scholarly journals Comparison of Optical Coherence Tomography Angiography Metrics in Primary Angle-Closure Glaucoma and Normal-Tension Glaucoma

2020 ◽  
Author(s):  
Ruyue Shen ◽  
Yu Wang ◽  
Carol Cheung ◽  
Clement Tham ◽  
Poemen Chan
Keyword(s):  
Optical Coherence Tomography ◽  
Disease Severity ◽  
Optical Coherence Tomography Angiography ◽  
Normal Tension Glaucoma ◽  
Angle Closure ◽  
Optical Coherence ◽  
Fiber Layer ◽  
Primary Angle Closure Glaucoma ◽  
Rnfl Thickness ◽  
Similar Disease

Abstract Purpose: To investigate the peripapillary vascular metrics in early normal tension glaucoma (NTG) and early primary angle closure glaucoma (PACG) eyes using optical coherence tomography angiography (OCT-A).Methods: One or both eyes of each subjects were imaged for a 3x3mm peripapillary region by swept-source OCT-A (DRI-OCT Triton, Topcon, Japan) and assessed by an automated MATLAB program. OCT-A metrics including circumpapillary vessel density (cpVD) and fractal dimension (cpFD) were compared. Their association with visual field (VF) parameters and retinal nerve fiber layer (RNFL) thickness were determined.Results: Sixty-eight eyes of 51 PACG, 68 eyes of 48 NTG, and 68 eyes of 49 control subjects were cross-sectionally analyzed. NTG eyes had significantly lower global cpVD (52.369±0.781%) compared with PACG eyes (55.389±0.721%, P=0.004) that had comparable disease severity and average RNFL thickness. Multivariable analysis reviewed that, for PACG and NTG eyes, decreased cpVD ([PACG] β=-4.242; CI:-8.120, -0.363 vs [NTG] β=-5.531; CI:-9.472, -1.590) and cpFD ([PACG] β=-8.894;CI:-11.925, -5.864 vs [NTG] β=-12.064; CI:-17.095, -6.932) were associated with decreased RNFL thickness (all P≤0.032); with a stronger association between decrease cpFD and decreased RNFL thickness in NTG eyes (Fisher’s Z-test, P=0.045). Decreased cpVD was associated with decrease mean deviation (MD) in NTG eyes (β=-0.707; CI:-1.090, -0.324; P≤0.001) and not associated with the visual field parameters in PACG eyes. Conclusions: Early NTG had lower global cpVD compared with early PACG, despite similar disease severity and average RNFL thickness. Précis:Optical coherence tomography angiography observed a lower peripapillary microvascular perfusion in early NTG eyes compared with early PACG eyes, despite similar disease severity and retinal nerve fiber layer thickness.

scholarly journals Comparison of optical coherence tomography angiography metrics in primary angle-closure glaucoma and normal-tension glaucoma

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ruyue Shen ◽  
Yu Meng Wang ◽  
Carol Y. Cheung ◽  
Poemen P. Chan ◽  
Clement C. Tham
Keyword(s):  
Optical Coherence Tomography ◽  
Visual Field ◽  
Disease Severity ◽  
Optical Coherence Tomography Angiography ◽  
Normal Tension Glaucoma ◽  
Angle Closure Glaucoma ◽  
Angle Closure ◽  
Primary Angle Closure ◽  
Primary Angle Closure Glaucoma ◽  
Rnfl Thickness

