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Tom Eggert Hansen - One of the best experts on this subject based on the ideXlab platform.
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Gonioscopy after implantation of the semiflexible McGhan/3 M, style 70, anterior chamber lens. A prospective study.
Acta Ophthalmologica, 2009Co-Authors: Kristian Næser, Jørgen Nørrelykke Nissen, Tom Eggert HansenAbstract:Gonioscopy was performed in 64 patients 3-8 (mean 4) months after intracapsular cataract extraction with implantation of the semiflexible McGhan/3 M, style 70, anterior chamber lens. Iris tucking was present in 19 (30%) eyes. Iris-haptic adhesions (strands of iris-like tissue encircling the lens feet) were present in 24 (38%) eyes. Absence of iris tucking was statistically significantly (P less than or equal to 0.05) related to surgical expertise, while the occurrence of iris-haptic adhesions was independent of surgical experience. Pupillar deformation, usually an elongation in the axis of the implant, was present in 50%. The absence or presence of an abnormal Gonioscopy could not with certainty be deduced from the form of the pupil. The majority of gonioscopically visible pathological changes in the chamber angle were located posterior to the trabecular meshwork.
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Gonioscopy after implantation of the semiflexible mcghan 3 m style 70 anterior chamber lens a prospective study
Acta Ophthalmologica, 2009Co-Authors: Kristian Næser, Jørgen Nørrelykke Nissen, Tom Eggert HansenAbstract:Gonioscopy was performed in 64 patients 3-8 (mean 4) months after intracapsular cataract extraction with implantation of the semiflexible McGhan/3 M, style 70, anterior chamber lens. Iris tucking was present in 19 (30%) eyes. Iris-haptic adhesions (strands of iris-like tissue encircling the lens feet) were present in 24 (38%) eyes. Absence of iris tucking was statistically significantly (P less than or equal to 0.05) related to surgical expertise, while the occurrence of iris-haptic adhesions was independent of surgical experience. Pupillar deformation, usually an elongation in the axis of the implant, was present in 50%. The absence or presence of an abnormal Gonioscopy could not with certainty be deduced from the form of the pupil. The majority of gonioscopically visible pathological changes in the chamber angle were located posterior to the trabecular meshwork.
Koichi Matsunaga - One of the best experts on this subject based on the ideXlab platform.
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New Gonioscopy system using only infrared light.
Journal of Glaucoma, 2005Co-Authors: Kota Sugimoto, Koichi Matsunaga, Katsuya Miura, Koji EsakiAbstract:PURPOSE: To describe an infrared Gonioscopy system designed to observe the anterior chamber angle under natural mydriasis in a completely darkened room. METHODS: An infrared light filter was used to modify the light source of the slit-lamp microscope. A television monitor connected to a CCD monochrome camera was used to indirectly observe the angle. RESULTS: Use of the infrared system enabled observation of the angle under natural mydriasis in a completely darkened room. CONCLUSION: Infrared Gonioscopy is a useful procedure for the observation of the angle under natural mydriasis.
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evaluation and comparison of indentation ultrasound biomicroscopy Gonioscopy in relative pupillary block peripheral anterior synechia and plateau iris configuration
Journal of Glaucoma, 2004Co-Authors: Koichi Matsunaga, Toru Sano, Kota Sugimoto, Katsuya Miura, Koji Esaki, Mikio SasohAbstract:PURPOSE: To evaluate and compare the findings and changes of the anterior chamber angle configuration with indentation ultrasound biomicroscopy (UBM) Gonioscopy in relative pupillary block (RPB), peripheral anterior synechia (PAS), and plateau iris configuration (PIC). METHODS: This study included 73 eyes of 52 patients with RPB (n = 26), PAS (n = 21), or PIC (n = 26). First, a conventional UBM scan was performed using a normal size standard eye cup before indentation. Then, for indentation UBM Gonioscopy, scans were performed using a new eye cup that we designed. For evaluation of the angle, angle opening distance 500 and angle recess area were recorded and evaluated with regard to the effect of expansion on the anterior chamber angle. RESULTS: Indentation UBM Gonioscopy showed the characteristic images in each of the eyes. The angle of all examined eyes was significantly widened with indentation (P < 0.01). The angle changes in eyes with RPB were significantly greater than in eyes with PAS or PIC (P < 0.01). CONCLUSION: Indentation UBM Gonioscopy is a very useful method for observing the angle and diagnosis of RPB, PAS, and PIC.
