scholarly journals Comparison of inner macular thickness and superficial macular capillary vessel density acquired using classic and high-definition optical coherence tomography angiography scans

2021 ◽  
Vol 3 (1) ◽  
pp. 43-54
Author(s):  
Gabor Hollo
Keyword(s):  
Optical Coherence Tomography ◽  
Retinal Thickness ◽  
Open Angle Glaucoma ◽  
Imaging Study ◽  
Vessel Density ◽  
Optical Coherence ◽  
High Definition ◽  
Normal Value ◽  
Image Area ◽  
Clinically Significant

Background: In ophthalmology, thickness and vessel density (VD) measurements for the 6 x 6 mm inner macular retinal area have received increasing attention in glaucomatous progression research. For this area, the Angiovue optical coherence tomography system introduced a 304 x 304 A/B scans function (classic Angio Retina scan) in 2014, and a 400 x 400 A/B scans function (high-definition [HD] Angio Retina scan) in 2017. These scan types cannot be used in combination for the software provided for progression analysis.Purpose: Since losing data for 3 years may negatively influence progression analysis, we investigated whether clinically significant differences exist between consecutive measurements acquired with these scan types on the same eyes.Methods: As a part of our noninterventional prospective glaucoma imaging study, primary-open-angle glaucoma patients (POAG group), and ocular hypertensive and healthy control participants (structurally undamaged group) were imagedusing both the classic and the HD Angio Retina scans, respectively, without changing the patients’ position. High-quality images were obtained on 12 POAG eyes of 12 consecutive POAG patients, and 10 healthy and ocular hypertensive eyes of 10 consecutive participants before the data collection had to be suspended due to the new coronavirus epidemic.Results: For Early Treatment Diabetic Retinopathy Study image area, the mean difference (classic minus HD value) was 0.02 ± 0.37 μm for inner retinal thickness (P = 0.869) and 0.33 ± 1.33 % (P = 0.452) for superficial capillary VD in the structurally normal group (between-methods difference: ≤ 0.8% of the respective normal value). In the POAG group, the corresponding figures were -0.07 ± 1.22 μm for inner retinal thickness (P = 0.854; between-methods difference: 0.6% of the normal value) and 1.12 ± 2.58 % for superficial capillary VD (P = 0.158; classic scan value minus HD scan value: 1.12 ± 2.58 %; 2.3% of the normal value).Conclusion: Our results suggest that combined use of thickness and VD values for structurally normal eyes and thickness values for POAG eyes derived from classic and HD scans, respectively, for progression analysis can be reasonable since the differences between the corresponding values are small. However, combining the corresponding VD parameters for POAG eyes is useful only when the follow-up time before the scan type change is long enough to counterbalance the effect of the change on the result.  

scholarly journals The Role of Optical Coherence Tomography Angiography in Moderate and Advanced Primary Open-Angle Glaucoma

2021 ◽  
Author(s):  
Yadollah Eslami ◽  
Sepideh Ghods ◽  
Massood Mohammadi ◽  
Mona Safizadeh ◽  
Ghasem Fakhraie ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Coherence Tomography Angiography ◽  
Primary Open Angle Glaucoma ◽  
Open Angle Glaucoma ◽  
Vessel Density ◽  
Mean Deviation ◽  
Optical Coherence ◽  
Open Angle ◽  
The Mean ◽  
Inferior Quadrant

Abstract Purpose: To evaluate the relationship between structure and function in moderate and advanced primary open-angle glaucoma (POAG) and to determine the accuracy of structure and vasculature for discriminating moderate from advanced POAG.Methods: In this cross-sectional study 25 eyes with moderate and 40 eyes with advanced POAG were enrolled. All eyes underwent measurement of the thickness of circumpapillary retinal nerve fiber layer (cpRNFL) and macular ganglion cell complex (GCC), and optical coherence tomography angiography (OCTA) of the optic nerve head (ONH) and macula. Visual field (VF) was evaluated by Swedish interactive threshold algorithm and 24-2 and 10-2 patterns. The correlation between structure and vasculature and the mean deviation (MD) of the VFs was evaluated by a partial correlation coefficient. The area under the receiver operating characteristic curve (AUC) was applied for assessing the power of variables for discrimination moderate from advanced POAG.Results: Superior cpRNFL, superior GCC, whole image vessel density (wiVD) of the ONH area, and vessel density in inferior quadrant of perifovea had the strongest correlation with the mean deviation (MD) of the VF 24-2 (r= .351, .558, .649 and .397; p< .05). The greatest AUCs belonged to inferior cpRNFL (.789), superior GCC (.818), vessel density of the inferior hemifield of ONH area (.886), and vessel density in inferior quadrant of perifovea (.833) without statistically significant difference in pairwise comparison.Conclusion: Vasculature has a stronger correlation than the structure with MD in moderate and advanced POAG and is as accurate as structure in discrimination moderate from advanced POAG.

