Spot size and quality of scanning laser correction of higher-order wavefront aberrations.

作者: David Huang , Muhammad Arif , None

DOI: 10.1016/S0886-3350(01)01163-4

关键词:

摘要: Abstract Purpose To investigate the effect of laser spot size on outcome aberration correction with scanning corneal ablation. Setting Cleveland Clinic Foundation, Cleveland, Ohio, USA. Methods Corrections wavefront aberrations Zernike modes from second to eighth order were simulated. Gaussian and top-hat beams 0.6 2.0 mm full-width-half-maximum diameters modeled. The fractional secondary (distortion) evaluated. Results Using a distortion/correction ratio less than 0.5 as cutoff for adequate performance, or smaller beam was spherocylindrical (Zernike order), 1.0 up fourth-order modes, sixth-order modes. Conclusions Since ocular above fourth are relatively insignificant in normal eyes, current lasers diameter theoretically capable eliminating most higher-order aberrations.

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