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Evaluation of eyes with relative pupillary block by indentation ultrasound biomicroscopy Gonioscopy.
American journal of ophthalmology, 2004Co-Authors: Koichi Matsunaga, Toru Sano, Mikio Sasoh, Kota Sugimoto, Katsuya Miura, Koji Esaki, Kunio Ito, Yukitaka UjiAbstract:Abstract Purpose To investigate changes in anterior chamber angle configuration with indentation ultrasound biomicroscopy Gonioscopy of relative pupillary block (RPB). Design Cross-sectional study. Methods This study included 26 eyes of 26 patients with RPB. We determined angle opening distance 500 and angle recess area using indentation ultrasound biomicroscopy Gonioscopy and compared a small-sized standard eye cup with a new eye cup with an area for inducing pressure. Results Indentation ultrasound biomicroscopy images documented concavity of the iris in eyes with RPB. Both the new and the small standard eye cups widened the anterior chamber angle significantly (P Conclusions Indentation ultrasound biomicroscopy Gonioscopy is a useful technique for observation and diagnosis of RPB. Using a small standard or the newly designed eye cup, the procedure can be performed easily and without causing corneal damage.
Kristian Næser - One of the best experts on this subject based on the ideXlab platform.
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Gonioscopy after implantation of the semiflexible McGhan/3 M, style 70, anterior chamber lens. A prospective study.
Acta Ophthalmologica, 2009Co-Authors: Kristian Næser, Jørgen Nørrelykke Nissen, Tom Eggert HansenAbstract:Gonioscopy was performed in 64 patients 3-8 (mean 4) months after intracapsular cataract extraction with implantation of the semiflexible McGhan/3 M, style 70, anterior chamber lens. Iris tucking was present in 19 (30%) eyes. Iris-haptic adhesions (strands of iris-like tissue encircling the lens feet) were present in 24 (38%) eyes. Absence of iris tucking was statistically significantly (P less than or equal to 0.05) related to surgical expertise, while the occurrence of iris-haptic adhesions was independent of surgical experience. Pupillar deformation, usually an elongation in the axis of the implant, was present in 50%. The absence or presence of an abnormal Gonioscopy could not with certainty be deduced from the form of the pupil. The majority of gonioscopically visible pathological changes in the chamber angle were located posterior to the trabecular meshwork.
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Gonioscopy after implantation of the semiflexible mcghan 3 m style 70 anterior chamber lens a prospective study
Acta Ophthalmologica, 2009Co-Authors: Kristian Næser, Jørgen Nørrelykke Nissen, Tom Eggert HansenAbstract:Gonioscopy was performed in 64 patients 3-8 (mean 4) months after intracapsular cataract extraction with implantation of the semiflexible McGhan/3 M, style 70, anterior chamber lens. Iris tucking was present in 19 (30%) eyes. Iris-haptic adhesions (strands of iris-like tissue encircling the lens feet) were present in 24 (38%) eyes. Absence of iris tucking was statistically significantly (P less than or equal to 0.05) related to surgical expertise, while the occurrence of iris-haptic adhesions was independent of surgical experience. Pupillar deformation, usually an elongation in the axis of the implant, was present in 50%. The absence or presence of an abnormal Gonioscopy could not with certainty be deduced from the form of the pupil. The majority of gonioscopically visible pathological changes in the chamber angle were located posterior to the trabecular meshwork.
