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Topic Review
Deep Learning in Optical Coherence Tomography Angiography
Optical coherence tomography angiography (OCT-A) provides depth-resolved visualization of the retinal microvasculature without intravenous dye injection. It facilitates investigations of various retinal vascular diseases and glaucoma by assessment of qualitative and quantitative microvascular changes in the different retinal layers and radial peripapillary layer non-invasively, individually, and efficiently. Deep learning (DL), a subset of artificial intelligence (AI) based on deep neural networks, has been applied in OCT-A image analysis and achieved good performance for different tasks, such as image quality control, segmentation, and classification. DL technologies have further facilitated the potential implementation of OCT-A in eye clinics in an automated and efficient manner and enhanced its clinical values for detecting and evaluating various vascular retinopathies.
  • 869
  • 13 Feb 2023
Topic Review
Advancements in Glaucoma Diagnosis
The progress of artificial intelligence algorithms in digital image processing and automatic diagnosis studies of the eye disease glaucoma has been growing and presenting essential advances to guarantee better clinical care for the population.
  • 865
  • 14 Mar 2024
Topic Review
Cannabineyed
The word cannabineyed refers to endocannabinoid system (ECS) physiology, dysregulation and modulation in the context of ocular and periocular tissues and structures. It derives by placing the word eye into the original one, cannabinoid. Specifically, the endocannabinoid system (ECS) is a complex regulatory system, highly conserved among vertebrates. It has been widely described in nearly all human tissues. In the eye, the ECS expression has been demonstrated both in the anterior and in the posterior segment. In this context, the ECS is believed to play a pivotal role in the modulation of the local inflammatory state as well as in the regulation of tissue repair and fibrosis, neo-angiogenesis, pain perception, intraocular pressure (IOP) control and neuroprotection.
  • 863
  • 12 Feb 2021
Topic Review
Role of Microaneurysms in Diabetic Macular Edema
Microaneurysms (MAs), a characteristic feature in diabetic retinopathy (DR) and diabetic macular edema (DME), can be detected by fluorescein angiography, optical coherence tomography (OCT) and OCT angiography. These instrumental analyses demonstrated a geographic and functional association between MA and ischemic areas. MA turnover, the production and loss of MA, reflects the activity of DME and DR. Several cytokines are involved in the pathogenesis of MAs, which is characterized by pericyte loss and endothelial cell proliferation in a vascular endothelial growth factor (VEGF)-dependent or -independent manner. Ischemia and MAs localized in the deep retinal layers are characteristic of refractory DME cases. Even in the current anti-VEGF era, laser photocoagulation targeting MAs in the focal residual edema is still an effective therapeutic tool, but it is necessary to be creative in accurately identifying the location of MAs and performing highly precise and minimally invasive coagulation. MAs play a distinctive and important role in the pathogenesis of the onset, progression of DR and DME, and response to anti-VEGF treatment. Further research on MA is significant not only for understanding the pathogenesis of DME but also for improving the effectiveness of treatment.
  • 863
  • 03 Apr 2023
Topic Review
Typical and Atypical Optic Neuritis
Optic neuritis (ON) is an inflammatory condition involving the optic nerve. Several important typical and atypical ON variants are now recognized. Typical ON has a more favorable prognosis; it can be idiopathic or represent an early manifestation of demyelinating diseases, mostly multiple sclerosis (MS). The atypical spectrum includes entities such as antibody-driven ON associated with neuromyelitis optica spectrum disorder (NMOSD) and myelin oligodendrocyte glycoprotein antibody disease (MOGAD), chronic/relapsing inflammatory optic neuropathy (CRION), and sarcoidosis-associated ON. Appropriate and timely diagnosis is essential to rapidly decide on the appropriate treatment, maximize visual recovery, and minimize recurrences. 
  • 859
  • 20 Sep 2022
Topic Review
Research Trends and Hotspots of Retinal OCT
Optical coherence tomography (OCT) is a widely used technology for high-resolution and cross-sectional imaging of tissues by measuring backscattered light. The emergence of optical coherence tomography (OCT) has sparked great interest in retinal research.
  • 856
  • 28 Sep 2022
Topic Review
Mycotic Keratitis
Mycotic or fungal keratitis (FK) is a sight-threatening infection of the cornea by filamentous fungi or yeasts. 
