Pentacam Scheimpflug Tomography Findings in Topographically Normal Patients and Subclinical Keratoconus Cases

Vazquez, Pablo Raul Ruisenor; Galletti, Jonatán David; Mínguez, Natalia Ximena; Delrivo, Marianella; Bonthoux, Fernando Fuentes; Pförtner, Timo-Kolja; Galletti, Jeremías Gastón

doi:10.1016/j.ajo.2014.03.018

Cited by 120 publications

(80 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This interest has opened the field for various studies, that enriched literature with data regarding the accuracy of various ectasia detection indices [20, 21, 22]. Many studies detected a higher accuracy for tomographic (elevation- and pachymetry-based) rather than topographic (curvature-based) indices in ectasia diagnosis [22, 23].…”

Section: Discussionmentioning

confidence: 99%

Pentacam HR Indices Variation in Normal Corneas with Different Corneal Thickness

Roshdy

Wahba

Elkitkat

et al. 2018

Journal of Ophthalmology

View full text Add to dashboard Cite

Purpose To evaluate the effect of variable corneal thickness on Pentacam HR diagnostic indices in normal corneas. Methods Retrospective study was conducted at Al Watany Eye Hospital, Cairo, Egypt. Consecutive 160 eyes of young myopic subjects without KC were evaluated using Pentacam HR (WaveLight Allegro Oculyzer II, Erlangen, Germany). The elevation- and thickness-based indices were recorded. Enrolled corneas were categorized into three groups according to TCT quartiles; group 1 (39 eyes) included corneas with TCT <523 µm, group 2 (81 eyes) with TCT between 523 and 564 µm, while group 3 (40 eyes) enrolled TCT >564 µm. The possible effect of pachymetry on Pentacam HR indices was assessed using partial correlation tests. Results In normal corneas, back elevation from best fit sphere (BE from BFS) and that from best fit toric ellipsoid (BFTE) were the elevation indices that showed statistically significant differences among groups (P=0.013 and 0.019, respectively). Regarding pachymetric indices, maximum pachymetry progression index (PPI max) showed statistical significance (P=0.001). Partial correlations, after excluding age and refractive error effects, showed that TCT was correlated with BE from BFS, BE from BFTE, and PPI max (P=0.001, 0.001,0.002, respectively). Conclusions Some Pentacam HR indices varied with different corneal thickness in normal corneas. This necessitates inclusion of pachymetric subgroups in the normative database. The use of the more robust indices (average pachymetry progression index and front elevations) is recommended in relatively thin or thick corneas.

show abstract

Section: Discussionmentioning

confidence: 99%

Pentacam HR Indices Variation in Normal Corneas with Different Corneal Thickness

Roshdy

Wahba

Elkitkat

et al. 2018

Journal of Ophthalmology

View full text Add to dashboard Cite

show abstract

“…Various indices derived from Pentacam are able to discriminate normal and keratoconus corneas 15–17. Ruiseñor Vázquez et al showed that average ART, maximum pachymetric progression indices, deviation of relational thickness and final D value of BAD had AUC ≥0.95 in diagnosing keratoconus and AUC ≥0.92 in detecting subclinical disease 15. Muftuoglu et al demonstrated that the final D value of BAD had 100% sensitivity and 100% specificity in differentiating keratoconus eyes from normal eyes using a cut-off of 2.1 17.…”

Section: Discussionmentioning

confidence: 99%

Comparison of corneal dynamic parameters and tomographic measurements using Scheimpflug imaging in keratoconus

Chan

Wang

et al. 2017

Br J Ophthalmol

View full text Add to dashboard Cite

show abstract

“…The results also reflected a relative difference between children's values and the values in subclinical and keratoconus patients found by Ambrósio et al [9], that studied 113 normal and 44 eyes with keratoconus from brazillian patients aged between 11.7 to 78 years (mean 38.7 ± 17.9 years), and Vazquez et al [30], that studied 189 normal and 44 eyes with keratoconus and their fellow eyes from argentine patients aged between 14 and 71 years (mean 32.3 ± 8.1 years), as seen in Table 2. It seems that children's corneas become thinner from the periphery to the center the same way and as fast as adult corneas do, a finding that suggests that this parameter could be used to identify pediatric corneas that differ from healthy parameters.…”

Section: Discussionmentioning

confidence: 65%

Corneal Evaluation in Healthy Brazilian Children Using a Scheimpflug Topography System

Is¹,

Mf²,

Camila³

et al. 2017

J Clin Exp Ophthalmol

View full text Add to dashboard Cite

Purpose: To identify the distribution and variation in corneal topography, thickness, and elevation in healthy Brazilian children as measured by the Pentacam Scheimpflug system (Oculus Optikgeräte GmbH, Wetzlar, Germany). Methods:Healthy children between 7 and 11 years of age were scanned using the Pentacam Scheimpflug corneal topography system (Oculus Optikgeräte GmbH, Wetzlar, Germany). The exclusion criteria were inability to undergo the ocular exam, history of any ocular diseases (including strabismus, amblyopia, cataracts, retinal disorders, and allergic conjunctivitis), and topographic diagnosis of corneal ectasia based on the modified Rabinowitz/McDonnell criteria for keratoconus. The right eye of each subject was selected for analysis. The parameters evaluated were central corneal thickness (CCT), thinnest pachymetry (TP), average pachymetric progression index (PPIave), anterior and posterior elevation (AE and PE), anterior and posterior best fit sphere (ABFS and PBFS), pachymetric difference between the apex and the thinnest point (PDAT), Ambrosio's relational thickness (ARTMax), overall Belin/Ambrósio Enhanced Ectasia display score (BAD-D), simulated keratometry (SimK), astigmatism in SimK (SimK astig), maximum keratometry (K max), asphericity (Q value), and anterior chamber depth (ACD).Results: A total of 160 children (69 male, 91 female) were included in this study. The mean age of the children was 8.82 ± 1.23 years (ranging from 7 to 11 years). The mean CCT was 553.81 ± 32 µm, and mean TP was 547.95 ± 32.06 µm. The TP was most commonly located in the inferotemporal quadrant in 93.125% (149) eyes. The mean PPIave was 1.00 ± 0.14, similar to that of normal adults. The mean ABFS and PBFS values were 7.49 ± 3.26 and 10.54 ± 6.25, respectively. ART Max and D averaged 446.57 ± 81.20 and 0.78 ± 0.65, respectively. Mean ± SD values for SimK, SimK astig, and K max were 43.35 ± 1.31 D, 0.92 ± 0.66 D, and 44.40 ± 1.45 D respectively. The K max and SimK astig values were close to those reported by other topographic systems for children. Q value and ACD averaged -0.39 ± 0.12 and 3.065 ± 0.2745 mm. Conclusion:This study provides normative values for corneal topography, thickness, and elevation in healthy Brazilian children. These results may provide helpful information for diagnosis of corneal diseases in children. Further studies are needed to evaluate the role of tomography in identifying early forms of ectasia in this age group.

show abstract

Pentacam Scheimpflug Tomography Findings in Topographically Normal Patients and Subclinical Keratoconus Cases

Cited by 120 publications

References 21 publications

Pentacam HR Indices Variation in Normal Corneas with Different Corneal Thickness

Pentacam HR Indices Variation in Normal Corneas with Different Corneal Thickness

Comparison of corneal dynamic parameters and tomographic measurements using Scheimpflug imaging in keratoconus

Corneal Evaluation in Healthy Brazilian Children Using a Scheimpflug Topography System

Contact Info

Product

Resources

About