Tin Aung - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of the Anterior Segment Angle-to-Angle Scan of Cirrus High-Definition Optical Coherence Tomography and Comparison With Gonioscopy and With the Visante OCT.
Investigative ophthalmology & visual science, 2017Co-Authors: Tin A. Tun, Tin Aung, Mani Baskaran, Shamira A. Perera, Shayne S. Tan, R. HusainAbstract:Purpose To evaluate the diagnostic performance of the anterior segment angle-to-angle scan of the Cirrus high-definition optical coherence tomography (HD-OCT) in detecting eyes with closed angles. Methods All subjects underwent dark-room Gonioscopy by an ophthalmologist. A technician performed anterior segment imaging with Cirrus (n = 202) and Visante OCT (n = 85) under dark-room conditions. All eyes were categorized by two masked graders as per number of closed quadrants. Each quadrant of anterior chamber angle was categorized as a closed angle if posterior trabecular meshwork could not be seen on Gonioscopy or if there was any irido-corneal contact anterior to scleral spur in Cirrus and Visante images. An eye was graded as having a closed angle if two or more quadrants were closed. Agreement and area under the curve (AUC) were performed. Results There were 50 (24.8%) eyes with closed angles. The agreements of closed-angle diagnosis (by eye) between Cirrus HD-OCT and Gonioscopy (k = 0.59; 95% confidence interval (CI) 0.45-0.72; AC1 = 0.76) and between Cirrus and Visante OCT (k = 0.65; 95% CI 0.48-0.82, AC1 = 0.77) were moderate. The AUC for diagnosing the eye with gonioscopic closed angle by Cirrus HD-OCT was good (AUC = 0.86; sensitivity = 83.33; specificity = 77.78). The diagnostic performance of Cirrus HD-OCT in detecting the eyes with closed angles was similar to that of Visante (AUC 0.87 vs. 0.9, respectively; P = 0.51). Conclusions The anterior segment angle-to-angle scans of Cirrus HD-OCT demonstrated similar diagnostic performance as Visante in detecting gonioscopic closed angles. The agreement between Cirrus and Gonioscopy for detecting eyes with closed angles was moderate.
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High resolution iridocorneal angle imaging system by axicon lens assisted Gonioscopy.
Scientific reports, 2016Co-Authors: Sandeep Menon Perinchery, Tin Aung, Mani Baskaran, Anant Shinde, Xun Jie Jeesmond Hong, Vadakke Matham MurukeshanAbstract:Direct visualization and assessment of the iridocorneal angle (ICA) region with high resolution is important for the clinical evaluation of glaucoma. However, the current clinical imaging systems for ICA do not provide sufficient structural details due to their poor resolution. The key challenges in achieving high quality ICA imaging are its location in the anterior region of the eye and the occurrence of total internal reflection due to refractive index difference between cornea and air. Here, we report an indirect axicon assisted Gonioscopy imaging probe with white light illumination. The illustrated results with this probe shows significantly improved visualization of structures in the ICA including TM region, compared to the current available tools. It could reveal critical details of ICA and expected to aid management by providing information that is complementary to angle photography and Gonioscopy.
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Angle assessment by EyeCam, goniophotography, and Gonioscopy.
