EyeWorld is the official news magazine of the American Society of Cataract & Refractive Surgery.
Issue link: https://digital.eyeworld.org/i/78708
54 EWInternational "pseudoaccommodation," which en- ables them to see better at various distances. Once again, we underline that the effect of multifocal reprofil- ing is "automatically" achieved (i.e., the ray makes no special actions and June 2012 mechanical manipulations, just a relevant value of energy density chosen for the laser). Since 2004, Ost-Optic K Co. Ltd. has used an optimized version of the excimer laser on the cornea as well as a corrected plan of rehabilitation treatment after performing trans- PRK. This enabled the company to considerably increase the number of patients whose vision could be cor- rected. This included patients with a low initial corrected visual acuity. The total distribution of pre-op Figure 6. Trans-PRK CDVA before surgery Figure 3. Trans-PRK value of correction: Sph –10.0, best spectacle-corrected visual acuity pre-op. The uncorrected visual acuity 1.5 months later was –0.5. The patient was a 44-year-old female Figure 7. Trans-PRK total result Figure 4. Trans-PRK value of correction: Sph –19.0, pre-op corrected distance visual acuity. The uncorrected visual acuity 8 months later was 0.2. The patient was a 34- year-old female Figure 8. Trans-PRK: Change in Snellen lines of CDVA Pre-op myopia Number of eyes CDVA lower than 0.5 From –0.5 From –3.25 to –3.0 D 1,481 1 to –5.75 D 2,769 10 From –6.0 Over to –15.0 D –15.25 D 2,125 42 Losses of maximum corrected 00 0 visual acuity <2 lines Losses of maximum corrected 04 1* visual acuity <2 lines *Eyes having losses of visual acuity not connected with refraction such as a detached retina or central neovascular membrane (CNM). Figure 5. Trans-PRK pre-op myopia distribution Table 2. Trans-PRK Safety criterion 42 3 2* 1*