Scheimpflug vs Scanning-Slit Corneal Tomography: Comparison of Corneal and Anterior Chamber Tomography Indices for Repeatability and Agreement in Healthy Eyes
Anastasios John Kanellopoulos1,2 1Department of Ophthalmology, The LaserVision Clinical and Research Eye Institute, Athens, Attiki, Greece; 2Department of Ophthalmology, New York University Medical School, New York City, NY, USACorrespondence: Anastasios John KanellopoulosThe LaserVision Clinical an...
| Main Author: | |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Dove Medical Press
2020-09-01
|
| Series: | Clinical Ophthalmology |
| Subjects: | |
| Online Access: | https://www.dovepress.com/scheimpflug-vs-scanning-slit-corneal-tomography-comparison-of-corneal--peer-reviewed-article-OPTH |
| _version_ | 1818431571608207360 |
|---|---|
| author | Kanellopoulos AJ |
| author_facet | Kanellopoulos AJ |
| author_sort | Kanellopoulos AJ |
| collection | DOAJ |
| description | Anastasios John Kanellopoulos1,2 1Department of Ophthalmology, The LaserVision Clinical and Research Eye Institute, Athens, Attiki, Greece; 2Department of Ophthalmology, New York University Medical School, New York City, NY, USACorrespondence: Anastasios John KanellopoulosThe LaserVision Clinical and Research Eye Institute, Athens, GreeceTel + 30 210 7472777Fax + 30 210 7472789Email ajkmd@mac.comPurpose: To evaluate and compare the repeatability and agreement of Scheimpflug vs scanning-slit tomography of the cornea and the anterior chamber in terms of keratometric and tomographic indices in healthy eyes.Methods: The 20 eyes of 10 healthy participants underwent 3 consecutive measurements using both Scheimpflug-tomography and scanning-slit tomography, diagnostic devices. Multiple corneal and anterior chamber tomographic parameters were recorded and evaluated to include corneal keratometry and its axis; corneal best-fit sphere (BFS), pachymetry mapping, angle kappa, anterior chamber depth (ACD), pupil diameter, and location. Repeatability for each device was assessed using the within each subject standard deviation of sequential exams, the coefficient variation (CV) and the intraclass correlation coefficient (ICC). Agreement between the two devices was assessed using Bland–Altman plots with 95% limits of agreement (LoA) and correlation coefficient (r).Results: Both devices were found to have high repeatability (ICC> 0.9) both in keratometric and other tomographic measurements. Scheimpflug tomography’s repeatability though appeared superior in the average keratometry values, anterior and posterior BFS, thinnest corneal pachymetry value and location (p< 0.05). Agreement: Statistically significant inter-device differences were noted in the mean values of K1, K2, BFS, ACD and thinnest corneal pachymetry (p< 0.05). Despite the agreement differences noted, the two devices were well correlated (r> 0.8) in respective measurements with Scheimpflug delivering consistently lower values than the scanning-slit tomography device.Conclusion: Scheimpflug-tomography repeatability was found to be superior to that of scanning-slit tomography in this specific study, in most parameters evaluated. Inter-device agreement evaluation suggests that reading from the two devices may not be used interchangeably in absolute values, yet they are well correlated with Scheimpflug delivering consistently lower values in most.Keywords: Pentacam, Orbscan, Scheimpflug corneal tomography, scanning-slit corneal tomography |
| first_indexed | 2024-12-14T15:51:25Z |
| format | Article |
| id | doaj.art-9463ef3942494fecae836fcebd38fa30 |
| institution | Directory Open Access Journal |
| issn | 1177-5483 |
| language | English |
| last_indexed | 2024-12-14T15:51:25Z |
| publishDate | 2020-09-01 |
| publisher | Dove Medical Press |
| record_format | Article |
| series | Clinical Ophthalmology |
