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

Piccinini, Andre L; Golan, Oren; Hafezi, Farhad; Randleman, J. Bradley

doi:10.1016/j.jcrs.2018.11.015

Cited by 14 publications

(21 citation statements)

References 28 publications

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“…Regarding corneal HOAs, previous studies have reported the results of comparing HOAs measured by different devices. Piccinini et al [ 35 ] compared the HOAs using the Pentacam HR and Galilei G4, which were based on a dual Scheimpflug camera with a placido system in 105 eyes of 105 subjects. Total RMS, coma, and trefoil showed significant difference ( p < 0.001) but not in spherical aberration ( p = 0.125).…”

Section: Discussionmentioning

confidence: 99%

Agreement between Scheimpflug Camera and the Swept-source Optical Coherence Tomography Measurements in Keratometry and Higher-order Aberrations

Gim

Jun

Han

2021

Korean J Ophthalmol

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To evaluate the compatibility of corneal curvature and astigmatism, and higher-order aberrations (HOAs) measured by the Scheimpflug camera Pentacam HR and the swept-source optical coherence tomography ANTERION.Method: This prospective study included normal subjects with no ophthalmic history. Steep keratometry (K), flat K, astigmatism and its axis of the anterior and posterior surfaces, total corneal power, and HOAs using the two instruments were compared. To compare the mean values of the measurements, a paired t-test was used. Bland-Altman analysis was applied to assess the agreement between the two devices.Results: Fifty-three eyes of 53 subjects were evaluated. There were statistically significant differences for steep K, astigmatism, and vector J0, J45 in the anterior surface and total corneal power between the two devices (p<0.05). There were also significant differences in the most of the keratometric values of the posterior corneal surface (p<0.05) except J0 (p=0.410). Both devices showed strong positive correlations in Ks, Kf, Kastig (r>0.81, p<0.001) with wide ranges of a 95% limit of agreement (LoA). Vectoral components were significantly correlated (r>0.78, p<0.001) with narrow 95% LoA, except J45 of the posterior surface (r=0.39, p=0.004). In the corneal HOAs, there were statistically significant differences in the vertical coma, horizontal trefoil, spherical aberration, and root mean square (RMS) of each fifth-and sixth-order Zernike coefficient (p=0.043, 0.041, p<0.001, p<0.001, and p<0.001, respectively). Other HOAs showed moderate to strong positive correlations (r>0.37, p<0.05). Most HOAs, except for the horizontal trefoil, showed clinically acceptable agreements. The total RMS of HOAs was not significantly different between the two devices (p=0.122). Conclusion:Most of the keratometric values cannot be used interchangeably. However, the vectoral component of astigmatism showed clinically good agreement. Several HOAs have statistically significant differences; however, almost all HOAs showed acceptable agreements, except for the horizontal trefoil.

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Section: Discussionmentioning

confidence: 99%

Agreement between Scheimpflug Camera and the Swept-source Optical Coherence Tomography Measurements in Keratometry and Higher-order Aberrations

Gim

Jun

Han

2021

Korean J Ophthalmol

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“…22 Further, in subjects with normal vision, contrast sensitivity was observed to increase when HOA were corrected with adaptive optics, suggesting that this correction may improve spatial vision particularly for larger pupils. 3 In our study, we were able to detect with sufficient statistical power differences of up to 0.1 μm in measurements of RMS HOA. Hence, as long as this value falls within the normal range, we propose that both devices (Anterion and Pentacam HR) could be used interchangeably, especially for the 4 mm optic zone.…”

Section: Discussionmentioning

confidence: 50%

“…Bland-Altman plots were also constructed with SPSS using the LoAs to compare both devices. 19 Sample size calculation was based on recent studies that have analyzed agreement between AS-OCT and Scheimpflug devices, 3,20 and Pentacam corneal aberration measurements. 21 Based on this papers, it was calculated first for three corneal aberration values (RMS HOA: 0.15; Standard deviation (SD): 0.09; Z4_Spherical aberration: 0.1, SD: 0.05; RMS LOA: 0.8; SD: 0.4).…”

Section: Discussionmentioning

confidence: 99%

“…3,21 Piccinni et al recently reported significant differences in total corneal HOA measured by Scheimpflug versus dual Scheimpflug-Placido technology. 3 In this latter study, HOA mean differences were comparable to our results in that there was overall reasonable agreement in all measures. The authors concluded that HOA measurements made using both their devices could be considered equivalent in a clinical setting, but not for research purposes.…”

Section: Discussionmentioning

confidence: 99%

“…1,2 Lower order aberrations (LOA) can be easily treated with refraction, but higher order aberrations (HOA) can significantly impact eyes with irregular optical systems despite proper refractive correction. 1 While HOA are especially common in abnormal corneas, such as in eyes with keratoconus or undergoing scaring or penetrating corneal transplantation, 3,4 they can also be detected in seemingly normal corneas. 1 This determines that before considering any refractive procedure, systematic HOA assessment is essential.…”

Section: Introductionmentioning

confidence: 99%

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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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Corneal Topography and Tomography

Aramberri

2024

Intraocular Lens Calculations

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Corneal topography measures the shape and optical properties of the cornea with different technologies that have evolved through the years: from Placido reflection topographers to elevation Scheimpflug and OCT tomographers. In this chapter, the difference among these instruments is analyzed exposing the features of each method as well as the precision and agreement of the measurements. Definitions and metrics used for shape, curvature, elevation, optical power, and aberrometry are discussed. These instruments provide the surgeon with software-oriented to intraocular lens (IOL) power calculation taking advantage of the anterior and posterior corneal measurements. Corneal analysis also plays an important role in the selection of the most adequate IOL optical design.

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

Cited by 14 publications

References 28 publications

Agreement between Scheimpflug Camera and the Swept-source Optical Coherence Tomography Measurements in Keratometry and Higher-order Aberrations

Agreement between Scheimpflug Camera and the Swept-source Optical Coherence Tomography Measurements in Keratometry and Higher-order Aberrations

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

Corneal Topography and Tomography

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