Agreement and repeatability of corneal tomography in healthy eyes using a new swept-source OCT, a rotating Scheimpflug camera, and a dual Scheimpflug–Placido system

Herber, Robert; Lenk, Janine; Pillunat, Lutz E; Raiskup, Frederik

doi:10.1097/j.jcrs.0000000000000734

Cited by 11 publications

(5 citation statements)

References 30 publications

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“…The mean ACV value was slightly larger in previous studies, which could be due to demographic, ethnic, age, or measurement tool differences. According to previous studies, the accuracy of the swept-source tools is higher than the Pentacam [38][39] . On the other hand, all of the participants were phakic in the present study and subjects with a history of cataract surgery were excluded.…”

Section: Resultsmentioning

confidence: 90%

Axial length and anterior chamber indices in elderly population: Tehran Geriatric Eye Study

Hashemi,

Khabazkhoob

2023

Int J Ophthalmol

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AIM: To determine the normative distribution of axial length (AL), anterior chamber depth (ACD), anterior chamber volume (ACV), anterior chamber angle (ACA), and some of their associated factors in subjects aged 60 and over. METHODS: In this cross-sectional study, 160 clusters were sampled using multi-stage cluster sampling in Tehran, Iran. After a preliminary interview, the participants underwent optometric examinations including visual acuity and refraction measurement followed by slit lamp biomicroscopy. Finally, ocular imaging was done using the Pentacam AXL to measure AL, ACD, ACV, and ACA. RESULTS: A total of 4519 eyes of 2436 participants were evaluated, of whom 58.0% (n=1412) were female. The mean age of the subjects was 67.32±6.05y (range: 60-95y). The mean AL, ACD, ACV, and ACA was 23.22 mm (23.18-23.27 mm), 2.61 mm (2.59-2.62 mm), 126.56 mm3 (125.08-128.04 mm3), and 30.61° (30.3°-30.92°), respectively. In the multivariable model, after adjusting for the effect of both eyes, the longest and shortest AL was seen in myopic and hyperopic subjects, respectively. AL, ACD, ACV and ACA were significantly larger in men compared to women (P<0.001). Except ACA, other evaluated parameters showed an inverse correlation with age (P<0.001), however, this correlation was insignificant for AL (P=0.623). CONCLUSION: Normative value of AL, and other biometric parameters are specific for each ethnicity, age and sex group. Any alteration in these parameters and their effect on refraction should be considered in this age group, especially in case of cataract surgery.

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Section: Resultsmentioning

confidence: 90%

Axial length and anterior chamber indices in elderly population: Tehran Geriatric Eye Study

Hashemi,

Khabazkhoob

2023

Int J Ophthalmol

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“…Previous studies have shown that in healthy eyes, the repeatability of corneal tomography obtained with Scheimpflug, scanning-slit and OCT devices is excellent with an intraclass correlation coefficient greater than 0.9. 5,20,21 Feldman et al 22 have shown that the OCT corneal topographer Casia SS-1000 has greater repeatability and reproducibility compared with Pentacam measurements for corneal curvature and pachymetry maps. It is also known that the repeatability of corneal tomography measurements is significantly reduced in patients with advanced keratoconus and corneas thinner than 400 μm when compared with individuals with corneas thicker than 450 μm.…”

Section: Discussionmentioning

confidence: 99%

Corneal Tomography in a Commercially Available Optical Coherence Tomography Device and Comparison With a Rotating Scheimpflug Camera

Kanclerz,

Radomski

2024

Eye &Amp; Contact Lens: Science &Amp; Clinical Practice

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Objective: To compare the outcomes of corneal tomography obtained with an anterior-to-posterior segment optical coherence tomography device (Revo, Optopol Technologies Sp. z o.o.) and a rotating Scheimpflug camera (Pentacam AXL, Oculus Optikgeräte, Wetzlar, Germany). Methods: In healthy subjects, agreement in stereometric parameters commonly used in cataract and refractive surgery was assessed. Comparison between the devices was performed using correlation coefficients, the Bland–Altman method, and a paired t test. Results: Results of right eyes of 78 patients (47 women) aged 25.24±5.56 years were analyzed. The flat and steep anterior keratometry values were significantly higher for Revo than Pentacam (43.65±1.58 D vs. 42.99±1.47 D; P = 0.000, and 44.53±1.57 D vs. 43.82±1.49 D; P=0.000, respectively) and showed excellent correlation (r=0.978 and 0.974, respectively). The results for maximal keratometry manifested a higher difference (45.89±1.69 D vs. 44.27±1.51 D for Revo and Pentacam, P=0.000) but were also strongly correlated (r=0.871). Revo showed significantly lower corneal thickness values than Pentacam, both for apex pachymetry (535.54±32.45 vs. 550.74±31.55 μm; P=0.000) and for thinnest pachymetry (522.58±32.16 vs. 547.25±31.95 μm; P=0.000). The correlation coefficients for anterior and posterior corneal elevation at the thinnest point showed weak positive correlation (r=0.179 and 0.185), while the correlation for corneal asphericity was moderate (r=0.317). Conclusions: There was a significant difference between keratometric values obtained with Revo and the Pentacam AXL, although the measurements showed excellent correlation. Similar results were found for corneal thickness measurements, but not for corneal surface elevation and corneal asphericity.

