An Ultra-High-Speed Scheimpflug Camera for Evaluation of Corneal Deformation Response and Its Impact on IOP Measurement

2013 ◽  
Vol 54 (4) ◽  
pp. 2885 ◽  
Author(s):  
Christopher Kai-Shun Leung ◽  
Cong Ye ◽  
Robert N. Weinreb
Keyword(s):  
High Speed ◽  
Deformation Response ◽  
Scheimpflug Camera ◽  
Ultra High Speed ◽  
Corneal Deformation ◽  
Iop Measurement

Repeatability of Corneal Deformation Response Parameters by Dynamic Ultra High-speed Scheimpflug Imaging in Normal and Keratoconus Eyes

2021 ◽  
Vol 48 (1) ◽  
pp. 14-19
Author(s):  
Maria A. Henriquez ◽  
Isabel Gomez ◽  
Maythe Camino-Quezada ◽  
Luis Izquierdo ◽  
José Chauca ◽  
...  
Keyword(s):  
High Speed ◽  
Deformation Response ◽  
Ultra High Speed ◽  
Corneal Deformation ◽  
Scheimpflug Imaging

Comparison of Corneal Deformation Parameters in Keratoconic and Normal Eyes Using a Non-contact Tonometer With a Dynamic Ultra-High-Speed Scheimpflug Camera

2017 ◽  
Vol 33 (9) ◽  
pp. 625-631 ◽  
Author(s):  
Ryan N. Mercer ◽  
George O. Waring ◽  
Cynthia J. Roberts ◽  
Vishal Jhanji ◽  
Yumeng Wang ◽  
...  
Keyword(s):  
High Speed ◽  
Scheimpflug Camera ◽  
Deformation Parameters ◽  
Ultra High Speed ◽  
Corneal Deformation

scholarly journals Effects of age on corneal deformation by non-contact tonometry integrated with an ultra-high-speed (UHS) Scheimpflug camera

2013 ◽  
Vol 76 (4) ◽  
pp. 229-232 ◽  
Author(s):  
Bruno Freitas Valbon ◽  
Renato Ambrósio-Jr. ◽  
Bruno Machado Fontes ◽  
Milton Ruiz Alves
Keyword(s):  
High Speed ◽  
Scheimpflug Camera ◽  
Ultra High Speed ◽  
Corneal Deformation

scholarly journals Corneal Deformation Response with Dynamic Ultra-high-speed Scheimpflug Imaging for Detecting Ectatic Corneas

2016 ◽  
Vol 5 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Isaac Ramos ◽  
Marcella Q Salomão ◽  
Fernando F Correia
Keyword(s):  
High Speed ◽  
Linear Regression Analysis ◽  
Response Analysis ◽  
Scheimpflug Photography ◽  
Deformation Response ◽  
Ultra High Speed ◽  
Corneal Deformation ◽  
Scheimpflug Imaging ◽  
Post Hoc ◽  
Corneal Tomography

ABSTRACT Purpose To test the ability of metrics derived from corneal response to noncontact tonometry (NCT) to distinguish between normal and ectatic cases. Materials and methods The prototype of CorVis ST (Oculus, Wetzlar, Germany) was used for assessing corneal biomechanical response using ultra-high-speed 8 mm horizontal Scheimpflug photography, taking 4,330 frames per second during NCT. Patients were stratified based on clinical data, including rotating Scheimpflug corneal tomography (Oculus Pentacam HR). Biomechanical data from one eye randomly selected of 177 patients with normal corneas (N) and from 79 patients with bilateral keratoconus (KC) were investigated. Group forme fruste keratoconus (FFKC) was composed of 20 eyes with normal topographic patterns from cases with ectasia detected in the fellow eye. Group keratoconus suspect (KCS) had 16 eyes from 16 patients with topographic patterns suspicious of KC but documented stability over 3 years and normal tomographic findings. A combination of deformation parameters using linear regression analysis (Prototype Factor 1, pF1) was created by the BrAIn (Brazilian Artificial Intelligence on Corneal Tomography and Biomechanics) study group in order to provide the best possible separation of KC and normals. Results Statistical significant differences were found for N × KC for several parameters, including first and second applanation times, deformation amplitude, and maximal concavity radius (Mann–Whitney, p < 0.001). However, the areas under the receiver operating characteristic curves (AUC) were lower than 0.90. The pF1 had AUC of 0.945 (IC 0.909–0.97; sensitivity = 87.3% and specificity = 89.3%). The pF1 had statistically significant differences between the ectatic (KC and FFKC) and nonectatic groups (N and KCS) (p < 0.05, Kruskall–Wallis Test with post hoc Dunn's test). Conclusion Corneal deformation response analysis by ultra- high-speed 8 mm horizontal Scheimpflug photography provides relevant data for distinguishing ectatic and nonectatic corneas but cannot be used independently to detect KC. This data may be integrated with corneal tomography data for enhancing sensitivity and specificity for screening ectasia. How to cite this article Salomão MQ, Correia FF, Ramos I, Luz A, Ambrósio R Jr. Corneal Deformation Response with Dynamic Ultra-high-speed Scheimpflug Imaging for Detecting Ectatic Corneas. Int J Kerat Ect Cor Dis 2016;5(1):1-5.