AbstractTo investigate the peripapillary vascular metrics in early normal tension glaucoma (NTG) and early primary angle closure glaucoma (PACG) eyes using optical coherence tomography angiography (OCT-A). One or both eyes of each subject were imaged for a 3 × 3 mm peripapillary region by swept-source OCT-A (DRI-OCT Triton, Topcon, Japan) and assessed by an automated MATLAB program. OCT-A metrics including circumpapillary vessel density (cpVD) and fractal dimension (cpFD) were compared. Their association with visual field (VF) parameters and retinal nerve fiber layer (RNFL) thickness were determined. Sixty-eight eyes of 51 PACG, 68 eyes of 48 NTG, and 68 eyes of 49 control subjects were cross-sectionally analyzed. NTG eyes had significantly lower global cpVD (52.369 ± 0.781%) compared with PACG eyes (55.389 ± 0.721%, P = 0.004) that had comparable disease severity and average RNFL thickness. Multivariable analysis revealed that, for PACG and NTG eyes, decreased cpVD ([PACG] β = −4.242; CI: −8.120, −0.363 vs [NTG] β = −5.531; CI: −9.472, −1.590) and cpFD ([PACG] β = −8.894;CI: −11.925, −5.864 vs [NTG] β = −12.064; CI: −17.095, −6.932) were associated with decreased RNFL thickness (all P ≤ 0.032); with a stronger association between decrease cpFD and decreased RNFL thickness in NTG eyes (P = 0.028). Decreased cpVD was associated with decrease mean deviation (MD) in NTG eyes (β = −0.707; CI: −1.090, −0.324; P ≤ 0.001) and not associated with the visual field parameters in PACG eyes. Early NTG had lower global cpVD compared with early PACG, despite similar disease severity and average RNFL thickness.

scholarly journals Peripapillary vessel density measurement of quadrant and clock-hour sectors in primary angle closure glaucoma using optical coherence tomography angiography

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Yongdong Lin ◽  
Shirong Chen ◽  
Mingzhi Zhang
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Coherence Tomography Angiography ◽  
Vessel Density ◽  
Angle Closure ◽  
Optical Coherence ◽  
Diagnostic Ability ◽  
Primary Angle Closure ◽  
Primary Angle Closure Glaucoma ◽  
Rnfl Thickness ◽  
Inferior Quadrant

Abstract Background The purpose of this study was to investigate diagnostic ability of peripapillary vessel density of primary angle closure glaucoma (PACG) eyes in quadrant and clock-hour sectors by optical coherence tomography angiography (OCTA). Methods This was a cross-sectional study on forty-one PACG patients (41eyes) and twenty-seven healthy subjects (27 eyes). All subjects underwent OCTA (DRI OCT Triton; Topcon Corporation, Tokyo, Japan) and peripapillary retinal nerve fiber layer (RNFL) thickness imaging with swept-source optical coherence tomography (OCT). The peripapillary vessel density of quadrant and clock-hour sectors was quantified by imageJ software. The diagnostic capability of OCTA and OCT parameters was evaluated by the areas under the receiver operating characteristics curves (AUCs). Pearson correlation analysis or Spearman correlation test was used to evaluate the correlation between vessel density parameters and related factors. Results Compared with the control group, the peripapillary vessel density of glaucomatous group was lower to different degrees in the four quadrants and each clock-hour sectors, and vessel density reduced most at 7 o’clock. The difference between the diagnostic ability of peripapillary vessel density and peripapillary RNFL thickness was not statistically significant, except 4 o’clock and inferior quadrant. The inferior quadrant peripapillary vessel density had the best diagnostic value (AUC0.969), followed by the 7 o’clock vessel density (AUC0.964), average vessel density (AUC0.939) and the 7 o’clock RNFL thickness (AUC0.919). The average peripapillary vessel density was correlated with average RNFL and visual field (VF) mean deviation (P < 0.001). Conclusions In PACG, the diagnostic ability of the peripapillary vessel density is equivalent to the peripapillary RNFL thickness. Understanding spatial characteristics of the peripapillary vessel density in PACG may be helpful for clinical diagnosis and monitoring the progress of diseases.

scholarly journals Determination of Referential Rates for Optical Coherence Tomography and Optical Coherence Tomography Angiography Flow Deficits in the Macular Choriocapillaris in Ophthalmologically Healthy Children

Medicina ◽  
2020 ◽  
Vol 56 (5) ◽  
pp. 238
Author(s):  
Viktorija Bakstytė ◽  
Liveta Šniurevičiūtė ◽  
Evelina Šimienė ◽  
Justina Skruodytė ◽  
Ingrida Janulevičienė
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Coherence Tomography Angiography ◽  
Healthy Children ◽  
Optical Coherence ◽  
Fiber Layer ◽  
Swept Source ◽  
Rnfl Thickness ◽  
Swept Source Oct ◽  
New Research

