Articles tagged with Retina
Researchers have identified a class of retinal cells called JAM-B cells that play a crucial role in detecting upward motion. These cells have a distinct physical arrangement of their dendrites, which is crucial for their function.
Researchers at Schepens Eye Research Institute have identified a chemical compound that can awaken dormant Müller cells in the eye, transforming them into progenitor cells capable of generating new retinal cells. This breakthrough discovery offers new potential for treating diseases such as macular degeneration and retinitis pigmentosa.
The Argus II is the second-generation electronic retinal implant designed for treating blindness caused by Retinitis Pigmentosa. It consists of an array of 60 electrodes attached to the retina, conducting information from an external camera to provide rudimentary sight to implanted subjects.
Researchers found that the N-myc gene coordinates retina growth to ensure proper thickness, a crucial process for converting light into images. The study provides new insights into retinoblastoma, a rare pediatric eye cancer, and may lead to improved understanding of eye formation.
Two transporters, SMCT1 and SMCT2, can circumvent the blood-retinal barrier to deliver lactate and ketone bodies to a healthy eye, potentially preventing neuronal cell damage. Understanding these transporters' activity may enable early diagnosis of diabetic retinopathy and natural delivery mechanisms for drugs.
Researchers Robert Schafer and Tirin Moore studied how the frontal eye field generates saccades, finding that attentional circuitry governs motor circuitry. The study used eyetracking and microstimulation to analyze saccade patterns, revealing a mechanism for attention to modulate saccade motor commands.
A study published in BMC Evolutionary Biology found that ancient fish, specifically Australian lungfish, had retinas with visual pigments similar to those of early four-legged vertebrates. This suggests these creatures may have seen their new environment in full color when they first emerged onto land.
Researchers studying elevated homocysteine levels on vision found that it disrupts the retina's blood vessel network. Elevated homocysteine levels can also interfere with protein synthesis, collagen structure, and folate transport, leading to retinal damage and vision loss.
A research team at UCSC and Salk Institute has discovered a new retinal cell type called the upsilon cell, which shares similar properties with Y retinal ganglion cells. The discovery may help humans see motion and is a significant step towards understanding how primates process visual information.
Researchers found evidence that the two sides of the retina interact to enhance shape recognition, coordinating their responses with unexpected temporal precision. This study challenges the traditional view that communication between brain hemispheres is necessary for shape recognition.
Consuming higher levels of lutein and zeaxanthin may be associated with a reduced risk for age-related macular degeneration. The study found that participants who consumed more of these yellow plant pigments had lower rates of advanced AMD and large or numerous intermediate drusen.
Researchers found that mice lacking a critical component of the retinal clock exhibit abnormal gene activity and defective electrical responses, but their eyes appear normal. The study suggests that the retina's autonomous circadian clock plays a crucial role in visual processing.
Researchers have identified Müller glial cells with stem cell properties that can regenerate the retina and restore vision in zebrafish. The team hopes to develop this approach for human use, potentially using a person's own cells to stimulate growth and repair.
A study published in Nature Medicine found that increasing omega-3 intake in mice reduced damaging vessel growth in the eye, a cause of retinopathy and blindness. Omega-3 supplementation is being tested in premature babies at risk for vision loss in a clinical trial.
A study found that higher dietary intake of omega-3 fatty acids and fish consumption may reduce the risk of advanced age-related macular degeneration. Vitamin D levels were also inversely associated with early stages of the disease, suggesting a potential protective effect.
Subconjunctival insulin delivery has been shown to treat degenerative and inflammatory responses in diabetic rat retinas. Low-dose periocular insulin delivery may also be a potential treatment for early diabetic retinopathy, according to researchers.
Researchers at Bonn University have developed a software system called the Retina Encoder, which helps the brain interpret signals from retinal implants. The system learns to translate camera signals into a language that the brain understands, allowing blind subjects to perceive contours and orientation.
Scientists at UTMB and University of Michigan develop direct electrical link between nerve cells and photovoltaic nanoparticle films, enabling light-stimulated nerve-signaling devices. This breakthrough could lead to creation of a nanoparticle-based artificial retina with unprecedented flexibility, compactness, and reliability.
Researchers at USC have developed an advanced retinal implant, the Argus II, designed to help patients with retinitis pigmentosa regain some vision. The device, approved by the FDA, uses an external camera and video processing system to provide rudimentary sight to implanted subjects.