  • 846
  • 23 Apr 2021
Topic Review
Basics of Ocular Immunology
Ocular infectious diseases are an important cause of potentially preventable vision loss and blindness. Bacteria and viruses represent the more common causes of ocular infections worldwide and can affect nearly any anatomical part of the eye.
  • 843
  • 18 Aug 2023
Topic Review
Cell Therapy, Optogenetics and Exosomes for Retinitis Pigmentosa
Retinitis pigmentosa (RP) is a hereditary disease that causes the gradual degeneration of the photoreceptor cells in the retina, starting with the rods, leading to a progressive loss of vision over time. RP is the most prevalent form of inherited retinal dystrophy, affecting over 1.5 million individuals worldwide and significantly impacting both patients and society. RP is a primary cause of visual disability and blindness in people under 60 years old, and common symptoms include nyctalopia and gradual peripheral vision loss. If left untreated, RP can ultimately lead to complete blindness.
  • 842
  • 12 May 2023
Topic Review
Retinal Ganglion Cell Structure and Function in Glaucoma
Glaucoma, a leading cause of irreversible blindness globally, primarily affects retinal ganglion cells (RGCs). Glaucoma is a multifactorial eye disease defined by the progressive degeneration of retinal ganglion cells (RGCs) and their axons, eventually leading to irreversible vision loss. It has been projected that the worldwide prevalence of individuals affected by glaucoma will experience a substantial growth of 74% between the years 2013 and 2040. Glaucoma poses significant clinical and public health challenges as one of the leading causes of blindness around the globe. While elevated intraocular pressure (IOP) remains a significant risk factor and therapeutic target for glaucoma, it is becoming increasingly apparent that other factors may play a role in the disease’s pathogenesis and progression. The structure and function of RGCs, which serve as the ultimate output neurons of the retina and transmit visual information to the brain, are among the most crucial components being studied.
  • 841
  • 21 Dec 2023
Topic Review
Inherited Retinal Dystrophies
Inherited retinal dystrophies (IRDs) are a group of retinal disorders that cause progressive and severe loss of vision because of retinal cell death, mainly photoreceptor cells. IRDs include retinitis pigmentosa (RP), the most common IRD. IRDs present a genetic and clinical heterogeneity that makes it difficult to achieve proper treatment. The progression of IRDs is influenced, among other factors, by the activation of the immune cells (microglia, macrophages, etc.) and the release of inflammatory molecules such as chemokines and cytokines. Upregulation of tumor necrosis factor alpha (TNFα), a pro-inflammatory cytokine, is found in IRDs. This cytokine may influence photoreceptor cell death. Different cell death mechanisms are proposed, including apoptosis, necroptosis, pyroptosis, autophagy, excessive activation of calpains, or parthanatos for photoreceptor cell death. Some of these cell death mechanisms are linked to TNFα upregulation and inflammation. Therapeutic approaches that reduce retinal inflammation have emerged as useful therapies for slowing down the progression of IRDs.
  • 838
  • 22 Sep 2021
Topic Review
Myopia, Sodium Chloride, and Vitreous Fluid Imbalance
Myopia prevalence is low in native people consuming traditional diets lacking in sodium chloride, and nutritional epidemiological evidence supports the association of rising myopia prevalence with dietary sodium intake. East Asian populations have among the highest rates of myopia associated with high dietary sodium. Similar associations of sodium and rising myopia prevalence were observed in the United States in the late 20th century.
  • 838
  • 12 Mar 2024
Topic Review
Galactosemic Cataract
A galactosemic cataract is cataract which is associated with the consequences of galactosemia.
  • 835
  • 03 Nov 2022
Topic Review
Prevention of AMD Onset
Age-related macular degeneration (AMD) represents the leading cause of irreversible blindness in elderly people, mostly after the age of 65. The progressive deterioration of visual function in patients affected by AMD has a significant impact on quality of life and has also high social costs. Many studies showed that a higher dietary intake of nutrients, such as lutein, zeaxanthin, beta carotene, omega-3 fatty acids and zinc, reduced the risk of early AMD. Regarding lifestyle habits, the association between smoking and AMD is currently accepted. Finally, retinal damage caused by ultraviolet rays and blue light is also worthy of attention. 
