scholarly journals Enlarged Foveal Avascular Zone after Whiplash Injury-Acquired Berlin’s Edema

2020 ◽  
Vol 11 (2) ◽  
pp. 395-401
Author(s):  
Nataša Drača ◽  
Branimir Cerovski ◽  
Ratimir Lazić ◽  
Damir Kovačević ◽  
Krešimir Gabrić ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Visual Field ◽  
Whiplash Injury ◽  
Optical Coherence Tomography Angiography ◽  
Foveal Avascular Zone ◽  
Central Scotoma ◽  
Visual Field Examination ◽  
Patient Reported ◽  
Avascular Zone

We describe a case of optical coherence tomography angiography (OCTA) changes in the foveal avascular zone (FAZ) in a patient that had suffered Berlin’s edema after a whiplash neck injury. The patient reported central scotoma throughout the 1-year follow-up, confirmed by visual field examination. OCTA showed FAZ enlargement of the left eye as compared to the healthy right eye in the superficial capillary layer and even more in the deep capillary layer. To the best of our knowledge, FAZ enlargement has not been previously described by OCTA after whiplash-related macular injury.

Association of Foveal Avascular Zone Enlargement and Diabetic Retinopathy Progression Using Optical Coherence Tomography Angiography

2018 ◽  
Vol 2 (6) ◽  
pp. 343-350
Author(s):  
Katsuya Suzuki ◽  
Miho Nozaki ◽  
Noriaki Takase ◽  
Aki Kato ◽  
Hiroshi Morita ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Diabetic Retinopathy ◽  
Optical Coherence Tomography Angiography ◽  
Retrospective Chart Review ◽  
Foveal Avascular Zone ◽  
Diabetic Patients ◽  
Optical Coherence ◽  
Avascular Zone ◽  
Capillary Plexus

Purpose: The purpose of this article is to evaluate long-term change of the foveal avascular zone (FAZ) area in diabetic eyes using optical coherence tomography angiography (OCTA) (AngioVue, Avanti OCT, Optovue). Methods: A retrospective chart review was conducted of patients who had undergone OCTA fundus examinations with at least 12 months of follow-up. Eyes with previous laser photocoagulation and antivascular endothelial growth factor treatments were excluded. ImageJ software was used to evaluate the FAZ area in the superficial capillary plexus (SCP) and deep capillary plexus (DCP). Results: Forty eyes were analyzed in this study and divided into 3 groups: healthy controls (13 eyes), diabetic patients without diabetic retinopathy (DR) (14 eyes), and diabetic patients with DR (13 eyes). During the 22 months of follow-up, the FAZ area of eyes with DR in the DCP enlarged from 0.64 ± 0.20 mm2 to 0.70 ± 0.20 mm2 ( P = .021), which was a 10.1% increase from baseline (5.1% per year). No significant changes were observed during the study period for FAZ areas in the DCP of controls and diabetic patients without DR. Enlargement of FAZ in the DCP was significantly greater in eyes with DR progression vs those without progression (19.2% and 1.2%, respectively, P = .013). Conclusions: Our data suggest FAZ enlargement in the DCP is associated with DR progression. Assessment of the FAZ by OCTA might be useful for the evaluation of microcirculation abnormalities in DR and the onset of DR progression.

Foveal avascular zone in oculocutaneous albinism

2021 ◽  
Vol 14 (5) ◽  
pp. e240208
Author(s):  
Hana A Mansour ◽  
Sami Uwaydat ◽  
Muhamad H Yunis ◽  
Ahmad M Mansour
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Coherence Tomography Angiography ◽  
Oculocutaneous Albinism ◽  
Foveal Avascular Zone ◽  
Optical Coherence ◽  
Retinal Capillary ◽  
Avascular Zone ◽  
Capillary Plexus ◽  
Foveal Hypoplasia

Optical coherence tomography angiography imaging in two patients with oculocutaneous albinism, one with severe nystagmus, showed persistence of both the superficial and the deep retinal capillary plexus adding another vascular feature to the foveal hypoplasia.

scholarly journals Automatic segmentation of foveal avascular zone based on adaptive watershed algorithm in retinal optical coherence tomography angiography images

2021 ◽  
Author(s):  
Jian Liu ◽  
Shixin Yan ◽  
Nan Lu ◽  
Dongni Yang ◽  
Chunhui Fan ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Healthy Subjects ◽  
Optical Coherence Tomography Angiography ◽  
Automatic Segmentation ◽  
Qualitative Evaluation ◽  
Foveal Avascular Zone ◽  
Watershed Algorithm ◽  
Strong Positive Correlation ◽  
Optical Coherence ◽  
Avascular Zone

The size and shape of the foveal avascular zone (FAZ) have a strong positive correlation with several vision-threatening retinovascular diseases. The identification, segmentation and analysis of FAZ are of great significance to clinical diagnosis and treatment. We presented an adaptive watershed algorithm to automatically extract FAZ from retinal optical coherence tomography angiography (OCTA) images. For the traditional watershed algorithm, “over-segmentation” is the most common problem. FAZ is often incorrectly divided into multiple regions by redundant “dams”. This paper analyzed the relationship between the “dams” length and the maximum inscribed circle radius of FAZ, and proposed an adaptive watershed algorithm to solve the problem of “over-segmentation”. Here, 132 healthy retinal images and 50 diabetic retinopathy (DR) images were used to verify the accuracy and stability of the algorithm. Three ophthalmologists were invited to make quantitative and qualitative evaluations on the segmentation results of this algorithm. The quantitative evaluation results show that the correlation coefficients between the automatic and manual segmentation results are 0.945 (in healthy subjects) and 0.927 (in DR patients), respectively. For qualitative evaluation, the percentages of “perfect segmentation” (score of 3) and “good segmentation” (score of 2) are 99.4% (in healthy subjects) and 98.7% (in DR patients), respectively. This work promotes the application of watershed algorithm in FAZ segmentation, making it a useful tool for analyzing and diagnosing eye diseases.

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