Background and Objectives: Despite the growing number of new research publications, normative references for children’s optical coherence tomography (OCT) parameters are still not completed. We chose to explore this topic because of the lack of normative parameters that is due to an improvement in different technologies and instruments. Our aim was to determine referential rates of retinal nerve fiber layer (RNFL) thickness and flow deficits (FD%) in the macular choriocapillaris (CC) in normal eyes of ophthalmologically healthy children. Materials and Methods: Ophthalmologically healthy 8- to 14-year-old individuals participated (n = 75) in this study. OCT images were taken using an swept-source-OCT (SS-OCT) instrument (DRI-OCT Triton, Topcon, Tokyo, Japan). The early treatment diabetic retinopathy study (EDTRS) grid (6 × 6 mm) divided the RNFL into the thickness maps. The FD% values of the CC were calculated on the 3 × 3-mm scans in a 1-mm circle (C1), 1.5-mm rim (R1.5), and the entire 2.5-mm circle (C2.5), and on the 6 x 6-mm scans in a 1-mm circle (C1), 1.5-mm rim (R1.5), the entire 2.5-mm circle (C2.5), 2.5-mm rim (R2.5), and 5-mm circle (C5). Results: Both scan quantifications of FD% in the C1, C2.5, and R1.5 sectors were similar, but the 6 × 6-mm scan measurements were statistically significantly smaller than the 3 × 3-mm ones. Significant moderate correlations were found between axial length (AxL) and FD% in the 6 × 6-mm scans, namely C1 (r = −0.347, p = 0.002), C2.5 (r = −0.337, p = 0.003), R1.5 (r = −0.328, p = 0.004), R2.5 (r = −0.306, p = 0.008), and C5 (r = −0.314, p = 0.006). Conclusions: The thinnest RNFL layers were on the temporal and nasal sides. FD% values in the C1, C2.5, and R1.5 sectors were similar between the 3 × 3-mm and 6 × 6-mm scans. The negative moderate correlations between AxL and FD% were found in all C1, C2.5, C5, R1.5, and R2.5 sectors of the 6 × 6-mm scans. Further prospective studies are needed to determine more accurate normative references for children’s OCT parameters.

scholarly journals Determinants of vessel defects in superficial and deep vascular layers in normal-tension glaucoma using optical coherence tomography angiography

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jiyun Lee ◽  
Chan Kee Park ◽  
Hae-Young Lopilly Park
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Coherence Tomography Angiography ◽  
Deep Layer ◽  
Plexiform Layer ◽  
Normal Tension Glaucoma ◽  
Mean Deviation ◽  
Inner Plexiform Layer ◽  
Optical Coherence ◽  
Fiber Layer ◽  
Cross Sectional

AbstractWe investigated the characteristics of localized vessel density defects (VD) either in the deep or superficial vascular layer of normal-tension glaucoma patients using optical coherence tomography angiography (OCTA). In this retrospective, cross-sectional study, 74 eyes with localized retinal nerve fiber layer (RNFL) defect were included. The relationships between the widths of the VD in the superficial and deep layer and ocular factors were evaluated. Eyes with greater deep VD were significantly older (P = 0.023). The IOP measured at OCTA exam was significantly related to the width of the deep VD (P = 0.009). By contrast, average ganglion cell inner plexiform layer thickness (GCIPLT) was substantially related to the width of the superficial VD (P = 0.004). In logistic regression analysis, aging was noticeably associated with wider deep VD, whereas worse mean deviation (MD) had a significant association with wider superficial VD (P = 0.001, P = 0.003, respectively). In sum, while changes of the superficial layer seemed an overall ramification of glaucomatous damages, the deep layer was more likely to be affected by factors related to ocular microcirculation, such as IOPs and older age. Thus, looking into the deep vascular layer using OCTA could identify risk factors related to the disturbance in ocular microcirculation.

