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retinae képek

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Strelitzia retinae foliage, Bird of paradise foliage. House plant isolated on white background.-stock-foto
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This image captures the many layers of nerve cells in the retina. The top (green) layer is made up of cells called photoreceptors that convert light into electrical signals to send to the brain. The two most well-known types of photoreceptor cells are rod-shaped and cone-shaped. Rods help us see in low light conditions, but can and-stock-foto
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According to a new study in mice by scientists at the National Eye Institute (NEI), immune cells called microglia can completely repopulate in the retina after being nearly eliminated. Cells also exhibit their normal organization and functioning. Findings point to potential therapies to control inflammation and slow the progression of rare retinal diseases such as retinitis pigmentosa (RP) and age-related macular degeneration (AMD), the most common cause of blindness in Americans 50 years and over.-stock-foto
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This image shows mature iPSCs (induced pluripotent stem cells) derived from retinal pigment epithelium (RPE) cells, magnified by super-resolution confocal microscopy.-stock-foto
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A scanning electron micrograph image shows a polarized EPR monolayer on a biodegradable scaffold. The image is accelerated to highlight the scaffold in blue, three RPE cells (brown) and the apical process of RPE monolayer cells are light green.-stock-foto
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A genetic disorder of the nervous system, neurofibromatosis causes tumors to form on nerves throughout the body, including a type of tumor called optic nerve glioma that can lead to childhood blindness. The image was used to activate the unique imaging capabilities of one of our most recent (at the time) laser scanning microscopes and is of a wild-type (normal) mouse retina in the fiber optic layer.-stock-foto
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Bipolar cells use dendrites to receive nerve signals from light-sensitive photoreceptor cells which they transmit to other cells in the retina.-stock-foto
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Researchers at the NIH's National Eye Institute (NEI) have found that energy-producing organelles in the eye's photoreceptor cells, called mitochondria, function like microlenses that help channel light to the outer segments of these cells. where it is converted into nerve signals. The finding in ground squirrels provides a more accurate picture of the optical properties of the retina and could help detect eye disease earlier. The findings, published today in Science Advances, also shed light on the evolution of vision.-stock-foto
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Thin section of the optic lobe of a Drosophila pupal brain. Photoreceptor axons (blue) and lamina neurons (green) bypass the lamina and project into different layers of the medulla (red, center), where visual information is integrated and processed and then relayed to the lobula complex ( red, bottom).-stock-foto
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Here you can see the lens development process at work in a cross section of tissue from an adult mouse. In mice, as in humans, a single layer of rod-like epithelial cells (far left, blue/green) gives rise to specialized lens cells (middle, blue/green) throughout life. The new cells resemble their progenitor cells, with the nuclei (blue) and cytoskeletal protein actin (green). But soon these cells will produce large amounts of water-soluble proteins, called crystalline, to improve their transparency, while gradually breaking down their nuclei to eliminate light-scattering mass.-stock-foto
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Cells in an injured mouse eye can be coaxed into regenerating into neurons, and these new neurons appear to integrate into the eye's circuitry, according to new research. The findings potentially open the door to new treatments for eye trauma and retinal disease.-stock-foto
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Neural circuits in the mouse retina. Cone photoreceptors (red) allow color vision bipolar neurons (magenta) to relay information further down the circuit and a subtype of bipolar neuron (green) helps process signals detected by other photoreceptors in the penumbra.-stock-foto
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An NIH-funded mouse study is the first to show that visual stimulation helps rewire the visual system and partially restores sight. This image shows regeneration of mouse retinal ganglion cell axons (magenta and green) extending from the site of optic nerve injury (left).-stock-foto
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Microglia, a type of nervous system cell previously suspected of causing retinal damage, has been shown to be beneficial in slowing the progression of prion disease in the brain, and now in the retina. In this image, microglial cells (green) engulf and remove prion-damaged photoreceptors (red), which appears to slow retinal degeneration.-stock-foto
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A new clinical study led by the National Eye Institute (NEI), part of the National Institutes of Health, will follow 500 people over five years to learn more about the natural history of age-related macular degeneration (AMD). Using the latest technology to visualize eye structures and measure their function, researchers hope to identify biomarkers of disease progression, long before it progresses to advanced disease and results in vision loss. AMD is the leading cause of visual impairment and blindness in people age 50 and older in the United States.-stock-foto