Journal of glaucoma, 2012Co-Authors: Mani Baskaran, Rajesh S. Kumar, David S Friedman, Tin A. Tun, Shamira A. Perera, Monisha E. Nongpiur, Judy Park, Tin AungAbstract:Purpose To compare EyeCam (Clarity Medical Systems, Pleasanton, CA) and goniophotography in detecting angle closure, using Gonioscopy as the reference standard. Methods In this hospital-based, prospective, cross-sectional study, participants underwent Gonioscopy by a single observer, and EyeCam imaging and goniophotography by different operators. The anterior chamber angle in a quadrant was classified as closed if the posterior trabecular meshwork could not be seen. A masked observer categorized the eyes as per the number of closed quadrants, and an eye was classified as having angle closure if there were 2 or more quadrants of closure. Agreement between the methods was analyzed by κ statistic and comparison of area under receiver operating characteristic curves (AUC). Results Eighty-five participants (85 eyes) were included, the majority of whom were Chinese. Angle closure was detected in 38 eyes (45%) with Gonioscopy, 40 eyes (47%) using EyeCam, and 40 eyes (47%) with goniophotography (P=0.69 in both comparisons, McNemar test). The agreement for angle closure diagnosis (by eye) between Gonioscopy and the 2 imaging modalities was high (κ=0.86; 95% Confidence Interval (CI), 0.75-0.97), whereas the agreement between EyeCam and goniophotography was not as good (κ=0.72; 95% CI, 0.57-0.87); largely due to lack of agreement in the nasal and temporal quadrants (κ=0.55 to 0.67). The AUC for detecting eyes with gonioscopic angle closure was similar for goniophotography and EyeCam (AUC 0.93, sensitivity=94.7%, specificity=91.5%; P>0.95). Conclusions EyeCam and goniophotography have similarly high sensitivity and specificity for the detection of gonioscopic angle closure.
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demonstration of angle widening using eyecam after laser peripheral iridotomy in eyes with angle closure
American Journal of Ophthalmology, 2010Co-Authors: Shamira A. Perera, Rajesh S. Kumar, David S Friedman, Mani Baskaran, Tin A. Tun, Desmond Quek, Tin AungAbstract:Purpose To evaluate EyeCam in detecting changes in angle configuration after laser peripheral iridotomy (LPI) in comparison to Gonioscopy, the reference standard. Design Prospective comparative study. Methods Twenty-four subjects (24 eyes) with primary angle-closure glaucoma (PACG) were recruited. Gonioscopy and EyeCam (Clarity Medical Systems) imaging of all 4 angle quadrants were performed, before and 2 weeks after LPI. Images were graded according to angle structures visible by an observer masked to clinical data or the status of LPI, and were performed in a random order. Angle closure in a quadrant was defined as the inability to visualize the posterior trabecular meshwork. We determined the number of quadrants with closed angles and the mean number of clock hours of angle closure before and after LPI in comparison to Gonioscopy. Results Using EyeCam, all 24 eyes showed at least 1 quadrant of angle widening after LPI. The mean number of clock hours of angle closure decreased significantly, from 8.15 ± 3.47 clock hours before LPI to 1.75 ± 2.27 clock hours after LPI ( P P = .009) quadrants with EyeCam. Intra-observer reproducibility of grading the extent of angle closure in clock hours in EyeCam images was moderate to good (intraclass correlation coefficient 0.831). Conclusions EyeCam may be used to document changes in angle configuration after LPI in eyes with PACG.
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comparison of Gonioscopy and anterior segment ocular coherence tomography in detecting angle closure in different quadrants of the anterior chamber angle
Ophthalmology, 2008Co-Authors: Lisandro M Sakata, Han T Aung, Paul J Foster, Rajesh S. Kumar, David S Friedman, Raghavan Lavanya, Tin AungAbstract:Purpose To compare the performance of Gonioscopy and anterior segment (AS) optical coherence tomography (OCT) in detecting angle closure in the different quadrants of the anterior chamber angle (ACA). Design Cross-sectional observational study. Participants Five hundred two consecutive subjects more than 50 years of age with no previous ophthalmic problems recruited from a community clinic in Singapore. Methods All subjects underwent Gonioscopy and AS OCT imaging in the dark. Using Gonioscopy, the ACA was graded using the Scheie system by a single examiner masked to AS OCT findings. Main Outcome Measures The ACA in a particular quadrant was classified as closed if the posterior trabecular meshwork could not be seen on Gonioscopy. A closed ACA on AS OCT imaging was defined by the presence of any contact between the iris and angle wall anterior to the scleral spur. Results After excluding eyes with poor image quality, a total of 423 right eyes were included in the analysis. A closed angle in at least 1 quadrant was observed in 59% of the eyes by AS OCT and in 33% of the eyes by Gonioscopy ( P Conclusions The highest rates of closed angles on Gonioscopy and AS OCT images were observed in the superior quadrant. Anterior segment OCT tended to detect more closed ACAs than Gonioscopy, particularly in the superior and inferior quadrants. Variations in the iris profile and level of iridoangle contact also may explain some of the differences seen between Gonioscopy and AS OCT.
