A Software System for Grading Diabetic Retinopathy by Analyzing Retinal Images

2013 ◽  
pp. 176-193
Author(s):  
M. Usman Akram ◽  
Shehzad Khalid
Keyword(s):  
Diabetic Retinopathy ◽  
Retinal Image ◽  
Eye Disease ◽  
Diabetic Patients ◽  
Hard Exudates ◽  
Cotton Wool Spots ◽  
Total Blindness ◽  
Novel Algorithms ◽  
Main Component ◽  
Aided Diagnosis

Medical imaging is very popular and is vital in designing Computer-Aided Diagnosis (CAD) for various diseases such as tumor detection using MRI. Diabetic retinopathy is an eye disease that is caused by the increase of insulin in blood in diabetic patients. It can cause total blindness if not detected and treated in time. The disease affects human retina and shows different signs on retinal surface as time passes. In this chapter, the authors present a software based on novel algorithms for early detection of diabetic retinopathy. It detects dark (Microaneurysms, Haemorrhages) and bright (hard exudates, cotton wool spots) lesions from retinal image. The algorithms consist of retinal image preprocessing, main component extraction, detection of candidate lesions, feature extraction, and finally classification using modified m-mediods based classifier. The proposed system is evaluated using publicly available retinal image databases, and results demonstrate the validity of proposed system.

Prevalence of Dry Eye Disease in Type 2 Diabetic Patients and its Association with Diabetic Retinopathy

2021 ◽  
Vol 15 (11) ◽  
pp. 3269-3272
Author(s):  
Darikta Dargahi Shaikh ◽  
Tehmina Imdad ◽  
Safdar Ali ◽  
Fayaz Ali Kalhoro ◽  
Sajida Parveen Shaikh ◽  
...  
Keyword(s):  
Type 2 Diabetes ◽  
Diabetic Retinopathy ◽  
Dry Eye ◽  
Dry Eye Disease ◽  
Eye Disease ◽  
Diabetic Patients ◽  
Type 2 Diabetic Patients ◽  
Department Of Ophthalmology ◽  
Type 2 Diabetic

Objective: To determine the prevalence of dry eye disease in type 2 diabetic patients and its correlation with retinopathy Materials and Methods: A cross-sectional study was conducted in the Department of Ophthalmology, Chandka Medical College & Shaheed Mohtarma Benazir Bhutto Medical University Larkana, from 1st April 2021 to 30th September 2021. Consecutive 100 patients with type 2 diabetes mellitus (DM) who attended outpatient department were included as per inclusion-exclusion criteria. Results: The patients were mostly female (58%) with a female-to-male ratio of 1.38:1. Most patients (43%) were under 50, followed by 51–60. (34 %). The overall mean age was 54.26 10.06. More than half (63%) of patients had diabetes for up to 5 years. The patients had a 42 percent frequency of DES. Mild, moderate, and severe dry eye were diagnosed in 21%, 16%, and 5% of individuals. Longevity and poor diabetes control exacerbated the disease. Conclusions: Type 2 DM patients' age, but not their gender, was found to be a significant predictor of DES. Dry eye was found to be more common among diabetics with poor control of their condition. In patients with type 2 diabetes, the age, but not the gender, was substantially linked to DES. Keywords: Type 2 diabetes, Dry eye disease, Diabetic retinopathy, Meibomian gland dysfunction.

scholarly journals Computer Aided Diagnosis of Eye Disease for Diabetic Retinopathy

2019 ◽  
Vol 1372 ◽  
pp. 012030
Author(s):  
Wei Sheng Ng ◽  
Wan Mahani Hafizah Wan Mahmud ◽  
Audrey Kah Ching Huong ◽  
Wan Nur Hafsha Wan Kairuddin ◽  
Hong Seng Gan ◽  
...  
Keyword(s):  
Diabetic Retinopathy ◽  
Computer Aided Diagnosis ◽  
Eye Disease ◽  
Computer Aided ◽  
Aided Diagnosis

scholarly journals Effective Fundus Image Decomposition for the Detection of Red Lesions and Hard Exudates to Aid in the Diagnosis of Diabetic Retinopathy

