TY - JOUR
T1 - Spot size and quality of scanning laser correction of higher-order wavefront aberrations
AU - Huang, David
AU - Arif, Muhammad
N1 - Funding Information:
Supported in part by Whitaker Foundation Grant RG-99-0302.
PY - 2002
Y1 - 2002
N2 - Purpose: To investigate the effect of laser spot size on the outcome of aberration correction with scanning laser corneal ablation. Setting: Cleveland Clinic Foundation, Cleveland, Ohio, USA. Methods: Correction of wavefront aberations of Zernike modes from the second to eight order were stimulated. Gaussian and top-hat beams of 0.6 to 2.0 mm full-width-half-maximum diameters were modeled. The fractional correction and secondary aberration (distortion) were evaluated. Results: Using a distortion/correction ratio of less than 0.5 as a cutoff for adequate performance, a 2.0 mm or smaller beam was adequate for spherocylindrical correction (Zernike second order), a 1.0 mm or smaller beam was adequate for correction of up to fourth-order Zernike modes, and a 0.6 mm or smaller beam was adequate for correction of up to sixth-order Zernike modes. Conclusions: Since ocular aberrations above the Zernike fourth order are relatively insignificant in normal eyes, current scanning lasers with a beam diameter of 1.0 mm or less are theoretically capable of eliminating most higher-order aberrations.
AB - Purpose: To investigate the effect of laser spot size on the outcome of aberration correction with scanning laser corneal ablation. Setting: Cleveland Clinic Foundation, Cleveland, Ohio, USA. Methods: Correction of wavefront aberations of Zernike modes from the second to eight order were stimulated. Gaussian and top-hat beams of 0.6 to 2.0 mm full-width-half-maximum diameters were modeled. The fractional correction and secondary aberration (distortion) were evaluated. Results: Using a distortion/correction ratio of less than 0.5 as a cutoff for adequate performance, a 2.0 mm or smaller beam was adequate for spherocylindrical correction (Zernike second order), a 1.0 mm or smaller beam was adequate for correction of up to fourth-order Zernike modes, and a 0.6 mm or smaller beam was adequate for correction of up to sixth-order Zernike modes. Conclusions: Since ocular aberrations above the Zernike fourth order are relatively insignificant in normal eyes, current scanning lasers with a beam diameter of 1.0 mm or less are theoretically capable of eliminating most higher-order aberrations.
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U2 - 10.1016/S0886-3350(01)01163-4
DO - 10.1016/S0886-3350(01)01163-4
M3 - Article
C2 - 11973085
AN - SCOPUS:0036189248
SN - 0886-3350
VL - 28
SP - 407
EP - 416
JO - Journal of cataract and refractive surgery
JF - Journal of cataract and refractive surgery
IS - 3
ER -