Journal article
Higher-order aberration measurements: Comparison between Scheimpflug and dual Scheimpflug-Placido technology in normal eyes.
- Piccinini AL Keck School of Medicine, University of Southern California, Los Angeles, USA; Sadalla Amin Ghanem Eye Hospital, Joinville, SC, Brazil.
- Golan O Keck School of Medicine, University of Southern California, Los Angeles, USA; Department of Ophthalmology, Tel Aviv Souraski Medical Center, Tel Aviv, Israel; Tel Aviv University, Tel Aviv, Israel.
- Hafezi F Keck School of Medicine, University of Southern California, Los Angeles, USA; USC Roski Eye Institute, Los Angeles, USA; ELZA Institute, Dietikon/Zurich, Switzerland; Ocular Cell Biology Group, University of Zurich, Zurich, Switzerland; University of Wenzhou, Wenzhou, China.
- Randleman JB Keck School of Medicine, University of Southern California, Los Angeles, USA; USC Roski Eye Institute, Los Angeles, USA. Electronic address: randlema@usc.edu.
- 2019-02-05
Published in:
- Journal of cataract and refractive surgery. - 2019
Adult
Corneal Wavefront Aberration
Diagnostic Imaging
Diagnostic Techniques, Ophthalmological
Female
Healthy Volunteers
Humans
Keratomileusis, Laser In Situ
Lasers, Excimer
Male
Middle Aged
Photography
Refraction, Ocular
Retrospective Studies
Visual Acuity
Young Adult
English
PURPOSE
To compare higher order aberrations (HOAs) in normal eyes between a Scheimpflug imaging system (Pentacam HR) and dual Scheimpflug-Placido imaging system (Galilei G4).
SETTING
Emory University, Atlanta, Georgia, and the University of Southern California, Los Angeles, USA.
DESIGN
Retrospective case series.
METHODS
Eyes screened for refractive surgery were evaluated sequentially using a Scheimpflug device and a dual Scheimpflug-Placido device. Differences, correlations, and agreement between values for total root mean square (RMS), trefoil, coma, and spherical aberration were analyzed, and Bland-Altman plots were generated.
RESULTS
One hundred five eyes of 105 patients (44 men, 61 women) were evaluated. Total RMS, coma, and trefoil were significantly different between groups (all P < .001), while spherical aberration values were not. There was moderate correlation between devices for trefoil (r = 0.475 to 0.652), coma (r = 0.574 to 0.651), and spherical aberration (r = 0.483) and a strong correlation for total cornea RMS (r = 0.817). There was no directional bias between groups. The 95% limits of agreement for absolute values was 0.039 μm for trefoil at 30 degrees, 0.405 μm for trefoil at 0 degree, 0.553 μm for horizontal coma, 0.545 μm for vertical coma, 0.318 μm for spherical aberration, and 0.617 μm for RMS.
CONCLUSIONS
A Scheimpflug imaging device and dual Scheimpflug-Placido imaging device generated statistically different values for total cornea HOAs; however, the correlation between devices was moderate to strong and there was reasonable agreement in all measures for normal eyes. Based on these findings, the devices appear functionally equivalent for clinical use, although caution is warranted for outcomes-based research protocols that report HOAs.
To compare higher order aberrations (HOAs) in normal eyes between a Scheimpflug imaging system (Pentacam HR) and dual Scheimpflug-Placido imaging system (Galilei G4).
SETTING
Emory University, Atlanta, Georgia, and the University of Southern California, Los Angeles, USA.
DESIGN
Retrospective case series.
METHODS
Eyes screened for refractive surgery were evaluated sequentially using a Scheimpflug device and a dual Scheimpflug-Placido device. Differences, correlations, and agreement between values for total root mean square (RMS), trefoil, coma, and spherical aberration were analyzed, and Bland-Altman plots were generated.
RESULTS
One hundred five eyes of 105 patients (44 men, 61 women) were evaluated. Total RMS, coma, and trefoil were significantly different between groups (all P < .001), while spherical aberration values were not. There was moderate correlation between devices for trefoil (r = 0.475 to 0.652), coma (r = 0.574 to 0.651), and spherical aberration (r = 0.483) and a strong correlation for total cornea RMS (r = 0.817). There was no directional bias between groups. The 95% limits of agreement for absolute values was 0.039 μm for trefoil at 30 degrees, 0.405 μm for trefoil at 0 degree, 0.553 μm for horizontal coma, 0.545 μm for vertical coma, 0.318 μm for spherical aberration, and 0.617 μm for RMS.
CONCLUSIONS
A Scheimpflug imaging device and dual Scheimpflug-Placido imaging device generated statistically different values for total cornea HOAs; however, the correlation between devices was moderate to strong and there was reasonable agreement in all measures for normal eyes. Based on these findings, the devices appear functionally equivalent for clinical use, although caution is warranted for outcomes-based research protocols that report HOAs.
- Language
-
- English
- Open access status
- bronze
- Identifiers
-
- DOI 10.1016/j.jcrs.2018.11.015
- PMID 30713018
- Persistent URL
- https://sonar.ch/global/documents/47705
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