A new study found that a commonly used drug to slow central vision loss can also treat diabetic retinopathy, a common complication of diabetes. The treatment showed promise in improving reading ability and reducing swelling in the retina by targeting vascular endothelial growth factor, a protein that promotes unwanted blood vessel growth.
Scientists successfully transplanted light-sensing cells into the eyes of mice with retinal degeneration, restoring their visual function. The technique has implications for degenerative eye diseases and suggests that changes in stem cells may be necessary for transplantation to succeed.
Researchers at Yerkes National Primate Research Center use MRI to capture images of the retina's elusive layers, revealing layer-specific changes in retinitis pigmentosa. This breakthrough technology has potential for early diagnosis and treatment of serious eye diseases.
A new study provides a reliable way to diagnose cerebral malaria in children through changes to the retina. This discovery could greatly reduce child mortality rates from this major childhood killer.
Researchers from the University of Bonn have discovered how the eye adapts to darkness by forming a network that combines signals from multiple light-sensitive rods, boosting sensitivity. The study found that dopamine triggers the closure of a channel in amacrine II cells, inhibiting communication and allowing for signal focusing.
Researchers at UC Berkeley and LBNL have developed light-sensitive switches that can trigger chemical reactions, muscle contractions, and nerve cell stimulation. The goal is to equip retina cells with these switches to restore light sensitivity in people with macular degeneration.
Researchers found that Vax2 protein shuttles between nucleus and cytoplasm in response to Sonic hedgehog signaling molecule. In its nuclear state, Vax2 represses Pax6, allowing optic nerve development. In contrast, Pax6 regulates retinal fate. This coordination is crucial for proper eye development.
Researchers have developed a gene therapy treatment that restored retinal function to near-normal levels and prevented degeneration in cones of mice with Leber congenital amaurosis. The study shows promise for potential human applications, offering new hope for individuals affected by this condition.
The human retina can transmit data at roughly 10 million bits per second, similar to Ethernet connections. Researchers used a miniature multi-electrode array to record electrical impulses from guinea pig retinas, revealing that sluggish cells convey most of the information.
Scientists at Johns Hopkins have successfully blocked the advance of retinal degeneration in mice with antioxidants, including vitamin E and alpha-lipoic acid. The study found that high oxygen levels in the retina kill cone photoreceptors, which are critical to central vision.
Rick Cote, a professor of biochemistry and molecular biology at UNH, has received a $1.4 million grant from the NIH to study the central enzyme that controls initial steps of vision. His research aims to understand how genetic or environmental defects in the visual pathway can cause vision loss or total blindness.
Apolipoprotein E (apoE) may play a role in age-related macular degeneration, despite its link to Alzheimer's disease. The study aims to understand why apoE-4 correlates with reduced incidence of macular degeneration.
Researchers at the University of Manchester are investigating molecular mechanisms behind retinoschisis to find a cure. They will build on existing research to develop new treatments and diagnostic tests for this genetic disorder.
The MIT 'seeing machine' allows visually challenged people to see images, videos, and text through a desktop device. In a pilot clinical trial, 60% of participants accurately interpreted visual language and navigated a virtual environment with the help of the device.
Researchers have identified NRL as the earliest marker of rod precursors, allowing them to pinpoint the exact time at which rods are formed. This discovery provides a new vantage point for understanding healthy visual system development and raises the possibility of re-directing cell production to stave off eye disease.
Researchers at Princeton University discovered that retinal ganglion cells organize their actions based on pair interactions rather than group discussions. This finding could shed light on how brain cells work together to make decisions.
Researchers at the NIH successfully introduced a light-absorbing protein into mouse retinal cells, enabling them to send signals to the brain and regain some visual function. The study suggests that this approach could be used to treat various forms of retinal degenerative eye diseases.
Researchers found that the feedback system regulating eye growth doesn't consider all spatial frequencies and only focuses on the finest detail present. This discovery has implications for the development of myopia and suggests that images of low contrast can be just as effective at initiating growth as blurred images.
Researchers say cannabidiol, a compound found in marijuana, may protect the eye from growing leaky blood vessels and prevent diabetic retinopathy. Early studies indicate it works as an antioxidant to neutralize toxic superoxides and inhibit destructive systems.
Researchers discovered that light-sensing retinal ganglion cells are active and functioning at birth, surprising the developmental timeline of the mouse retina. The cells react to light in two ways, sending messages to parts of the brain controlling circadian rhythms and visual development.
Researchers found that passive smoking significantly increases the risk of age-related macular degeneration, with pack years of cigarette smoke being a major determinant. Regularly smoking for 40 years or more can almost triple this risk compared to non-smokers.
