scholarly journals Automated stereo vision instrument tracking for intraoperative OCT guided anterior segment ophthalmic surgical maneuvers

2015 ◽  
Vol 6 (8) ◽  
pp. 3014 ◽  
Author(s):  
Mohamed T. El-Haddad ◽  
Yuankai K. Tao
Keyword(s):  
Stereo Vision ◽  
Anterior Segment ◽  
Instrument Tracking ◽  
Intraoperative Oct

scholarly journals Intraoperative Optical Coherence Tomography Analysis of Clear Corneal Incision: Effect of the Lateral Stromal Hydration

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Jiri Cendelin ◽  
Stepan Rusnak ◽  
Lenka Hecova
Keyword(s):  
Anterior Segment ◽  
Peripheral Part ◽  
Corneal Incision ◽  
Anterior Segment Oct ◽  
Clear Corneal Incision ◽  
Intraoperative Optical Coherence Tomography ◽  
Before And After ◽  
Tomography Analysis ◽  
Intraoperative Oct ◽  
Corneal Incisions

Aim of the Study. The aim of this prospective study was to analyse the effect of lateral stromal hydration on the morphology of clear corneal incision architecture using the microscope integrated anterior segment OCT. Methods. The cohort included 65 clear corneal incisions of 49 patients who underwent cataract surgery. Corneal incisions were recorded using a Leica Proveo 8 microscope with an intraoperative OCT EnFocus™ device continuously during the surgery. Corneal incision morphology before and after lateral stromal hydration was analysed. Results. Good adaptation of the corneal incision before hydration was present in 39 cases (60%), in 16 cases (24.6%), the prominence of posterior lip was present, and, in 10 cases (15.4%), the posterior lip tongue was inverted/retracted into the incision. In 38 cases (58.5%), hydration had no effect on the incision architecture; most often, it was primarily a well-adapted corneal incision (46.2%), less often an incision with posterior lip prominence (10.8%), or tongue inversion into the incision (1.6%) prior to hydration. Hydration worsened the incision architecture in 14 cases (21.5%); most often, it induced/worsened posterior lip prominence (15.4%), less often posterior lip retraction (1.6%), tongue inversion into the incision (1.6%), gap development in the peripheral part of the corneal incision (1.6%), or incomplete opening of the corneal incision (1.6%). In 13 cases (20%), hydration improved the incision architecture, especially in cases with inverted or retracted posterior lip tongue (12.3%), less often in cases with posterior lip prominence (7.7%). Conclusion. Lateral stromal hydration seldom affects the condition of the corneal incision. Still, it can cause both deterioration and improvement of the corneal incision architecture. Intraoperative OCT provides real-time monitoring of corneal incision morphology during hydration procedure.

scholarly journals Optical surgical instrument tracking system based on the principle of stereo vision

2017 ◽  
Vol 22 (6) ◽  
pp. 065005 ◽  
Author(s):  
Zhentian Zhou ◽  
Bo Wu ◽  
Juan Duan ◽  
Xu Zhang ◽  
Nan Zhang ◽  
...  
Keyword(s):  
Stereo Vision ◽  
Tracking System ◽  
Surgical Instrument ◽  
Instrument Tracking

Auswirkungen auf den vorderen Augenabschnitt beim Andocken eines Femtosekundenlasers an das Patienteninterface

2021 ◽  
Vol 1 (5) ◽  
pp. 164-171
Keyword(s):  
Femtosecond Laser ◽  
Cataract Surgery ◽  
Corneal Thickness ◽  
Anterior Segment ◽  
Anterior Chamber Depth ◽  
Cross Sectional ◽  
Refractive Lens Exchange ◽  
Median Difference ◽  
Refractive Lens ◽  
Intraoperative Oct

Purpose. To compare the intraoperative OCT (optical coherence tomographer) of the femtosecond laser LenSx (Alcon Pharma GmbH, Freiburg) with a Scheimpflug-tomographer and an anterior segment OCT and thus to investigate a possible influence on the anterior segment of the eye when docking the patient’s interface. Material and Methods. A prospective cross-sectional study was conducted with 57 subjects who underwent a planned femtosecond laser-assisted cataract surgery or refractive lens exchange. The eye to be operated on was measured prior to the operation in mydriasis with the Visante OCT (Carl Zeiss Meditec AG, Jena) and the Pentacam AXL (Oculus Optikgeräte GmbH, Wetzlar). During the surgery, images of the anterior segment of the eye were taken by the integrated intraoperative OCT of the laser, which were evaluated afterwards and compared to the values of the other devices. The parameters examined were the internal anterior chamber depth (ACD), nasal and temporal chamber angles, central corneal thickness (CCT) and central lens thickness (LT). Results. The comparison of the intraoperative OCT and the two other devices showed clinically relevant differences in all parameters. The intraoperative OCT showed a 9.19 ± 27.55 μm larger CCT, 0.96 mm (median difference) larger LT, 0.05 mm smaller ACD than the Pentacam AXL and a 21.36 ± 25.50 μm larger CCT, 0.10 mm (median difference) smaller ACD than the Visante OCT. Conclusion. The comparison of the intraoperative OCT with the Visante OCT and the Pentacam AXL shows clinically relevant differences. Changes in the anterior segment of the eye may be due to errors in measurement or docking of the patient’s interface. Keywords. femtosecond laser, OCT, anterior segment of the eye, cataract surgery, refractive lens exchange

Automated real-time instrument tracking for microscope-integrated intraoperative OCT imaging of ophthalmic surgical maneuvers

2015 ◽  
Author(s):  
Mohamed T. El-Haddad ◽  
Justis P. Ehlers ◽  
Sunil K. Srivastava ◽  
Yuankai K. Tao
Keyword(s):  
Real Time ◽  
Instrument Tracking ◽  
Oct Imaging ◽  
Intraoperative Oct

scholarly journals Intraoperative Optical Coherence Tomography-Guided Bleb-sparing Epithelial Exchange: A Modified Approach

2021 ◽  
Author(s):  
Dewang Angmo ◽  
Jyoti Shakrawal ◽  
Ramanjit Sihota
Keyword(s):  
Optical Coherence Tomography ◽  
Intraocular Pressure ◽  
Real Time ◽  
Anterior Segment ◽  
Optical Coherence ◽  
Direct Visualization ◽  
Operating Microscope ◽  
Surgical Time ◽  
Intraoperative Optical Coherence Tomography ◽  
Intraoperative Oct

With the advent of newer technologies, real-time anterior segment optical coherence tomography (OCT) integrated with the operating microscope has become possible. We are proposing the technique of bleb revision with greater precision under direct visualization of bleb anatomy and extent of tissue depth allowing better localization and easy maneuvering with lesser complications. In this surgical technique, bleb revision was performed using intraoperative real-time OCT incorporated in OPMI LUMERA 700 microscope. Live surgical and OCT view were seen on a common screen together. A moderately elevated, diffuse functional bleb was noted after three months of bleb revision in both cases with controlled intraocular pressure. Intraoperative OCT-guided bleb-sparing epithelial exchange is an adjunctive technique for bleb repair surgery with an increased precision of surgery which can reduce complications, minimize surgical time and maximize surgical outcome.

Video Atlas of Anterior Segment Repair and Reconstruction

2019 ◽  
Author(s):  
Amar Agarwal ◽  
Ashar Agarwal ◽  
Ashvin Agarwal ◽  
Athiya Agarwal ◽  
Sreelakshmi P. Amar ◽  
...  
Keyword(s):  
Anterior Segment
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