scholarly journals Impact of chamber pressure and material properties on the deformation response of corneal models measured by dynamic ultra-high-speed Scheimpflug imaging

2013 ◽  
Vol 76 (5) ◽  
pp. 278-281 ◽  
Author(s):  
Fernando Faria Correia ◽  
Isaac Ramos ◽  
Cynthia J. Roberts ◽  
Andreas Steinmueller ◽  
Matthias Krug ◽  
...  
Keyword(s):  
Material Properties ◽  
High Speed ◽  
Chamber Pressure ◽  
Deformation Response ◽  
Ultra High Speed ◽  
Scheimpflug Imaging

scholarly journals First Clinical Impressions on the Integrated Corneal Tomography and Corneal Deformation with Scheimpflug Imaging

2017 ◽  
Vol 6 (2) ◽  
pp. 101-109
Author(s):  
Jorge S Haddad ◽  
Eliza Barnwell ◽  
Karolinne M Rocha ◽  
George O Waring IV ◽  
Renato Ambrosio Jr
Keyword(s):  
Clinical Data ◽  
High Speed ◽  
Imaging System ◽  
Corneal Ectasia ◽  
Scheimpflug Camera ◽  
Deformation Parameters ◽  
Corneal Deformation ◽  
Scheimpflug Imaging ◽  
Noncontact Tonometer ◽  
Corneal Tomography

ABSTRACT The purpose of this study is to report the preliminary findings and the retrospective clinical impressions of the integrated corneal tomography and corneal deformation parameters with a dynamic ultra-high-speed Scheimpflug camera equipped with a noncontact tonometer. Twelve eyes of six patients were evaluated by the Scheimpflug imaging system of the Pentacam HR and Corvis ST (OCULUS Optikgeräte GmbH, Wetzlar, Germany) devices. The parameters used were the Belin/Ambrósio deviation (BAD-D) and Corvis biomechanical index (CBI), as well as the recently published tomographic and biomechanical index (TBI), combined with a detailed clinical data and evaluation of normal eyes and patients with different stages of corneal ectasia. How to cite this article Haddad JS, Barnwell E, Rocha KM, Waring IV GO, Ambrosio Jr R. First Clinical Impressions on the Integrated Corneal Tomography and Corneal Deformation with Scheimpflug Imaging. Int J Kerat Ect Cor Dis 2017;6(2):101-109.

Recent Advances in Ultra-High-Speed Waveguide Photodiodes for Optical Communication Systems

2009 ◽  
Vol E92-C (7) ◽  
pp. 922-928 ◽  
Author(s):  
Kikuo MAKITA ◽  
Kazuhiro SHIBA ◽  
Takeshi NAKATA ◽  
Emiko MIZUKI ◽  
Sawaki WATANABE
Keyword(s):  
Optical Communication ◽  
Communication Systems ◽  
High Speed ◽  
Recent Advances ◽  
Ultra High Speed ◽  
Optical Communication Systems

Interior Winding Synchronous Motor for Reducing Iron Loss at Ultra-High-Speed

2020 ◽  
Author(s):  
Ryoken Masuda ◽  
Manabu Horiuchi ◽  
Mitsuhide Sato ◽  
Yinggang Bu ◽  
Masami Nirei ◽  
...  
Keyword(s):  
High Speed ◽  
Synchronous Motor ◽  
Iron Loss ◽  
Ultra High Speed
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