scholarly journals A comparison of the diagnostic ability of vessel density and structural measurements of optical coherence tomography in primary open angle glaucoma

PLoS ONE ◽  
2017 ◽  
Vol 12 (3) ◽  
pp. e0173930 ◽  
Author(s):  
Harsha L. Rao ◽  
Zia S. Pradhan ◽  
Robert N. Weinreb ◽  
Mohammed Riyazuddin ◽  
Srilakshmi Dasari ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Primary Open Angle Glaucoma ◽  
Open Angle Glaucoma ◽  
Vessel Density ◽  
Optical Coherence ◽  
Open Angle ◽  
Diagnostic Ability

scholarly journals Vessel Density and Retinal Thickness from Optical Coherence Tomography Angiography as New Indexes in Adolescent Myopia

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Qin Zhu ◽  
Chunwen Chen ◽  
Jingyan Yao
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Coherence Tomography Angiography ◽  
Retinal Thickness ◽  
Blood Perfusion ◽  
Cross Sectional Study ◽  
Vessel Density ◽  
Optical Coherence ◽  
Cross Sectional ◽  
Foveal Region ◽  
Almost All

Purpose. To evaluate and quantify blood perfusion and retinal thickness (RT) from the perspective of quadrants by optical coherence tomography angiography (OCTA) in adolescents with myopia and explore the relationship between axial elongation and related indexes of OCTA. Methods. A total of 88 subjects (149 eyes) with different degrees of myopia were included in this cross-sectional study. Vessel density (VD) and RT of quadrants in macular and peripheral regions were measured through OCTA. Results. The superficial VD (SVD) of the parainferior region was significantly correlated with axial length (AL) between the emmetropia (EM) group and high myopia (HI) group ( P = 0.012 ). There were significant differences in deep VD (DVD) in all quadrants, except for the foveal, perifoveal, and peri-inferior regions ( P > 0.05 ). However, there were significant alterations in the whole, parainferior, and perinasal regions ( P = 0.030 , 0.023, and 0.035) in the low-to-moderate myopia (L–M) group compared with those in the HI group. There were significant differences in the RT in all quadrants, except for the foveal, paratemporal, and paranasal regions ( P > 0.05 ) between the EM and L–M groups and the foveal region ( P > 0.05 ) between the EM and HI groups. Nevertheless, only RT in the peri-inferior region of the L–M and HI groups showed significant differences. AL was negatively correlated with SVD in the perifoveal and parainferior regions (r = −0.179, P = 0.029 ; r = −0.227, P = 0.005 ) and inversely correlated with DVD and RT in almost all quadrants, except for the foveal region (r = −0.020, P = 0.811 ; r = 0.135, P = 1.000 ). Conclusion. DVD and RT were closely associated with the severity of myopia and might be new indexes in assessing and detecting myopia development via OCTA.

Quantitative assessment of macular and peripapillary microvasculature using optical coherence tomography angiography in glaucomatous versus healthy eyes

QJM ◽  
2021 ◽  
Vol 114 (Supplement_1) ◽  
Author(s):  
Amr M Sanad ◽  
Mohamed M Mahgoub ◽  
Weam M Ebeid ◽  
Rabab A Mahmoud
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Coherence Tomography Angiography ◽  
Primary Open Angle Glaucoma ◽  
Open Angle Glaucoma ◽  
Vessel Density ◽  
Optical Coherence ◽  
Open Angle ◽  
University Hospitals ◽  
Microvascular Changes ◽  
Group 2

Abstract Background Glaucoma is the leading cause of irreversible blindness worldwide. With the growing burden of glaucoma, we looked for better tools for early diagnosis and monitoring. Aim of the Work using optical coherence tomography angiography (OCTA) vessel density (VD) to document, quantify and compare microvasculature changes in macula and peripapillary region between healthy and moderate to severe primary open angle glaucoma eyes. Patients and Methods A comparative interventional prospective study was conducted on 28 eyes of 14 subjects, recruited from Ain Shams University hospitals outpatient clinic, and were subjected to imaging procedure during the period from January 2020 to May 2020. Subjects were divided into two groups: Group 1 of 14 eyes of 9 patients with moderate to severe primary open angle glaucoma (POAG), and group 2 of 14 eyes of 7 healthy sex and age-matched controls. Results a statistically significant decrease was found in VD in the peripapillary region (P &lt; 0.001) and superficial macular regions in glaucoma subjects (P &lt; 0.001). Conclusion OCTA proved a quantitative decrease in both peripapillary and macular vessel density as a parameter of microvascular changes associated with moderate to severe POAG. These results reflect damage to tissues relevant to the pathophysiology of POAG demonstrating OCTA importance with respect to diagnosing glaucoma and understanding the pathophysiology of this disease and, guiding future studies to evaluate more potential uses of this technology in the actual assessment of patients with glaucoma.

