20. history of anterior segment surgery or trauma in either eye which would affect corneal sensitivity (e.g., cataract surgery, Photorefractive keratectomy (PRK), Laser-Assisted Sub-Epithelial Keratectomy (or Laser Epithelial Keratomileusis) (LASEK/LASIK) or any surgery involving a limbal or corneal incision) within the last 12 months;