Measurement of vessel width on fundus photographs

1979 ◽  
Vol 211 (1) ◽  
pp. 35-48 ◽  
Author(s):  
D. Bracher ◽  
M. Dozzi ◽  
W. Lotmar
Keyword(s):  
Fundus Photographs ◽  
Vessel Width

scholarly journals Accurate vessel width measurement from fundus photographs: a new concept.

1994 ◽  
Vol 78 (1) ◽  
pp. 24-29 ◽  
Author(s):  
S M Rassam ◽  
V Patel ◽  
O Brinchmann-Hansen ◽  
O Engvold ◽  
E M Kohner
Keyword(s):  
Width Measurement ◽  
Fundus Photographs ◽  
Vessel Width

Retinal blood vessel width measured on color fundus photographs by image analysis

2009 ◽  
Vol 73 (S215) ◽  
pp. 33-40 ◽  
Author(s):  
Da-Ching Wu ◽  
Bernard Schwartz ◽  
Joan Schwoerer ◽  
Ramnik Banwatt
Keyword(s):  
Image Analysis ◽  
Blood Vessel ◽  
Retinal Blood Vessel ◽  
Fundus Photographs ◽  
Vessel Width

scholarly journals Acute Zonal Occult Outer Retinopathy: Vision Loss in an Active Duty Soldier

2013 ◽  
Vol 2013 ◽  
pp. 1-5
Author(s):  
Courtney M. Crawford ◽  
Bruce A. Rivers ◽  
Mark Nelson
Keyword(s):  
Visual Field ◽  
Visual Field Defect ◽  
Vision Loss ◽  
Fundus Autofluorescence ◽  
Final Diagnosis ◽  
Active Duty ◽  
Visual Field Defects ◽  
Fundus Photographs ◽  
Optical Coherence Tomograph ◽  
Field Defect

Objective. To describe a case of acute zonal occult outer retinopathy (AZOOR) in an active duty patient.Methods. In this paper we studied fundus photographs, optical coherence tomograph, Humphrey visual field 30-2, fundus autofluorescence images, fluorescein angiograms, and electroretinography.Results. Exam findings on presentation: a 34-year-old American Indian female presented with bilateral photopsias, early RPE irregularity, and an early temporal visual field defect. Progression RPE damage and visual field defect along with ERG findings support final diagnosis of AZOOR.Conclusion. AZOOR may initially be identified as a broader category of disease called the “AZOOR complex of disorders”. Specific visual field defects, ERG results, and clinical exam findings will help distinguish AZOOR from other similar disorders.

scholarly journals Diabetic maculopathy: multicolour and SD-OCT versus fundus photography

2021 ◽  
Vol 6 (1) ◽  
pp. e000514
Author(s):  
Obaid Kousha ◽  
Martina Maria Delle Fave ◽  
Mariano Cozzi ◽  
Elisa Carini ◽  
Sergio Pagliarini
Keyword(s):  
Macular Oedema ◽  
Cross Sectional Study ◽  
Fundus Photography ◽  
Diabetic Maculopathy ◽  
Perfect Agreement ◽  
Cross Sectional ◽  
Clinically Significant ◽  
Fundus Photographs ◽  
Diabetic Eye Screening ◽  
Sd Oct

ObjectiveThe English Diabetic Eye Screening (DES) programme recommends patients with M1 diabetic maculopathy to be referred to hospital eye services. DES uses flash fundus photography as the reference standard for maculopathy grading. We compared multicolour versus non-stereoscopic fundus photography at identifying M1 maculopathy, with spectral domain optical coherence tomography (SD-OCT) identifying macular thickening.Methods and analysisThis cross-sectional study included 345 patients with R1M1 referred from DES and reviewed in secondary care with fundus photographs, multicolour and SD-OCT. Maculopathy was graded based on DES exudate criteria on both multicolour and fundus photography in a blind fashion by two independent graders. Macular thickness was ascertained on SD-OCT.ResultsIntergrader agreement on grading maculopathy using fundus photography (Cohen’s κ=0.91) and multicolour (Cohen’s κ=0.82) was ‘almost perfect’. Agreement between fundus photography and multicolour on grading maculopathy (Cohen’s κ=0.76) was ‘substantial’. Compared with fundus photography, multicolour had sensitivity of 87% (95% CI 81% to 93%) and specificity of 90% (95% CI 87% to 94%) in detecting M1 maculopathy. SD-OCT identified 84 eyes with macular thickening, 47 of which were graded as M0 by fundus photography. 5 eyes with exudates and severe macular oedema requiring urgent intervention were also missed on fundus photography but not on multicolour. Multicolour, when complemented by SD-OCT, did not miss any clinically significant macular oedema.ConclusionMulticolour integrates synergistically in a single platform with SD-OCT providing effective monitoring of M1 diabetic maculopathy. The need for fundus photography is eliminated by multicolour/SD-OCT in dedicated R1M1 virtual clinics not requiring parallel diabetic retinopathy grading.