Researchers precisely imaged and counted color-receptive cones in a living human eye for the first time, revealing that color perception goes beyond hardware limitations. The brain's normalization mechanism balances colors despite variations in the visual system.
Dr. Green will receive a $75,000 per year grant to study the inner retina and optic nerve in people with MS using optical coherence tomography. This research aims to predict disability in MS patients by observing early changes in the retina.
Researchers have discovered a genetic finding that may hold the key to unlocking treatments for farsightedness and nearsightedness. The MFRP protein, found in a rare eye disorder called nanophthalmos, regulates eye growth and refraction, making it a promising target for correcting severe refractive errors.
Scientists have found that melanin, a pigment in the body, acts as a sponge to absorb and destroy free radicals that damage retinal cells. This discovery offers hope for preventing macular degeneration, a leading cause of blindness.
Researchers used a novel method to monitor brain activity during blinking, finding that brain areas responsible for visual input are temporarily suppressed. This neural mechanism may help prevent the brain from becoming aware of the eyelid sweeping down over the pupil during a blink.
The retina's dynamic adaptation allows it to prioritize unusual features over routine ones, improving predictive coding and enhancing the ability to pick out new information. This process occurs rapidly, often within a few seconds of exposure to a novel environment, and is observed in both salamanders and mammals.
A new study reveals how the GDF11 protein controls retinal-cell differentiation during development, making it an attractive therapeutic target. By manipulating this process, researchers may be able to harness the power of existing stem cells in the retina to replace damaged or diseased cells and potentially cure visual disorders.
The retina's neural connections can reorganize and adapt in response to sudden changes in ambient light, allowing it to process visual information more efficiently. This finding has implications for the development of prosthetic retinal devices and may help researchers better understand the underlying mechanisms of vision.
A recent study using fMRI found limited reorganization in the primary visual cortex of adult monkeys after retina injury, contradicting previous thinking on brain plasticity. The results suggest that adult brains may not be as capable of compensating for injuries as previously believed.
Researchers at the Salk Institute found that the retina is the default pathway for eye development in mammals, controlled by two chemical cues. This discovery has important implications for human therapy, as it highlights the need to regulate stem cell development and prevent excessive growth of the retina.
Mayo Clinic researchers found that green laser pointers can cause irreversible damage to the retina's pigment layer. Longer exposures and higher-powered lasers increase the risk of vision damage.
USC researchers successfully implanted six blind patients with a retinal prosthesis, enabling them to detect light, identify objects, and perceive motion. The device shows promise for treating degenerative eye diseases like retinitis pigmentosa and age-related macular degeneration.
A new 'bionic eye' system aims to restore some degree of sight for people with degenerative retinal diseases like retinitis pigmentosa. The system, developed by ophthalmologists and physicists, uses a tiny camera and computer processor to directly stimulate the inner retina with visual signals.
The study developed mice with a mutant form of ELOVL4, which causes significant lipofuscin accumulation and photoreceptor death, closely resembling human AMD and STGD. This model now permits testing of potential therapies for the dry version of age-related AMD and STGD.
Researchers at UT Southwestern have identified a protein called HIF-2a, which may help treat premature blindness caused by retinopathy of prematurity. The study found that controlling this protein could prevent or treat ROP before it happens, offering new hope for premature babies.
Researchers found that recognizing faces requires visual perception, while lower-level aspects like orientation can be processed without awareness. The study used binocular rivalry experiments and inattentional blindness to demonstrate the importance of visual processing in face recognition.
Researchers found that engineered fruit flies with resistant rhodopsin protein retained vision twice as long as normal flies, but eventually developed blindness due to delayed decay of rhodopsin. The study suggests that degradation of visual proteins contributes to vision loss and may help reduce blindness severity in rare individuals.
Researchers have discovered cellular changes in animal retinas that occur in human retinal detachments, implying experimental therapies could be effective. Oxygen therapy has been shown to reduce cellular damage and improve outcomes in animals, and further studies suggest it may also benefit humans.
Researchers have developed a new mouse model of Leber congenital amaurosis, a rare form of childhood blindness. The model, which lacks the AIPL1 gene, closely mimics the inherited human disease and shows severe retinal degeneration starting around two weeks of life.
The artificial retina project aims to restore vision in blind individuals by capturing visual signals and transmitting them to the brain. The device is a miniature disc with an electrode array that stimulates optical nerves, enabling users to see large letters and differentiate between objects.