| spelling | doaj.art-9463ef3942494fecae836fcebd38fa302022-12-21T22:55:23ZengDove Medical PressClinical Ophthalmology1177-54832020-09-01Volume 142583259256774Scheimpflug vs Scanning-Slit Corneal Tomography: Comparison of Corneal and Anterior Chamber Tomography Indices for Repeatability and Agreement in Healthy EyesKanellopoulos AJAnastasios John Kanellopoulos1,2 1Department of Ophthalmology, The LaserVision Clinical and Research Eye Institute, Athens, Attiki, Greece; 2Department of Ophthalmology, New York University Medical School, New York City, NY, USACorrespondence: Anastasios John KanellopoulosThe LaserVision Clinical and Research Eye Institute, Athens, GreeceTel + 30 210 7472777Fax + 30 210 7472789Email ajkmd@mac.comPurpose: To evaluate and compare the repeatability and agreement of Scheimpflug vs scanning-slit tomography of the cornea and the anterior chamber in terms of keratometric and tomographic indices in healthy eyes.Methods: The 20 eyes of 10 healthy participants underwent 3 consecutive measurements using both Scheimpflug-tomography and scanning-slit tomography, diagnostic devices. Multiple corneal and anterior chamber tomographic parameters were recorded and evaluated to include corneal keratometry and its axis; corneal best-fit sphere (BFS), pachymetry mapping, angle kappa, anterior chamber depth (ACD), pupil diameter, and location. Repeatability for each device was assessed using the within each subject standard deviation of sequential exams, the coefficient variation (CV) and the intraclass correlation coefficient (ICC). Agreement between the two devices was assessed using Bland–Altman plots with 95% limits of agreement (LoA) and correlation coefficient (r).Results: Both devices were found to have high repeatability (ICC> 0.9) both in keratometric and other tomographic measurements. Scheimpflug tomography’s repeatability though appeared superior in the average keratometry values, anterior and posterior BFS, thinnest corneal pachymetry value and location (p< 0.05). Agreement: Statistically significant inter-device differences were noted in the mean values of K1, K2, BFS, ACD and thinnest corneal pachymetry (p< 0.05). Despite the agreement differences noted, the two devices were well correlated (r> 0.8) in respective measurements with Scheimpflug delivering consistently lower values than the scanning-slit tomography device.Conclusion: Scheimpflug-tomography repeatability was found to be superior to that of scanning-slit tomography in this specific study, in most parameters evaluated. Inter-device agreement evaluation suggests that reading from the two devices may not be used interchangeably in absolute values, yet they are well correlated with Scheimpflug delivering consistently lower values in most.Keywords: Pentacam, Orbscan, Scheimpflug corneal tomography, scanning-slit corneal tomographyhttps://www.dovepress.com/scheimpflug-vs-scanning-slit-corneal-tomography-comparison-of-corneal--peer-reviewed-article-OPTHpentacamorbscanscheimpflug corneal tomographyscanning-slit corneal tomog-raphy |
| spellingShingle | Kanellopoulos AJ Scheimpflug vs Scanning-Slit Corneal Tomography: Comparison of Corneal and Anterior Chamber Tomography Indices for Repeatability and Agreement in Healthy Eyes Clinical Ophthalmology pentacam orbscan scheimpflug corneal tomography scanning-slit corneal tomog-raphy |
| title | Scheimpflug vs Scanning-Slit Corneal Tomography: Comparison of Corneal and Anterior Chamber Tomography Indices for Repeatability and Agreement in Healthy Eyes |
| title_full | Scheimpflug vs Scanning-Slit Corneal Tomography: Comparison of Corneal and Anterior Chamber Tomography Indices for Repeatability and Agreement in Healthy Eyes |
| title_fullStr | Scheimpflug vs Scanning-Slit Corneal Tomography: Comparison of Corneal and Anterior Chamber Tomography Indices for Repeatability and Agreement in Healthy Eyes |
| title_full_unstemmed | Scheimpflug vs Scanning-Slit Corneal Tomography: Comparison of Corneal and Anterior Chamber Tomography Indices for Repeatability and Agreement in Healthy Eyes |
| title_short | Scheimpflug vs Scanning-Slit Corneal Tomography: Comparison of Corneal and Anterior Chamber Tomography Indices for Repeatability and Agreement in Healthy Eyes |
| title_sort | scheimpflug vs scanning slit corneal tomography comparison of corneal and anterior chamber tomography indices for repeatability and agreement in healthy eyes |
| topic | pentacam orbscan scheimpflug corneal tomography scanning-slit corneal tomog-raphy |
| url | https://www.dovepress.com/scheimpflug-vs-scanning-slit-corneal-tomography-comparison-of-corneal--peer-reviewed-article-OPTH |
| work_keys_str_mv | AT kanellopoulosaj scheimpflugvsscanningslitcornealtomographycomparisonofcornealandanteriorchambertomographyindicesforrepeatabilityandagreementinhealthyeyes |