Retinal vascular geometry detection as a biomarker in diabetes mellitus

2021 ◽  
pp. 112067212110334
Author(s):  
Meng Li ◽  
Gengyuan Wang ◽  
Honghui Xia ◽  
Ziqing Feng ◽  
Peng Xiao ◽  
...  
Keyword(s):  
Diabetes Mellitus ◽  
Regression Analysis ◽  
Healthy Subjects ◽  
Morphological Changes ◽  
Vessel Diameter ◽  
Parameter Analysis ◽  
Generative Adversarial Network ◽  
Vascular Geometry ◽  
Fundus Photographs ◽  
Retinal Vascular Geometry

Objective: To compare the vessel geometry characteristics of color fundus photographs in normal control and diabetes mellitus (DM) patients and to find potential biomarkers for early diabetic retinopathy (DR) based on a neural network vessel segmentation system and automated vascular geometry parameter analysis software. Methods: A total of 102 consecutive patients with type 2 DM (T2DM) and 132 healthy controls were recruited. All participants underwent general ophthalmic examinations, and retinal fundus photographs were taken with a digital fundus camera without mydriasis. Color fundus photographs were input into a dense-block generative adversarial network (D-GAN)-assisted retinal vascular segmentation system ( http://www.gdcerc.cn:8081/#/login ) to obtain binary images. These images were then analyzed by customized software (ocular microvascular analysis system V2.9.1) for automatic processing of vessel geometry parameters, including the monofractal dimension ( Dbox), multifractal dimension ( D0), vessel area ratio ( R), max vessel diameter ( dmax), average vessel diameter ( dave), arc–chord ratio (A/C), and tortuosity (τn). Geometric differences between the healthy subjects and DM patients were analyzed. Then, regression analysis and receiver operating characteristic (ROC) curve analysis were performed to evaluate the diagnostic efficiency of the vascular geometry parameters. Results: No significant differences were observed between the baseline characteristics of each group. DM patients had lower Dbox and D0 values (1.330 ± 0.041; 1.347 ± 0.038) than healthy subjects (1.343 ± 0.048, p < 0.05; 1.362 ± 0.042, p < 0.05) and showed increasing values of dmax, dave, A/C, and τn compared with normal controls, although only the differences in dave and τn between the groups were statistically significant. In the regression analysis, dave and τn showed a good correlation with diabetes ( dave, OR 1.765, 95% CI 1.319–2.362, p < 0.001; τn, OR 9.323, 95% CI 1.492–58.262, p < 0.05). Conclusions: We demonstrated the relationship between retinal vascular geometry and the process in DM patients, showing that Dbox, D0, dave, and τn may be indicators of morphological changes in retinal vessels in DM patients and can be early biomarkers of DR.

scholarly journals Prevalence of Epiretinal Membrane among Subjects in a Health Examination Program in Japan

Life ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 93
Author(s):  
Hiroshi Shimizu ◽  
Ryo Asaoka ◽  
Takashi Omoto ◽  
Yuri Fujino ◽  
Shingo Mitaki ◽  
...  
Keyword(s):  
Epiretinal Membrane ◽  
Multivariate Analyses ◽  
Multiple Logistic Regression Analysis ◽  
Body Height ◽  
Older Age ◽  
Health Examination ◽  
Multiple Logistic Regression ◽  
Older Subjects ◽  
Fundus Photographs ◽  
Univariate Analyses

