May 2008
Volume 49, Issue 13
ARVO Annual Meeting Abstract  |   May 2008
Maximum Disparity After Lasik
Author Affiliations & Notes
  • J. J. Castro
    Optics, University of Granada, Granada, Spain
  • J. R. Jiménez
    Optics, University of Granada, Granada, Spain
  • E. Hita
    Optics, University of Granada, Granada, Spain
  • R. G. Anera
    Optics, University of Granada, Granada, Spain
  • Footnotes
    Commercial Relationships  J.J. Castro, None; J.R. Jiménez, None; E. Hita, None; R.G. Anera, None.
  • Footnotes
    Support  Ministerio de Educación y Ciencia (Spain) grant FIS2006-01369 and Junta de Andalucía (Spain) grant P06-FQM-01359
Investigative Ophthalmology & Visual Science May 2008, Vol.49, 5645. doi:
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      J. J. Castro, J. R. Jiménez, E. Hita, R. G. Anera; Maximum Disparity After Lasik. Invest. Ophthalmol. Vis. Sci. 2008;49(13):5645. doi:

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      © ARVO (1962-2015); The Authors (2016-present)

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Purpose: : To evaluate stereoscopic vision after LASIK and the role of post-surgical interocular differences in higher-order eye aberrations, corneal asphericity, and initial anisometropia.

Methods: : We measured maximum disparity with a mirror stereoscope pre-(best-corrected) and after LASIK for 30 patients. Their mean pre-operative spherical refractive error was -4.7±2.0 D, ranging from -1.0 to -8.0 D. Data on aberrometry were taken with a WASCA aberrometer. Corneal shape data were provided by a corneal topographer. For each patient, the anisometropia was computed as the difference between the spherical equivalent of each eye.

Results: : The results showed that stereoscopic vision is less effective after LASIK, since for 93% of the patients, maximum disparity diminished. This lower maximum disparity implies a reduction in the physical region where stereoscopic perception occurs and thus in the quality of stereopsis. We also found that the larger the interocular-differences in post-surgical corneal asphericity the less effective the stereopsis (r=0.82, p<0.01); on the other hand, the greater the differences in the higher-order aberrations, the worse the quality of stereoscopic vision (r=0.85, p<0.01). Analyzing pre-LASIK anisometropia we found that maximum disparity diminishes for increasing values of initial anisometropia (r=0.87, p<0.01).

Conclusions: : Our results indicate that stereopsis deteriorates after LASIK. Ablation algorithms should minimize interocular-differences (aberrations and corneal aasphericity) to avoid a decrease in binocular visual performance.

Keywords: binocular vision/stereopsis 

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