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6549
Author(s):  
Roberto Romero-Oraá ◽  
María García ◽  
Javier Oraá-Pérez ◽  
María I. López-Gálvez ◽  
Roberto Hornero
Keyword(s):  
Diabetic Retinopathy ◽  
Lesion Detection ◽  
Computer Assisted ◽  
Diabetic Patients ◽  
Fundus Image ◽  
Public Database ◽  
Diagnostic Systems ◽  
Hard Exudates ◽  
The Public ◽  
Proprietary Database

Diabetic retinopathy (DR) is characterized by the presence of red lesions (RLs), such as microaneurysms and hemorrhages, and bright lesions, such as exudates (EXs). Early DR diagnosis is paramount to prevent serious sight damage. Computer-assisted diagnostic systems are based on the detection of those lesions through the analysis of fundus images. In this paper, a novel method is proposed for the automatic detection of RLs and EXs. As the main contribution, the fundus image was decomposed into various layers, including the lesion candidates, the reflective features of the retina, and the choroidal vasculature visible in tigroid retinas. We used a proprietary database containing 564 images, randomly divided into a training set and a test set, and the public database DiaretDB1 to verify the robustness of the algorithm. Lesion detection results were computed per pixel and per image. Using the proprietary database, 88.34% per-image accuracy (ACCi), 91.07% per-pixel positive predictive value (PPVp), and 85.25% per-pixel sensitivity (SEp) were reached for the detection of RLs. Using the public database, 90.16% ACCi, 96.26% PPV_p, and 84.79% SEp were obtained. As for the detection of EXs, 95.41% ACCi, 96.01% PPV_p, and 89.42% SE_p were reached with the proprietary database. Using the public database, 91.80% ACCi, 98.59% PPVp, and 91.65% SEp were obtained. The proposed method could be useful to aid in the diagnosis of DR, reducing the workload of specialists and improving the attention to diabetic patients.

scholarly journals Angiopoietin-like 4 is a potent angiogenic factor and a novel therapeutic target for patients with proliferative diabetic retinopathy

2015 ◽  
Vol 112 (23) ◽  
pp. E3030-E3039 ◽  
Author(s):  
Savalan Babapoor-Farrokhran ◽  
Kathleen Jee ◽  
Brooks Puchner ◽  
Syed Junaid Hassan ◽  
Xiaoban Xin ◽  
...  
Keyword(s):  
Diabetic Retinopathy ◽  
Proliferative Diabetic Retinopathy ◽  
Müller Cells ◽  
Aqueous Fluid ◽  
Angiogenic Factor ◽  
Eye Disease ◽  
Diabetic Patients ◽  
Muller Cells ◽  
Angiogenic Potential ◽  
Diabetic Eye Disease

Diabetic eye disease is the most common cause of severe vision loss in the working-age population in the developed world, and proliferative diabetic retinopathy (PDR) is its most vision-threatening sequela. In PDR, retinal ischemia leads to the up-regulation of angiogenic factors that promote neovascularization. Therapies targeting vascular endothelial growth factor (VEGF) delay the development of neovascularization in some, but not all, diabetic patients, implicating additional factor(s) in PDR pathogenesis. Here we demonstrate that the angiogenic potential of aqueous fluid from PDR patients is independent of VEGF concentration, providing an opportunity to evaluate the contribution of other angiogenic factor(s) to PDR development. We identify angiopoietin-like 4 (ANGPTL4) as a potent angiogenic factor whose expression is up-regulated in hypoxic retinal Müller cells in vitro and the ischemic retina in vivo. Expression of ANGPTL4 was increased in the aqueous and vitreous of PDR patients, independent of VEGF levels, correlated with the presence of diabetic eye disease, and localized to areas of retinal neovascularization. Inhibition of ANGPTL4 expression reduced the angiogenic potential of hypoxic Müller cells; this effect was additive with inhibition of VEGF expression. An ANGPTL4 neutralizing antibody inhibited the angiogenic effect of aqueous fluid from PDR patients, including samples from patients with low VEGF levels or receiving anti-VEGF therapy. Collectively, our results suggest that targeting both ANGPTL4 and VEGF may be necessary for effective treatment or prevention of PDR and provide the foundation for studies evaluating aqueous ANGPTL4 as a biomarker to help guide individualized therapy for diabetic eye disease.

scholarly journals Knowledge about Diabetic Retinopathy, Eye Check-up Practice and Associated Factors among Adult Patients with Diabetes Mellitus Attending at Debark Hospital, Northwest Ethiopia