Koji Esaki - One of the best experts on this subject based on the ideXlab platform.
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New Gonioscopy system using only infrared light.
Journal of Glaucoma, 2005Co-Authors: Kota Sugimoto, Koichi Matsunaga, Katsuya Miura, Koji EsakiAbstract:PURPOSE: To describe an infrared Gonioscopy system designed to observe the anterior chamber angle under natural mydriasis in a completely darkened room. METHODS: An infrared light filter was used to modify the light source of the slit-lamp microscope. A television monitor connected to a CCD monochrome camera was used to indirectly observe the angle. RESULTS: Use of the infrared system enabled observation of the angle under natural mydriasis in a completely darkened room. CONCLUSION: Infrared Gonioscopy is a useful procedure for the observation of the angle under natural mydriasis.
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evaluation and comparison of indentation ultrasound biomicroscopy Gonioscopy in relative pupillary block peripheral anterior synechia and plateau iris configuration
Journal of Glaucoma, 2004Co-Authors: Koichi Matsunaga, Toru Sano, Kota Sugimoto, Katsuya Miura, Koji Esaki, Mikio SasohAbstract:PURPOSE: To evaluate and compare the findings and changes of the anterior chamber angle configuration with indentation ultrasound biomicroscopy (UBM) Gonioscopy in relative pupillary block (RPB), peripheral anterior synechia (PAS), and plateau iris configuration (PIC). METHODS: This study included 73 eyes of 52 patients with RPB (n = 26), PAS (n = 21), or PIC (n = 26). First, a conventional UBM scan was performed using a normal size standard eye cup before indentation. Then, for indentation UBM Gonioscopy, scans were performed using a new eye cup that we designed. For evaluation of the angle, angle opening distance 500 and angle recess area were recorded and evaluated with regard to the effect of expansion on the anterior chamber angle. RESULTS: Indentation UBM Gonioscopy showed the characteristic images in each of the eyes. The angle of all examined eyes was significantly widened with indentation (P < 0.01). The angle changes in eyes with RPB were significantly greater than in eyes with PAS or PIC (P < 0.01). CONCLUSION: Indentation UBM Gonioscopy is a very useful method for observing the angle and diagnosis of RPB, PAS, and PIC.
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Evaluation of eyes with relative pupillary block by indentation ultrasound biomicroscopy Gonioscopy.
American journal of ophthalmology, 2004Co-Authors: Koichi Matsunaga, Toru Sano, Mikio Sasoh, Kota Sugimoto, Katsuya Miura, Koji Esaki, Kunio Ito, Yukitaka UjiAbstract:Abstract Purpose To investigate changes in anterior chamber angle configuration with indentation ultrasound biomicroscopy Gonioscopy of relative pupillary block (RPB). Design Cross-sectional study. Methods This study included 26 eyes of 26 patients with RPB. We determined angle opening distance 500 and angle recess area using indentation ultrasound biomicroscopy Gonioscopy and compared a small-sized standard eye cup with a new eye cup with an area for inducing pressure. Results Indentation ultrasound biomicroscopy images documented concavity of the iris in eyes with RPB. Both the new and the small standard eye cups widened the anterior chamber angle significantly (P Conclusions Indentation ultrasound biomicroscopy Gonioscopy is a useful technique for observation and diagnosis of RPB. Using a small standard or the newly designed eye cup, the procedure can be performed easily and without causing corneal damage.