  • 833
  • 12 Aug 2021
Topic Review
A Brief Clinical Overview of Retinitis Pigmentosa
Retinitis pigmentosa (RP) is a hereditary disease that causes the degeneration of photoreceptor cells in the retina, starting with the rods, leading to a gradual loss of vision over time. RP is the most common type of inherited retinal dystrophy and affects over 1.5 million people worldwide, leading to a high burden on patients and society. Common symptoms of RP include nyctalopia and gradual loss of peripheral vision, which can ultimately lead to blindness. RP is one of the primary causes of visual disability and blindness in individuals under 60 years old.
  • 832
  • 12 May 2023
Topic Review
Cell Therapy for Retinal and Optic Nerve Diseases
Retinal Degenerative diseases and Optic Nerve diseases have been largely characterized and are considered leading causes of blindness worldwide.  One of the hopes for possible treatments lies in cell therapy. This entry updates those that are the subject of clinical trials and therefore have a better chance of reaching clinical use. The aim of this review was to provide an update on the potential of cell therapies to restore or replace damaged and/or lost cells in retinal degenerative and optic nerve diseases, describing the available cell sources and the challenges involved in such treatments when these techniques are applied in real clinical practice.
  • 826
  • 07 Dec 2021
Topic Review
Mouse Models of Retinitis Pigmentosa-59
Retinitis pigmentosa-59 (RP59) is a rare, recessive form of RP, caused by mutations in the gene encoding DHDDS (dehydrodolichyl diphosphate synthase). DHDDS forms a heterotetrameric complex with Nogo-B receptor (NgBR; gene NUS1) to form a cis-prenyltransferase (CPT) enzyme complex, which is required for the synthesis of dolichol, which in turn is required for protein N-glycosylation as well as other glycosylation reactions in eukaryotic cells. The mouse is the most commonly used vertebrate animal model in experimental biology, there have been efforts to generate murine models of RP59.
  • 823
  • 30 Nov 2022
Topic Review
Silicone Oil in Surgical Management of Endophthalmitis
Endophthalmitis represents one of the biggest diagnostic and therapeutic challenges in modern ophthalmology. It threatens all forms of intraocular surgery from intravitreal injections to corneal transplants and vitrectomies and it is discussed on all surgical consent forms. Silicone oil reduces the risk of postoperative retinal detachment, especially in case of undetected retinal breaks, produces compartmentalization of the eye, may lead to early visual recovery, allows laser photocoagulation, prevents severe postoperative hypotony and has antimicrobic activity due to an inhibitory effect for several species of pathogens. 
  • 822
  • 24 Oct 2022
Topic Review
AMD and the Complement System
Wet age-related macular degeneration (wAMD) is characterized by choroidal neovascularization (CNV), and it is the leading cause of blindness affecting elderly in the Western world. AMD is a complex disease that has strong associations with the complement system. All three initiating complement pathways may be relevant in CNV formation, but most evidence indicates a major role for the alternative pathway (AP) and for the terminal complement complex, as well as certain complement peptides generated upon complement activation. Since the complement system is associated with AMD and CNV, a complement inhibitor may be a therapeutic option for patients with wAMD. The aim of the review is to (i) reflect on the possible complement targets in the context of wAMD pathology, (ii) investigate the results of prior clinical trials with complement inhibitors for wAMD patients, and (iii) outline important considerations when developing a future strategy for the treatment of wAMD.
  • 816
  • 22 Feb 2021
Topic Review
Retromode Imaging in Age-Related Macular Degeneration
Retromode is a relatively new retinal-imaging technique that is based on the transillumination principle and is obtained with a scanning laser ophthalmoscope that uses light in the infrared spectrum. The laser light penetrates into the deep retinal layers and the choroid. Retromode images are captured with a laterally displaced aperture, and the detector captures only the scattered light. The result is a high-contrast pseudo-three-dimensional image. Age-related macular degeneration (AMD) is a disabling retinal disease. AMD is characterized in its early stage by small and intermediate drusen formation, while the signs of intermediate AMD are large drusen and/or pigmentary abnormalities. Late AMD has two forms, geographic atrophy, which is the advanced form of dry AMD, and wet AMD. Most of the lesions of AMD are located in the outer layers of the retina. This new imaging method can provide a glimpse of the deep retinal layers’ topographic changes in a non-invasive, fast, and effective way that can match the other imaging tools available. 
  • 815
  • 03 Apr 2023
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