Glaucoma diagnostic capabilities of macular vessel density on optical coherence tomography angiography: superficial versus deep layers

2021 ◽  
pp. bjophthalmol-2020-318449
Author(s):  
Jin Yeong Lee ◽  
Joong Won Shin ◽  
Min Kyung Song ◽  
Ji Wook Hong ◽  
Michael S Kook
Keyword(s):  
Optical Coherence Tomography ◽  
Open Angle Glaucoma ◽  
Plexiform Layer ◽  
Vessel Density ◽  
Inner Plexiform Layer ◽  
Optical Coherence ◽  
Central Visual Field ◽  
Deep Layers ◽  
Diagnostic Capabilities ◽  
Better Than

Background/aimsTo compare glaucoma diagnostic capabilities of superficial and deep macular vessel density (mVD) parameters in a series of healthy and open-angle glaucoma (OAG) eyes with central visual field (CVF) loss.MethodsWe consecutively enrolled 113 eyes of 113 patients with OAG and 47 eyes of 47 healthy participants in a retrospective manner. Superficial and deep mVDs were measured at foveal, parafoveal and perifoveal locations on optical coherence tomography (OCT) angiography. The macular ganglion cell-inner plexiform layer thickness (mGCIPLT) was measured on OCT as a reference standard. Glaucoma diagnostic capabilities of superficial and deep mVD parameters were assessed according to the glaucoma stage. Factors associated with the CVF mean sensitivity (MS) were evaluated using linear regression analyses in the OAG eyes.ResultsGlaucoma diagnostic capabilities of superficial perifoveal and parafoveal mVDs were significantly better than those of deep perifoveal and parafoveal mVDs, regardless of the glaucoma stage (both p<0.05). Both mGCIPLT and superficial parafoveal mVD were significantly associated with CVF MS (β-coefficients=10.567 and 21.147, respectively, both p<0.05), independent of age and glaucoma severity.ConclusionSuperficial mVD parameters showed significantly greater glaucoma diagnostic capabilities and better correlation with CVF MS compared with deep mVD parameters.

Repeatability of Retinal Macular Thickness Measurements in Patients with Clinically Significant Macular Edema Using Two Different Scanning Protocols of Spectralis Optical Coherence Tomography

2015 ◽  
Vol 234 (3) ◽  
pp. 167-171 ◽  
Author(s):  
Tito Fiore ◽  
Marco Lupidi ◽  
Sofia Androudi ◽  
Fabrizio Giansanti ◽  
Daniela Fruttini ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Macular Edema ◽  
Retinal Thickness ◽  
Diabetic Patients ◽  
Optical Coherence ◽  
Significant Difference ◽  
Clinically Significant Macular Edema ◽  
Clinically Significant ◽  
Thickness Measurements

Objective: To determine the repeatability of Spectralis optical coherence tomography (OCT) retinal thickness measurements in diabetic patients with clinically significant macular edema (CSME) using two different scanning protocols. Methods: Seventy-one eyes of 71 diabetic patients with CSME were included in the study. Coefficients of repeatability and intrasession variation coefficients were tested with 20 × 15 degree raster scans consisting of 19 or 37 high-resolution line scans (15 or 8 frames per scan, respectively) that were repeated 2 times by 1 experienced examiner. The first scan was set as the reference scan; the second scan was the follow-up scan and was performed with the use of the follow-up mode. Results: The mean and standard deviation for the central foveal subfield (CSF) using the first scanning method was 404 ± 88 μm, while it was 399 ± 86 μm using the second protocol, which was not statistically significantly different (p = 0.35, paired test). Particularly examining the CSF, the coefficient of repeatability was 1.48 (6.00 µm) and 1.49 (5.95 µm) for the 19- and the 37-B-scan acquisition, respectively, showing a nonstatistically significant difference (p < 0.001). Conclusions: Retinal thickness measurements in diabetic patients with CSME are repeatable using both scanning protocols (19 or 37 B-scans) with Spectralis OCT. The repeatability of the retinal thickness measurement does not improve by increasing the number of B-scans from 19 to 37.

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