Comparison of Corneal Higher-Order Aberrations Measured with Two Instruments Using Scheimpflug Camera System

Choi, Yeon Jung; Kang, Na Hee; Jun, Roo Min

doi:10.3341/jkos.2015.56.10.1497

Cited by 9 publications

(3 citation statements)

References 19 publications

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“…Specifically, the SA value measured by a slit-scanning or a Placido disc-based topography are generally found to be lower than that measured by Scheimpflug imaging devices such as Galilei TM (Zeimer, Port, Switzerland) or Pentacam. As the SA measured by the dual Scheimpflug imaging Galilei is higher than that measured by the single Scheimpflug tomography of Pentacam, it is advisable to determine the normal range of each device before use [27,28]. For instance, the normative range of SA for Galilei is between +0.15 µm and +0.30 µm [29].…”

Section: Discussionmentioning

confidence: 99%

Limitations of and Solutions to Using 6 mm Corneal Spherical Aberration and Q Value after Laser Refractive Surgery

Choi,

Won,

et al. 2024

Bioengineering

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This study aimed to evaluate the spherical aberration (SA) in different corneal areas before and after femtosecond laser-assisted in situ keratomileusis (fLASIK) and transepithelial photorefractive keratectomy (tPRK), with the goal of identifying the limitations of and potential improvements in using SA within a 6 mm area. The study included 62 patients who underwent fLASIK and tPRK. Complete eye examinations including keratometry, corneal epithelial thickness, central corneal thickness, and topography were performed preoperatively and postoperatively. Anterior, posterior, and total corneal aberrations were measured preoperatively and three months postoperatively, with pupil diameters ranging from 2 to 8 mm. In the fLASIK group, compared to the preoperative SA, the anterior and total SA increased postoperatively in the 6 and 7 mm areas. In the tPRK group, meanwhile, the anterior and total SA of the 5 mm or larger areas increased postoperatively. An area of 6 mm or larger showed an increase in correlation with the changes in Q value and refractive correction. As the corneal SA and asphericity in the 6 mm zone cannot specifically demonstrate the status of areas smaller than 6 mm or changes in the optical zone after laser refractive surgery, comparison with normal values in various areas of the cornea is necessary.

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Section: Discussionmentioning

confidence: 99%

Limitations of and Solutions to Using 6 mm Corneal Spherical Aberration and Q Value after Laser Refractive Surgery

Choi,

Won,

et al. 2024

Bioengineering

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“…[26][27][28] When comparing Scheimpflug and dual Scheimpflug-Placido devices, Choi et al noted high repeatability but the devices were not found to be interchangeable. 26 Hao et al reported significant differences for total and internal HOAs but not for anterior HOAs when comparing the devices kerato-refractometer KR-1 (Topcon Medical Systems, Inc.) and iTRace (Tracey Technologies). 27 Cade et al found good agreement in normal eyes using four aberrometers based on different software (Hartmann-Schack, ray tracing, and Tscherning), although HOA measures differed significantly among devices.…”

Section: Discussionmentioning

confidence: 99%

“…Other studies have shown variable agreement for HOA measures in normal corneas between devices based on different technologies. [26][27][28] When comparing Scheimpflug and dual Scheimpflug-Placido devices, Choi et al noted high repeatability but the devices were not found to be interchangeable. 26 Hao et al reported significant differences for total and internal HOAs but not for anterior HOAs when comparing the devices kerato-refractometer KR-1 (Topcon Medical Systems, Inc.) and iTRace (Tracey Technologies).…”

Section: Discussionmentioning

confidence: 99%

Agreement between anterior segment swept source-OCT and Scheimpflug imaging corneal aberration measurements in healthy eyes

Pérez-Bartolomé

Feu-Basilio

Rocha‐de‐Lossada

et al. 2022

European Journal of Ophthalmology

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Purpose To assess agreement between corneal aberration measurements made through swept-source optical coherence tomography using a new anterior segment imaging device (Anterion) and a Scheimpflug imaging device (Pentacam HR) in healthy subjects. Methods Cross-sectional study. In 50 eyes of 50 healthy subjects, 14 aberration parameters (7 across the anterior corneal surface and 7 across the total surface) were measured in 4 mm and 6 mm optic zones using each device: oblique trefoil (Z3_-3), vertical coma (Z3_-1), horizontal coma (Z3_1), horizontal trefoil (Z3_3), spherical aberration (Z4_0), root mean square (RMS) lower order aberrations (LOA) and RMS higher order aberrations (HOA). Data for the two devices were compared through intraclass correlation coefficients (ICC), paired t tests, limits of agreement (LoA) and Bland Altman plots. Results Vertical coma was the only corneal aberration parameter that consistently showed excellent agreement (ICC > 0.8, mean difference −0.019, LoA −0.165 to 0.126). Good agreement (ICC = 0.75) between the devices was observed for RMS HOA, but this was slightly worse in the 6 mm optical zone (ICC = 0.667 for anterior RMS HOA). No over- or underestimation trend by one or other device was noted. Agreement was poor to moderate for the rest of the corneal parameters (ICC 0.2 to 0.7). Conclusion Despite good agreement overall for vertical coma and RMS HOA values, agreement for the remaining corneal aberration measurements was poor to moderate. As mean differences in our sample were overall small, in normal eyes these devices could be clinically judged as interchangeable.

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Higher-order aberration measurements: Comparison between Scheimpflug and dual Scheimpflug–Placido technology in normal eyes

Piccinini

Golan

Hafezi

et al. 2019

Journal of Cataract and Refractive Surgery

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Comparison of Corneal Higher-Order Aberrations Measured with Two Instruments Using Scheimpflug Camera System

Cited by 9 publications

References 19 publications

Limitations of and Solutions to Using 6 mm Corneal Spherical Aberration and Q Value after Laser Refractive Surgery

Limitations of and Solutions to Using 6 mm Corneal Spherical Aberration and Q Value after Laser Refractive Surgery

Agreement between anterior segment swept source-OCT and Scheimpflug imaging corneal aberration measurements in healthy eyes

Higher-order aberration measurements: Comparison between Scheimpflug and dual Scheimpflug–Placido technology in normal eyes

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