2020 ◽  
Author(s):  
Abel Sinshaw Assem ◽  
Mebratu Muusew Tegegne ◽  
Destaye Shiferaw Alemu ◽  
Asamere Tsegaw Woredekal ◽  
Tsehay Kassa Tefera
Keyword(s):  
Diabetes Mellitus ◽  
Diabetic Retinopathy ◽  
Northwest Ethiopia ◽  
Good Knowledge ◽  
Eye Disease ◽  
Diabetic Patients ◽  
Duration Of Diabetes ◽  
Patients With Diabetes ◽  
History Of ◽  
Eye Examination

Abstract Background: Routine eye examination plays a vital role in detecting diabetic retinopathy in its earliest stage before the onset of blindness. Patients’ knowledge about the nature and the consequences of diabetic retinopathy and routine eye checkup helps for timely identification and early treatment. However, there is limited evidence on knowledge of patients with diabetes mellitus on diabetic retinopathy and their eye check-up practices in Ethiopia. The aim of this study was to assess knowledge about diabetic retinopathy, eye check-up practice and associated factors of diabetic retinopathy among adult diabetic patients at Debark hospital, Northwest Ethiopia. Methods: Institution based cross-sectional study was conducted at Debark hospital, Northwest Ethiopia, from April 20/2018- May 20/2018. A pretested interviewer administered structured questionnaire was used to collect data among 230 diabetic patients aged 18 years and above. Data were entered in to Epi Info version 7 and exported to SPSS version 20 for analysis. Bivariable and multivariable binary logistic regression analyses were done. Odds ratio with 95% confidence level was determined and variables with p–value of < 0.05 were considered as statistically significant. Result: Out of 238 sample 230 were participated, among this, 119 (51.7%) were males. The mean age of the respondents was 49 (SD ±17.6) years. One hundred nine (47.4%) participants had good knowledge and 91 (39.6%) had good eye check-up practice. Urban residence [AOR= 2.65;95% CI: 1.16-6.07)]), monthly income of 3501-8000 birr [AOR=4.54;(1.31-15.7)], type II diabetes mellitus [AOR=3.9;(1.6-9.6)], duration of diabetes (6-12 years[AOR=4.4;(1.4-13.5)]), history of eye disease [AOR=5.5;(2.3-13.0)] were associated with good knowledge. Similarly, longer duration of diabetes (13-25 years [AOR=3.77; (1.05-13.5)]) and history of eye disease [AOR=2.47; (1.09-5.62)] were associated with good eye check-up practice. Conclusion: The proportion of good knowledge about diabetic retinopathy among diabetic patients at Debark hospital was fair (47.4%) and good eye check-up practice (eye examination at least once in the past year) was low (39.6%). Longer duration of diabetes and history of eye disease were identified as positive factors for good knowledge and eye check-up practice. Knowledge and regular eye check-up practice needs to be enhanced through provision of appropriate health education.

scholarly journals A 15 Month Experience with a Primary Care-based Telemedicine Screening Program for Diabetic Retinopathy.

2020 ◽  
Author(s):  
James Benjamin ◽  
Justin Sun ◽  
Devon Cohen ◽  
Joseph Matz ◽  
Angela Barbera ◽  
...  
Keyword(s):  
Primary Care ◽  
Diabetic Retinopathy ◽  
Screening Program ◽  
Primary Care Clinic ◽  
University Hospital ◽  
Eye Disease ◽  
Diabetic Patients ◽  
Close Monitoring ◽  
Care Clinic ◽  
Retinal Screening

