def. Femtosecond: 0.000000000000001 seconds, or, one millionth of one billionth of a second, is the definition of a femtosecond. Can you imagine the precision of this technology in a laser? ReVision is one of the first sites in Ohio to have a Bausch & Lomb Victus Femtosecond Laser. This laser is used in both cataract and LASIK surgery, and has been one of the most recent innovations in this industry. When you come in to see us, we will make sure you understand the benefits of this revolutionary technology and how it can optimize your results.