The prevalence of an epiretinal membrane (ERM) was elucidated using a dataset from a health examination program database in Japan. From the cohort database, 5042 eyes of 2552 subjects were included. The presence of an ERM, cellophane macular reflex (CMR), or preretinal macular fibrosis (PMF) was detected using color fundus photographs, and crude and age-standardized prevalence were obtained. To further assess the possible risk factors of ERM, background parameters were compared between ERM+ and − groups, and multiple logistic regression analysis was performed. ERM was detected in fundus photographs of 275 eyes (eye-based prevalence of 5.5%) from 217 subjects (subject-based prevalence of 8.5%). CMR was detected in 169 eyes (3.4%) of 138 subjects (5.4%), and PMF was detected in 106 eyes (2.1%) of 97 subjects (3.8%). By univariate analyses, compared with ERM− eyes or subjects, higher Scheie’s H grade (p < 0.0001), S grade (p < 0.0001), and glaucoma prevalence (p = 0.0440) were found in ERM+ eyes, and older age (p < 0.0001), more frequent histories of hypertension (p = 0.0033) and hyperlipidemia (p = 0.0441), and more frequent uses of medication for hypertension (p = 0.0034) and hyperlipidemia (p = 0.0074), shorter body height (p = 0.0122), and higher systolic blood pressure (p = 0.0078), and thicker intimal medial thickness (p = 0.0318) were found in ERM+ subjects. By multivariate analyses, older age (p < 0.0001, estimate = 0.05/year) was the only significant factor of ERM prevalence. Age-standardized prevalence of ERM was calculated to be 2.4%, 6.7%, and 13.3% for all ages, subjects older than 40 years, and subjects older than 65 years, respectively. We reported the prevalence of ERM and its subclasses in Japanese subjects. Since its prevalence is remarkably high in older subjects, an ERM can be seen as an important cause of visual impairment in Japan and in areas of the world where individuals live to an advanced age.

Computerized Analysis of Retinal Vessel Width and Tortuosity in Premature Infants

2008 ◽  
Vol 49 (8) ◽  
pp. 3577 ◽  
Author(s):  
Clare M. Wilson ◽  
Kenneth D. Cocker ◽  
Merrick J. Moseley ◽  
Carl Paterson ◽  
Simon T. Clay ◽  
...  
Keyword(s):  
Premature Infants ◽  
Retinal Vessel ◽  
Computerized Analysis ◽  
Vessel Width

scholarly journals Detailed Morphological Changes of Foveoschisis in Patient with X-Linked Retinoschisis Detected by SD-OCT and Adaptive Optics Fundus Camera

2015 ◽  
Vol 2015 ◽  
pp. 1-8
Author(s):  
Keiichiro Akeo ◽  
Shuhei Kameya ◽  
Kiyoko Gocho ◽  
Daiki Kubota ◽  
Kunihiko Yamaki ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Morphological Changes ◽  
Fundus Photography ◽  
Foveal Thickness ◽  
Functional Changes ◽  
Fundus Camera ◽  
Fundus Photographs ◽  
Topical Dorzolamide ◽  
Retinal Folds ◽  
Sd Oct

Purpose. To report the morphological and functional changes associated with a regression of foveoschisis in a patient with X-linked retinoschisis (XLRS).Methods. A 42-year-old man with XLRS underwent genetic analysis and detailed ophthalmic examinations. Functional assessments included best-corrected visual acuity (BCVA), full-field electroretinograms (ERGs), and multifocal ERGs (mfERGs). Morphological assessments included fundus photography, spectral-domain optical coherence tomography (SD-OCT), and adaptive optics (AO) fundus imaging. After the baseline clinical data were obtained, topical dorzolamide was applied to the patient. The patient was followed for 24 months.Results. A reportedRS1gene mutation was found (P203L) in the patient. At the baseline, his decimal BCVA was 0.15 in the right and 0.3 in the left eye. Fundus photographs showed bilateral spoke wheel-appearing maculopathy. SD-OCT confirmed the foveoschisis in the left eye. The AO images of the left eye showed spoke wheel retinal folds, and the folds were thinner than those in fundus photographs. During the follow-up period, the foveal thickness in the SD-OCT images and the number of retinal folds in the AO images were reduced.Conclusions. We have presented the detailed morphological changes of foveoschisis in a patient with XLRS detected by SD-OCT and AO fundus camera. However, the findings do not indicate whether the changes were influenced by topical dorzolamide or the natural history.

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