Abstract Background: Using telemedicine for diabetic retinal screening is becoming popular especially amongst at-risk urban communities with poor access to care. The goal of the diabetic telemedicine project at Temple University Hospital is to improve cost-effective access to appropriate retinal care to those in need of close monitoring and/or treatment.Methods: This will be a retrospective review of 15 months of data from March 2016 to May 2017. We will investigate how many patients were screened, how interpretable the photographs were, how often the photographs generated a diagnosis of diabetic retinopathy (DR) based on the screening photo, and how many patients followed-up for an exam in the office, if indicated.Results: Six-hundred eighty-nine (689) digital retinal screening exams on 1377 eyes of diabetic patients were conducted in Temple’s primary care clinic. The majority of the photographs were read to have no retinopathy (755, 54.8%). Among all of the screening exams, 357 (51.8%) triggered a request for a referral to ophthalmology. Four-hundred forty-nine (449, 32.6%) of the photos were felt to be uninterpretable by the clinician. Referrals were meant to be requested for DR found in one or both eyes, inability to assess presence of retinopathy in one or both eyes, or for suspicion of a different ophthalmic diagnosis. Sixty-seven patients (9.7%) were suspected to have another ophthalmic condition based on other findings in the retinal photographs. Among the 34 patients that were successfully completed a referral visit to Temple ophthalmology, there was good concordance between the level of DR detected by their screening fundus photographs and visit diagnosis.Conclusions: Although a little more than half of the patients did not have diabetic eye disease, about half needed a referral to ophthalmology. However, only 9.5% of the referral-warranted exams actually received an eye exam. Mere identification of referral-warranted diabetic retinopathy or other eye disease is not enough. A successful telemedicine screening program must close the communication gap between screening and diagnosis by reviewer to provide timely follow-up by eye care specialists.

scholarly journals Knowledge about diabetic retinopathy, eye check-up practice and associated factors among patients with diabetes mellitus attending Debark hospital, northwest Ethiopia

2019 ◽  
Author(s):  
Mebratu Muusew Tegegne ◽  
Abel Sinshaw Assem ◽  
Destaye Shiferaw Alemu ◽  
Asamere Tsegaw Woredekal ◽  
Tsehay Kassa Alemu
Keyword(s):  
Diabetes Mellitus ◽  
Diabetic Retinopathy ◽  
Associated Factors ◽  
Northwest Ethiopia ◽  
Good Knowledge ◽  
Eye Disease ◽  
Diabetic Patients ◽  
Duration Of Diabetes ◽  
Patients With Diabetes ◽  
History Of

Abstract Background: Routine eye examination plays a vital role in detecting diabetic retinopathy in its earliest stage before the onset of blindness. Patients’ knowledge about the nature and the consequences of diabetic retinopathy and routine eye checkup helps in timely identification and early treatment. However, there is limited evidence on knowledge of patients with diabetes mellitus on diabetic retinopathy and their eye check-up practices in Ethiopia in general and the study area in particular. Purpose: The aim of this study was to assess knowledge, eye check-up practice and associated factors of diabetic retinopathy among diabetic patients at Debark hospital, Northwest Ethiopia. Materials and Methods: Institution based cross – sectional study was conducted at Debark hospital, Northwest Ethiopia, from April 20/2018- May 20/2018. A pretested interviewer administered structured questionnaire was used to collect data among 230 diabetic patients aged 18 years and above. Data were entered in to Epi Info version 7 and exported to SPSS version 20 for analysis. Bivariable and multivariable binary logistic regression analyses were done. Odds ratio with 95% confidence level was determined and variables with p–value of < 0.05 were considered as statistically significant. Result: Out of 238 sample 230 were participated, among this, 119 (51.7%) were males. The mean age of the respondents was 49 (SD ±17.6) years. One hundred nine (47.4%) participants had good knowledge and 91 (39.6%) had good eye check-up practice. Urban residence [AOR= 2.65;95% CI: 1.16-6.07)]), monthly income of 3501-8000 birr [AOR=4.54;(1.31-15.7)], type II diabetes mellitus [AOR=3.9;(1.6-9.6)], duration of diabetes (6-12 years[AOR=4.4;(1.4-13.5)]), history of eye disease [AOR=5.5;(2.3-13.0)] were associated with good knowledge. Similarly, longer duration of diabetes (13-25 years [AOR=3.77; (1.05-13.5)]) and history of eye disease [AOR=2.47;(1.09-5.62)] were associated with good eye check-up practice. Conclusion: The proportion of good knowledge about diabetic retinopathy among diabetic patients was fair (47.4%) in the study setting and good eye check-up practice was low (39.6%) Longer duration of diabetes and history of eye disease were identified as positive factors for good knowledge and eye check-up practice. Knowledge and regular eye check-up practice needs to be enhanced through provision of appropriate health education.

scholarly journals Knowledge About Diabetic Retinopathy, Eye Check-Up Practice And Associated Factors Among Adult Patients With Diabetes Mellitus Attending At Debark Hospital, Northwest Ethiopia

