Thermal Effects of Laser Eye Correction on the Cornea

Abstract

Eye laser surgery such as Photo Refractive Kerotectomy (PRK) has been the most recent technology towards correcting vision disorders. However, 20/20 vision is not guaranteed and side effects are possible. By measuring the properties of the patient's cornea, the surgeon can customize the laser surgery procedure for more accurate results. Using GAMBIT and FIDAP, two dimensional (2D) design simulations of the cornea in contact with a laser beam were used to determine the optimal surgical time for laser eye correction.

Three dimensional (3D) simulations were designed for an off center laser and four coupled lasers in contact with the cornea. Results indicated a directly proportional relationship between corneal density and conductivity with ablation time. An indirect relationship existed between laser power and time for ablation. Design simulations indicated a longer ablation time compared with centered lasers, but can be useful for specific vision disorders such as hyperopia.