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Retinal pigment epithelium (RPE) cells form unique patterns that can be used to track changes in this important layer of tissue at the back of the eye, researchers from the National Eye Institute (NEI) have found. Using a combination of adaptive optical imaging and a fluorescent dye, the researchers used the RPE patterns to track individual cells in healthy volunteers and people with retinal disease. The new finding could provide a way to study the progression and treatment of blinding diseases that cause RPE.-stock-foto
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In healthy retina (left), microglia (green) have a branched structure that covers the retina. Without TGF' signaling (right), microglia lose their branched structure and attach to blood vessels (white). M'ller's glia became abnormal and acquired activation markers (red).-stock-foto
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A new study in rats shows that stem cell secretions, called exosomes, appear to protect cells in the retina, the light-sensitive tissue at the back of the eye. The study was conducted by researchers from the National Eye Institute (NEI), which is part of the National Institutes of Health.-stock-foto
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Scientists at the NIH's National Eye Institute have developed a promising gene therapy strategy for a form of Leber congenital amaurosis (ACL), a rare disease that causes severe vision loss in children. The scientists tested their approach using retinal tissue made in the lab from patient cells, called retinal organoids, one of which is pictured here.-stock-foto
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Retinal ganglion cells are neurons that transmit information about light from the eye to the brain via a structure called the optic nerve. Here, new neurons (green) and their supporting cells, called astrocytes (red), have been created in a Petri dish from stem cells. Making retinal ganglion cells and astrocytes from stem cells could one day help doctors rewire optic nerves damaged by glaucoma.-stock-foto
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A competition for radical ideas in the fight against blindness will move on to its next phase by challenging participants to build prototypes of working human retinas. The National Eye Institute (NEI) 3-D Retina Organoid Challenge (NEI 3-D ROC 2020) is a $1 million federal competition designed to create lab-grown human retinas from stem cells. The organoids developed for the competition will mimic the structure, organization and function of the human retina, the light-sensitive tissue at the back of the eye.-stock-foto
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By looking through a patient's enlarged pupil during a dilated eye exam, eye care professionals can view the retina, the postage stamp-sized tissue that lines the back of the eye. inner eye and look for irregularities that may signal the development of vision loss.-stock-foto
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Structure of an eye with zoom on the retina and fovea.-stock-foto
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Anatomy of an eye and vision, image reflection (pencil) on the retina.-stock-foto
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Eye: detachment of the retina, which detaches from the underlying choroid.-stock-foto
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Inner ear and vestibular apparatus with semicircular canals, macule.-stock-foto
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Cone, photoreceptor cell of the retina allowing night and day vision.-stock-foto
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Normal vision in a healthy eye: the image forms on the retina.-stock-foto
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Eye: treatment of macular degeneration by RNA interference.-stock-foto
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Eye: sagittal section of a lens with severe cataract.-stock-foto
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Sagittal view of the eye anatomy showing lens, retina, cornea, iris, choroid.-stock-foto
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Inner ear (organ of hearing) and vestibular system.-stock-foto
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Eye: detachment of the retina, which detaches from the underlying choroid.-stock-foto
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Functioning of the macule: organ of static balance (position of the head).-stock-foto
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Anatomy of an eye and vision, pencil reflection on the retina.-stock-foto
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Eye: treatment of macular degeneration by RNA interference.-stock-foto
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Functioning of the macule: organ of static balance (position of the head).-stock-foto
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Organization of photoreceptors into receptor fields transmitting nerve impulses to bipolar cells.-stock-foto
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Sagittal view of the eye anatomy showing lens, retina, cornea, iris, choroid.-stock-foto
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Eye: detachment of the retina, which detaches from the underlying choroid.-stock-foto
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