Analysis of correlation between corneal topographical data and visual performance

Chuanqing Zhou; Lei Yu; Qiushi Ren

doi:10.1117/12.700580

5 March 2007 Analysis of correlation between corneal topographical data and visual performance

Chuanqing Zhou, Lei Yu, Qiushi Ren

Proceedings Volume 6426, Ophthalmic Technologies XVII; 64260N (2007) https://doi.org/10.1117/12.700580
Event: SPIE BiOS, 2007, San Jose, California, United States

Abstract

Purpose: To study correlation among corneal asphericity, higher-order aberrations and visual performance for eyes of virgin myopia and postoperative laser in situ keratomileusis (LASIK). Methods: There were 320 candidates 590 eyes for LASIK treatment included in this study. The mean preoperative spherical equivalence was -4.35±1.51D (-1.25 to -9.75), with astigmatism less than 2.5 D. Corneal topography maps and contrast sensitivity were measured and analyzed for every eye before and one year after LASIK for the analysis of corneal asphericity and wavefront aberrations. Results: Preoperatively, only 4th and 6th order aberration had significant correlation with corneal asphericity and apical radius of curvature (p<0.001). Postoperatively, all 3th to 6th order aberrations had statistically significant correlation with corneal asphericity (p<0.01), but only 4th and 6th order aberration had significant correlation with apical radius of curvature (p<0.05). The asymmetrical aberration like coma had significant correlation with vertical offset of pupil center (p<0.01). Preoperatively, corneal aberrations had no significant correlation with visual acuity and area under the log contrast sensitivity (AULCSF) (P>0.05). Postoperatively, corneal aberrations still didn't have significant correlation with visual acuity (P>0.05), but had significantly negative correlation with AULCSF (P<0.01). Corneal asphericity had no significant correlation with AULCSF before and after the treatment (P>0.05). Conclusions: Corneal aberrations had different correlation with corneal profile and visual performance for eyes of virgin myopia and postoperative LASIK, which may be due to changed corneal profile and limitation of metrics of corneal aberrations.

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Chuanqing Zhou, Lei Yu, and Qiushi Ren "Analysis of correlation between corneal topographical data and visual performance", Proc. SPIE 6426, Ophthalmic Technologies XVII, 64260N (5 March 2007); https://doi.org/10.1117/12.700580

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KEYWORDS

Visualization

LASIK

Monochromatic aberrations

Wavefront aberrations

Contrast sensitivity

Eye

Cornea

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