1. Comparing laser in situ keratomileusis and photorefractive keratectomy in different eyes of the same patient. Joseph Frucht-Pery, MD, Faik Orucov, MD*, David Landau, MD, Eyal Strassman, MD, Abraham Solomon, MD Department of Ophthalmology, Hadassah University Hospital; School of Medicine – Hebrew University, Jerusalem, Israel

2. PURPOSE To compare visual outcome of laser in situ keratomileusis (LASIK) and photorefractive keratectomy (PRK) in fellow eyes. VS LASIK

3. METHODS  50 myopic patients who underwent LASIK in one eye and PRK in the fellow eye.  DECISION FOR PRK: when we couldn't do LASIK: - I-S ratio greater than 1.4 - Residual stromal bed ≤ 250μ - CCT ≤ 470μ  Minimum F/U 6 months. VS LASIK

4. RESULTS PREOP I-S 0.73 D 1.04 D PRK LASIKP 0.002 SEQ -4.13± 2.06 D -4.75±2.80 D 0.209 BCVA 0.99 0.97 0.140 VS LASIK

5. RESULTS POSTOP UCVA 0.98± 0.21 0.96± 0.27 0.466 PRK LASIKP SEQ -0.17 ± 0.32D -0.07± 0.50 D 0.225 BCVA 1.04± 0.12 1.03± 0.18 0.861 Safety Index 1.05± 0.11 1.07± 0.16 0.367 Efficacy Index 0.98± 0.20 0.98± 0.24 0.991 VS LASIK

6. RESULTS VS LASIK POSTOPERATIVE UCVA Postoperative UCVA  ≥20/40; 100% in LASIK, 92% in PRK  ≥20/20;74% in LASIK, 66% in PRK

7. RESULTS The BCVA  Improved 14 (28.0%) and in 19 (38.0%) patients in LASIK and PRK  Unchanged 31(62.0%) and in 26 (52.0%) patients in LASIK and PRK  Decreased 5 (10.0%) and in 5 (10.0%) patients in LASIK and in PRK 5 10.0% 5 10.0% 31 62.0% 26 52.0% 14 28.0% 19 38.0% LASIK PRK VS LASIK

8. RESULTS  Change in BCVA pre- post operatively  Postoperative SEQ LASIKPRK 0.99 1.04 0.97 1.03 preoperative postoperative LASIK PRK 44 88% 5 10% 1 2% 44 88% 5 10% 1 2% VS LASIK

9. CONCLUSION There is no difference in the outcome of LASIK and PRK in the fellow eye. VS LASIK