scholarly journals Optical Coherence Tomography Angiography and Visual Field Progression in Primary Angle Closure Glaucoma

2020 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Harsha L. Rao ◽  
Thanemozhi Srinivasan ◽  
Zia S. Pradhan ◽  
Shruthi Sreenivasaiah ◽  
Dhanaraj A.S. Rao ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Visual Field ◽  
Optical Coherence Tomography Angiography ◽  
Angle Closure Glaucoma ◽  
Angle Closure ◽  
Optical Coherence ◽  
Visual Field Progression ◽  
Primary Angle Closure ◽  
Primary Angle Closure Glaucoma

scholarly journals Determinants of Vessel Defects in Superficial and Deep Vascular Layers in Normal-Tension Glaucoma Using Optical Coherence Tomography Angiography

2021 ◽  
Author(s):  
Jiyun Lee ◽  
Chan Kee Park ◽  
Hae-Young Park
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Coherence Tomography Angiography ◽  
Deep Layer ◽  
Plexiform Layer ◽  
Normal Tension Glaucoma ◽  
Superficial Layer ◽  
Inner Plexiform Layer ◽  
Optical Coherence ◽  
Fiber Layer ◽  
Cross Sectional

Abstract We investigated the characteristics of localized vessel density defects (VD) either in the deep or superficial vascular layer of normal-tension glaucoma patients using optical coherence tomography angiography (OCTA). In this retrospective, cross-sectional study, 74 eyes with localized retinal nerve fiber layer (RNFL) defect were included. The relationships between the widths of the VD in the superficial and deep layer and ocular factors were evaluated. Eyes with greater deep VD were significantly older (P = 0.023). Baseline and treated IOPs were significantly related to the width of the deep VD (P=0.009 and 0.014, respectively). By contrast, average ganglion cell inner plexiform layer thickness (GCIPLT) was substantially related to the width of the superficial VD (Both Ps=0.004). In logistic regression analysis, aging was noticeably associated with wider deep VD, whereas worse pattern standard deviation (PSD) had a significant association with wider superficial VD (Both Ps=0.001). In sum, while changes of the superficial layer seemed an overall ramification of glaucomatous damages, the deep layer was more likely to be affected by factors related to ocular microcirculation, such as IOPs and older age. Thus, looking into the deep vascular layer using OCTA could identify risk factors related to the disturbance in ocular microcirculation.

scholarly journals The role of pattern electroretinograms and optical coherence tomography angiography in the diagnosis of normal-tension glaucoma

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Sang Yeop Lee ◽  
Nak-Hoon Son ◽  
Hyoung Won Bae ◽  
Gong Je Seong ◽  
Chan Yun Kim
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Coherence Tomography Angiography ◽  
Early Stage ◽  
Pattern Electroretinogram ◽  
Normal Tension Glaucoma ◽  
Optical Coherence ◽  
Early Glaucoma ◽  
Normal Individuals ◽  
Auc Value ◽  
Glaucoma Group

AbstractIn this study, we investigated the correlation between pattern electroretinogram (PERG) and optical coherence tomography angiography (OCTA) parameters for diagnosis in patients with normal-tension glaucoma (NTG). Forty-nine normal individuals (49 eyes) and 60 patients with NTG (60 eyes) were enrolled. OCTA and PERG parameters, such as macular vessel density (VD) and the amplitude of N35–P50 and P50–N95, were measured. Correlation analyses were performed between the parameters, and the area under the curve (AUC) was used to identify their diagnostic ability for NTG. Macular VD and the amplitude of N35–P50 and P50–N95 showed significant differences between the normal individuals and patients with NTG. Correlation between P50 and N95 amplitude and macular VD was significant in the normal and early glaucoma groups. Macular VD showed a higher AUC value (0.730) than that of P50–N95 amplitude (0.645) in the early glaucoma group. In the moderate to severe glaucoma group, the AUC value of the amplitude of P50–N95 (0.907) was higher than that of macular VD (0.876). The results indicate that PERG and OCTA parameters may identify glaucoma in its early stage, based on the severity of glaucomatous damage in patients with NTG.

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