Format

Send to:

Choose Destination
See comment in PubMed Commons below
J Cataract Refract Surg. 2002 Mar;28(3):407-16.

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

Author information

  • 1Cleveland Clinic Foundation, Cleveland, Ohio 44195, USA. huangd@ccf.org

Abstract

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:

Corrections of wavefront aberrations of Zernike modes from the second to eighth order were simulated. 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.

PMID:
11973085
[PubMed - indexed for MEDLINE]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Elsevier Science
    Loading ...
    Write to the Help Desk