S. Heydarian - M.Sc. in Optometry, Faculty of Para Medical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran
M. Jabarvand Behrooz - Associate Professor, Ophthalmology Dept., Farabi Hospital, Tehran University of Medical Sciences, Tehran, Iran
E. Jafarzadehpour - Assistant Professor, Optometry Dept., Faculty of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran
R. Vahabbi - M.Sc. in Optometry, Faculty of Rehabilitation Sciences, Iran University of Medical Sciences, Mashhad, Iran

Introduction: contrast sensitivity is one of the most important psychophysical tests that may be used for the evaluation of refractive state of eye and retinal image quality. Yellow vs. blue color contrast sensitivity may be more suitable in this regard. Materials and Methods: thirty myopic eyes were considered in this study. Yellow vs. blue color contrast sensitivity was evaluated under the same environment and conditions in these individuals pre and post LASIK. Results: The comparison of yellow vs. blue color contrast sensitivity with glasses pr e and post LASIK shows a significant improvement (p<۰.۰۰۱) in the contrast sensitivity. Discussion and Conclusion: The improvement of optical state of the eye is the main reason for the improvement of contrast sensitivity. The reason behind performing LASIK surgery and surgeon's experience on one hand, and the undesirable quality of glasses due to the lack of standard in the manufacturing and glazing of correcting lenses on the other hand are the main factors behind the improvement of optical state of the eye.

Contrast Sensitivity, LASIK, Opponent Color Contrast, Optical Aberrations