###Rationale: *Corneal Reshaping procedures such as photorefractive keratectomy (PRK) and Laser Assisted is Situ Keratomileusis (LASIK) are performed by lasers in the ultraviolet wavelength of 193nm to 213 nm. The most commonly used laser for such procedures is the Argon Fluride Excimer Laser (ARF) with a length of 193nm. Ref: Yanoff 3rd/e p.43

###Answer: OPTION A IS CORRECT.
###Question: The wavelength of laser {in nanometers} for shaping cornea in refractive surgery is-
###Options:
A. 193 nm
B. 451 nm
C. 532 nm
D. 1064nm
