a flawless lasting look that always stands out: insert lashes through opening and center them.  Rest upper bar of curler on eyelid to prevent pinching.  Squeeze curler, gently but firmly.  Hold a few seconds.  Repeat until desired curl is achieved.
 
Currently covered by U.S. Patent No. 4,993,439 (expiration date May 17, 2010).  Formerly covered by Design Patent No. 328,504 (expired August 4, 2006)

For an amplified look — try lightly heating the pad of this curler with a blow dryer to create a super-strong, reinforced curl. (Only do this with this curler, never a metal one!)