2020 ◽  
Author(s):  
Mebratu Muusew Tegegne ◽  
Abel Sinshaw Assem ◽  
Destaye Shiferaw Alemu ◽  
Asamere Tsegaw Woredekal ◽  
Tsehay Kassa Tefera
Keyword(s):  
Diabetes Mellitus ◽  
Diabetic Retinopathy ◽  
Northwest Ethiopia ◽  
Good Knowledge ◽  
Eye Disease ◽  
Diabetic Patients ◽  
Duration Of Diabetes ◽  
Patients With Diabetes ◽  
History Of ◽  
Eye Examination

Abstract Background:Routine eye examination plays a vital role in detecting diabetic retinopathy in its earliest stage before the onset of blindness. Patients’ knowledge about the nature and the consequences of diabetic retinopathy and routine eye checkup helps in timely identification and early treatment. However, there is limited evidence on knowledge of patients with diabetes mellitus on diabetic retinopathy and their eye check-up practices in Ethiopia.The aim of this study was to assess knowledge, eye check-up practice and associated factors of diabetic retinopathy among adult diabetic patients at Debark hospital, Northwest Ethiopia.Methods: Institution based cross – sectional study was conducted at Debark hospital, Northwest Ethiopia, from April 20/2018- May 20/2018. A pretested interviewer administered structured questionnaire was used to collect data among 230 diabetic patients aged 18 years and above. Data were entered in to Epi Info version 7 and exported to SPSS version 20 for analysis. Bivariable and multivariable binary logistic regression analyses were done. Odds ratio with 95% confidence level was determined and variables with p–value of < 0.05 were considered as statistically significant.Result: Out of 238 sample 230 were participated, among this, 119 (51.7%) were males. The mean age of the respondents was 49 (SD ±17.6) years. One hundred nine (47.4%) participants had good knowledge and 91 (39.6%) had good eye check-up practice. Urban residence [AOR= 2.65;95% CI: 1.16-6.07)]), monthly income of 3501-8000 birr [AOR=4.54;(1.31-15.7)], type II diabetes mellitus [AOR=3.9;(1.6-9.6)], duration of diabetes (6-12 years[AOR=4.4;(1.4-13.5)]), history of eye disease [AOR=5.5;(2.3-13.0)] were associated with good knowledge. Similarly, longer duration of diabetes (13-25 years [AOR=3.77; (1.05-13.5)]) and history of eye disease [AOR=2.47; (1.09-5.62)] were associated with good eye check-up practice. Conclusion: The proportion of good knowledge about diabetic retinopathy among diabetic patients at Debark hospital was fair (47.4%) and good eye check-up practice (eye examination at least once in the past year) was low (39.6%). Longer duration of diabetes and history of eye disease were identified as positive factors for good knowledge and eye check-up practice. Knowledge and regular eye check-up practice needs to be enhanced through provision of appropriate health education.

scholarly journals Pericyte Bridges in Homeostasis and Hyperglycemia

2020 ◽  
Author(s):  
Ada Admin ◽  
Bruce A. Corliss ◽  
H. Clifton Ray ◽  
Richard W. Doty ◽  
Corbin Mathews ◽  
...  
Keyword(s):  
Diabetic Retinopathy ◽  
Vascular Remodeling ◽  
Diabetic Control ◽  
Eye Disease ◽  
Diabetic Patients ◽  
Subsequent Increase ◽  
Process Formation ◽  
Retinal Microvasculature ◽  
Pericyte Loss

Diabetic retinopathy is a potentially blinding eye disease that threatens the vision of a ninth of diabetic patients. Progression of the disease has long been attributed to an initial dropout of pericytes that enwrap the retinal microvasculature. Revealed through retinal vascular digests, a subsequent increase in basement membrane bridges is observed. Using cell-specific markers, we demonstrate that pericytes rather than endothelial cells colocalize with these bridges. We show that the density of bridges transiently increases with elevation of Ang-2, PDGF-BB, and blood sugar, is rapidly reversed on a time scale of days, and often associated with a pericyte cell body located off-vessel. Cell-specific knockout of KLF4 in pericytes fully replicates this phenotype. <i>In vivo</i> imaging of limbal vessels demonstrates pericyte migration off-vessel, with rapid pericyte filopodial-like process formation between adjacent vessels. Accounting for off-vessel and on-vessel pericytes, we observe no pericyte loss relative to non-diabetic control retina. These findings reveal the possibility that pericyte perturbations in location and process formation may play a role in the development of pathological vascular remodeling in diabetic retinopathy.

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