Relationship Among Corneal Stiffness, Thickness, and Biomechanical Parameters Measured by Corvis ST, Pentacam and ORA in Keratoconus
PurposeTo assess the relationship among corneal stiffness, thickness, and biomechanical parameters in keratoconus.SettingThe EENT Hospital of Fudan University, Shanghai, China.DesignComparative study.MethodsIn this cross-sectional prospective study, 75 keratoconic eyes of 44 patients were recruited....
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doaj-5d2309055ccb4d20bd8ffac070b0380a2020-11-25T01:58:51ZengFrontiers Media S.A.Frontiers in Physiology1664-042X2019-06-011010.3389/fphys.2019.00740436165Relationship Among Corneal Stiffness, Thickness, and Biomechanical Parameters Measured by Corvis ST, Pentacam and ORA in KeratoconusYu Zhao0Yu Zhao1Yang Shen2Yang Shen3Zhipeng Yan4Mi Tian5Mi Tian6Jing Zhao7Jing Zhao8Xingtao Zhou9Xingtao Zhou10Department of Ophthalmology and Optometry, Eye and ENT Hospital, Myopia Key Laboratory of the Health Ministry, Fudan University, Shanghai, ChinaShanghai Research Center of Ophthalmology and Optometry, Shanghai, ChinaDepartment of Ophthalmology and Optometry, Eye and ENT Hospital, Myopia Key Laboratory of the Health Ministry, Fudan University, Shanghai, ChinaShanghai Research Center of Ophthalmology and Optometry, Shanghai, ChinaDepartment of Ophthalmology, The Third Hospital of Hebei Medical University, Shijiazhuang, ChinaDepartment of Ophthalmology and Optometry, Eye and ENT Hospital, Myopia Key Laboratory of the Health Ministry, Fudan University, Shanghai, ChinaShanghai Research Center of Ophthalmology and Optometry, Shanghai, ChinaDepartment of Ophthalmology and Optometry, Eye and ENT Hospital, Myopia Key Laboratory of the Health Ministry, Fudan University, Shanghai, ChinaShanghai Research Center of Ophthalmology and Optometry, Shanghai, ChinaDepartment of Ophthalmology and Optometry, Eye and ENT Hospital, Myopia Key Laboratory of the Health Ministry, Fudan University, Shanghai, ChinaShanghai Research Center of Ophthalmology and Optometry, Shanghai, ChinaPurposeTo assess the relationship among corneal stiffness, thickness, and biomechanical parameters in keratoconus.SettingThe EENT Hospital of Fudan University, Shanghai, China.DesignComparative study.MethodsIn this cross-sectional prospective study, 75 keratoconic eyes of 44 patients were recruited. Eyes were divided three groups according to the steepest K-readings (Kmax): mild (31 eyes; 42.1–54.5D); moderate (27 eyes, 55.0–61.6D); and severe (17 eyes, 65.2–94.5D). Thirty-one healthy subjects were recruited as the control group. All patients underwent Corvis ST, Pentacam and ORA examinations at the same time. Stiffness parameter A1 (SP-A1) and other dynamic parameters were assessed using the Corvis ST. Kmax and thinnest corneal thickness (TCT) was obtained using the Pentacam. Corneal resistance factor (CRF) and corneal hysteresis (CH) were measured using the ORA. Analysis of correlation was applied to investigate the association between variables.ResultsThere was a decrease in SP-A1 in different stages of keratoconus compared with controls (P ≤ 0.001): with increasing severity, the value of SP-A1 became smaller (P < 0.05). A statistically significant linear relationship was noted between SP-A1 and TCT in each subgroup of keratoconus (P ≤ 0.001). In all three groups, SP-A1 was found to be positively correlated with first applanation time (P < 0.01), while negatively correlated with deformation amplitude (P < 0.05). Analysis of SP-A1 with regard to CRF and CH indicated statistically positive correlation in keratoconus (P < 0.05).ConclusionSignificant decreases in corneal stiffness were noted in kerotoconic eyes compared with normal eyes. The stiffness parameter could be a valuable clinical tool enables biomechanically track progression with keratoconus.SynopsisOur study found that corneal thinning and biomechanical decreasing synchronize with one another throughout the progression of the keratoconus, and SP-A1 could be a potential biomarker evaluating disease progression.https://www.frontiersin.org/article/10.3389/fphys.2019.00740/fullkerotoconuscorneal stiffnesscorneal biomechanicsCorvis STPentacam |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Yu Zhao Yu Zhao Yang Shen Yang Shen Zhipeng Yan Mi Tian Mi Tian Jing Zhao Jing Zhao Xingtao Zhou Xingtao Zhou |
