What is the equator of retina?
Equator. The equator of the fundus is situated approximately 14 to 15 mm from the limbus. Clinically one of the easiest ways to locate equator of the fundus is to find the vortex veins. The choroidal veins drain into a vortex vein in each quadrant of the eye.
What is retina UMBO?
The umbo is the center of the foveola which in turn is located at the center of the fovea. The fovea is located near the center of the macula. It is a small pit that contains the largest concentration of cone cells. The retina contains two types of photosensitive cells, the rod cells and the cone cells.
What is retinal neovascularization?
Retinal neovascularization is defined as a state where new pathologic vessels originate from the existing retinal veins and extend along the inner surface of the retina.
What is the definition of retina in science?
Listen to pronunciation. (REH-tih-nuh) The light-sensitive layers of nerve tissue at the back of the eye that receive images and sends them as electric signals through the optic nerve to the brain.
What is the difference between angiogenesis and neovascularization?
Neovascularization encompasses both angiogenesis and vasculogenesis. Angiogenesis represents the classic paradigm for new vessel growth, as mature, differentiated ECs break free from their basement membrane and migrate as well as proliferate to form sprouts from parental vessels.
What is retina and their function?
The retina converts light that enters into your eye into electrical signals your optic nerve sends to your brain which creates the images you see. It’s a key part of your vision. The retina is the layer at the very back of your eyeball.
What is another name for Equator?
What is another word for equator?
| celestial equator | equinoctial |
|---|---|
| equinoctial circle | equinoctial line |
What is lamina in the eyes?
In human eye: The outermost coat. This region is called the lamina cribrosa. The blood vessels of the sclera are largely confined to a superficial layer of tissue, and these, along with the conjunctival vessels, are responsible for the bright redness of the inflamed eye.
How does neovascularization cause blindness?
This neovascular tissue causes physical separation of the layers of the retina and destruction of the normal tissue. Almost all neovascularization leaks, and, at times, bleeds. Loss of central vision occurs due to this rather rapid growth of abnormal blood vessels.
What is the retina of the eye?
View All. The retina is a light-sensitive layer that lines the back of the eye. It is only 0.2 mm thick and is about the size of a silver dollar. The retina is made up of 200 million neurons. The retina contains photoreceptors that absorb light and then transmits those signals through the optic nerve to the brain.
How thick is the retina at the equator?
The retinal thickness shows greatest variations in the center. The retina is thinnest at the foveal floor (0.10, 0.150-0.200 mm) and thickest (0.23, 0.320 mm) at the foveal rim. Beyond the fovea the retina rapidly thins until the equator. At the ora serrata (more…)
What is the function of the retinal layer?
This layer is responsible for converting relevant information from the image of the external environment into neural impulses that are transmitted to the brain. Broadly retina consists of two primary layers: an inner neurosensory retina and retinal pigment epithelium (RPE). 1
How does the retina work?
The retina is actually an extension of the brain, formed embryonically from neural tissue and connected to the brain proper by the optic nerve. Read More on This Topic. human eye: The work of the retina. So far, attention has been directed to what are essentially the preliminaries to vision.