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“…More recently, Schiano-Lomoriello et al have shown that most biometric parameters between Placido + SD-OCT (MS-39) and SS-OCT (ANTERION) can be considered to be clinically interchangeable [ 16 ]. Herber et al, however, found the LoAs of most corneal parameters between Scheimpflug imaging (Pentacam HR), dual Placido-combined Scheimpflug imaging (Galilei G6, Ziemer Ophthalmic Systems), and SS-OCT (ANTERION) to be too broad to be eligible for clinical interchangeability [ 17 ]. We therefore evaluated the agreement and interchangeability of wavefront aberrations at the refracting components of the cornea between the SS-OCT platform and the referential Placido + SD-OCT device.…”

Section: Discussionmentioning

confidence: 99%

Comparison of corneal aberrations from anterior segment swept source OCT versus Placido-topography combined spectral domain OCT in cataract patients

Georgiev,

Ruiss,

Dana-Fisus

et al. 2023

Eye and Vis

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Background To comprehensively evaluate the agreement of component corneal aberrations from the newly updated wavefront analysis software of a swept-source optical coherence tomographer (SS-OCT) and a referential Placido-topography combined OCT device in elderly cataract patients. Methods Retrospective study including 103 eyes from 103 elderly patients scheduled for cataract surgery that were measured on the same day with a SS-OCT (Heidelberg Engineering, Germany) device and a Placido-topography combined OCT device (CSO, Italy). Anterior, total, and posterior corneal wavefront aberrations were evaluated for their mean differences and limits of agreement (LoA) via Bland-Altman plots. Vector analysis was additionally employed to compare corneal astigmatism measurements in dioptric vector space. Results Mean differences of all corneal aberrometric parameters did not exceed 0.05 μm. Total corneal aberrations were not significantly different from 0 except for vertical coma (− 0.04 μm; P = 0.003), spherical aberration (− 0.01 μm, P < 0.001), and root mean square (RMS) higher-order aberration (HOA) (0.03 μm, P = 0.04). The 95% LoA for total corneal aberration parameters between both devices were − 0.46 to 0.42 μm for horizontal astigmatism, − 0.37 to 0.41 μm for oblique astigmatism, − 0.19 to 0.17 μm for oblique trefoil, − 0.33 to 0.25 μm for vertical coma, − 0.20 to 0.22 μm for horizontal coma, − 0.22 to 0.20 μm for horizontal trefoil, − 0.11 to 0.08 μm for spherical aberration, and − 0.22 to 0.28 μm for RMS HOA. Vector analysis revealed no statistically significant mean differences for anterior, total, and posterior corneal astigmatism in dioptric vector space. Conclusion In eyes undergoing cataract surgery with a regular elderly cornea, corneal wavefront analysis from the SS-OCT device showed functional equivalency to the reference device. Nevertheless, clinically relevant higher order aberration parameters should be interpreted with caution for surgical decision-making.

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Agreement and repeatability of corneal tomography in healthy eyes using a new swept-source OCT, a rotating Scheimpflug camera, and a dual Scheimpflug–Placido system

Abstract: To investigate the accordance and repeatability of tomographic parameters measured by a new swept-source optical coherence tomographer (SS-OCT, ANTERION), a rotating Scheimpflug camera (RSC, Pentacam), and a dual Scheimpflug-Placido system (DSP, Galilei G6).

Cited by 11 publications

References 30 publications

Axial length and anterior chamber indices in elderly population: Tehran Geriatric Eye Study

Axial length and anterior chamber indices in elderly population: Tehran Geriatric Eye Study

Corneal Tomography in a Commercially Available Optical Coherence Tomography Device and Comparison With a Rotating Scheimpflug Camera

Comparison of corneal aberrations from anterior segment swept source OCT versus Placido-topography combined spectral domain OCT in cataract patients

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