spellingShingle |
Yu Zhao Yu Zhao Yang Shen Yang Shen Zhipeng Yan Mi Tian Mi Tian Jing Zhao Jing Zhao Xingtao Zhou Xingtao Zhou Relationship Among Corneal Stiffness, Thickness, and Biomechanical Parameters Measured by Corvis ST, Pentacam and ORA in Keratoconus Frontiers in Physiology kerotoconus corneal stiffness corneal biomechanics Corvis ST Pentacam |
author_facet |
Yu Zhao Yu Zhao Yang Shen Yang Shen Zhipeng Yan Mi Tian Mi Tian Jing Zhao Jing Zhao Xingtao Zhou Xingtao Zhou |
author_sort |
Yu Zhao |
title |
Relationship Among Corneal Stiffness, Thickness, and Biomechanical Parameters Measured by Corvis ST, Pentacam and ORA in Keratoconus |
title_short |
Relationship Among Corneal Stiffness, Thickness, and Biomechanical Parameters Measured by Corvis ST, Pentacam and ORA in Keratoconus |
title_full |
Relationship Among Corneal Stiffness, Thickness, and Biomechanical Parameters Measured by Corvis ST, Pentacam and ORA in Keratoconus |
title_fullStr |
Relationship Among Corneal Stiffness, Thickness, and Biomechanical Parameters Measured by Corvis ST, Pentacam and ORA in Keratoconus |
title_full_unstemmed |
Relationship Among Corneal Stiffness, Thickness, and Biomechanical Parameters Measured by Corvis ST, Pentacam and ORA in Keratoconus |
title_sort |
relationship among corneal stiffness, thickness, and biomechanical parameters measured by corvis st, pentacam and ora in keratoconus |
publisher |
Frontiers Media S.A. |
series |
Frontiers in Physiology |
issn |
1664-042X |
publishDate |
2019-06-01 |
description |
PurposeTo assess the relationship among corneal stiffness, thickness, and biomechanical parameters in keratoconus.SettingThe EENT Hospital of Fudan University, Shanghai, China.DesignComparative study.MethodsIn this cross-sectional prospective study, 75 keratoconic eyes of 44 patients were recruited. Eyes were divided three groups according to the steepest K-readings (Kmax): mild (31 eyes; 42.1–54.5D); moderate (27 eyes, 55.0–61.6D); and severe (17 eyes, 65.2–94.5D). Thirty-one healthy subjects were recruited as the control group. All patients underwent Corvis ST, Pentacam and ORA examinations at the same time. Stiffness parameter A1 (SP-A1) and other dynamic parameters were assessed using the Corvis ST. Kmax and thinnest corneal thickness (TCT) was obtained using the Pentacam. Corneal resistance factor (CRF) and corneal hysteresis (CH) were measured using the ORA. Analysis of correlation was applied to investigate the association between variables.ResultsThere was a decrease in SP-A1 in different stages of keratoconus compared with controls (P ≤ 0.001): with increasing severity, the value of SP-A1 became smaller (P < 0.05). A statistically significant linear relationship was noted between SP-A1 and TCT in each subgroup of keratoconus (P ≤ 0.001). In all three groups, SP-A1 was found to be positively correlated with first applanation time (P < 0.01), while negatively correlated with deformation amplitude (P < 0.05). Analysis of SP-A1 with regard to CRF and CH indicated statistically positive correlation in keratoconus (P < 0.05).ConclusionSignificant decreases in corneal stiffness were noted in kerotoconic eyes compared with normal eyes. The stiffness parameter could be a valuable clinical tool enables biomechanically track progression with keratoconus.SynopsisOur study found that corneal thinning and biomechanical decreasing synchronize with one another throughout the progression of the keratoconus, and SP-A1 could be a potential biomarker evaluating disease progression. |
topic |
kerotoconus corneal stiffness corneal biomechanics Corvis ST Pentacam |
url |
https://www.frontiersin.org/article/10.3389/fphys.2019.00740/full |
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