Retina

the retina. The retina is a light sensitive multilayered surface. It is in charge of recording electromagnetic energy and converting it to neural impulses for the brain to process. The eye also contains structures called the optic nerve and they blind spot. The optic nerve is located at the back of the eye and is in charge of carrying visual information to the brain so it can be further processed, such as when you snap a picture before it is printed out. The blind spot located on the retina…

system and in the eye support structures. Three layers form the wall of the eye: sclera, choroid, and retina. The sclera, a thick, white, outermost layer that includes the cornea is at the central anterior region allowing light to enter the eye. The choroid prevents light from scattering inside the eye that also includes the iris and its round opening, the pupil, that light passes through. The retina…

Calcified drusen have a shiny appearance. All of the other types of drusen can have calcification also, but calcified hard drusen are known to stand out the most. It is unclear how much drusen effects the development of macular degeneration. In some cases, there can be a little amount of drusen with a greater amount of visual damage, or there is a lot of drusen present and the vision may not be that bad. Drusen are infamous for being inconsistant. (Kanski, 1992). Non-exudative (dry) is by far…

Introduction Central retinal vein occlusion (CRVO) is a blockage in the main blood vessel that carries blood away from the retina (central retinal vein). The retina is the part of your eye that senses light and that sends signals to the brain that allow you to see. CRVO can cause you to have blurry vision. It can also make you lose some or all of your vision. The condition usually affects only one eye. What are the causes? This condition is usually caused by a blood clot that forms inside the…

hyaloid canal compresses, so that the eye’s internal pressure and volume remain constant (Merriam-Webster). Optic nerve: A part of the central nervous system, the optic nerve connects the eye to the brain, carrying electrical signals formed by the retina to be interpreted as images (Medicine Net). Central retinal vein: The central retinal vein is where blood circulating in the eye is returned to the heart to be cleaned. It forms the arterioles, branches of an…

retinopathy might not require immediate treatment, but good blood sugar control can help slow down its progression. In the case of proliferative diabetic retinopathy, the following treatment options may be used depending on the specific problems with your retina. 1. Focal Laser Treatment (Photocoagulation) This is one of the best treatments used in most occasions to slow or even stop leakage of blood and other fluid in the eye. Basically, laser burns are used during the procedure to treat…

The article “What the Frog’s Eye Tells the Frog’s Brain” by Lettvin et al. analyzes the activity of a single fiber in the optic nerve of the frog. This study was done on frogs because of the uniformity of the frog’s retina, the normal lack of eye and head movements, and relative simplicity of the connection of the frog’s eyes to the brain. The study’s initial argument was that the nervous apparatus in the eye itself is dedicated to detecting certain patterns of light and their changes. Upon…

Retinopathy is one of the most frequent newer causes of blindness(AJN). Retinopathy is much similar to macular degeneration. In diabetic retinopathy there is also a sub retinal hemorrhage. However, there are abnormal vessels on the surface of the retina; as well as exudates. Exudates are yellow flecks caused by lipid residues of leakage from damaged…

the back of your eye known as the retina, light receptors on retina then receive and transmit that information to the brain. The brain, conveys and translate all that into an image. When you look at something... - The image must be reduced in size so that it can fit on the retina The scattered light must come together and must be focused onto retina to form a image Since the surface of the retina is curved, the image must be curved to match the curvature of retina Problems that your eye may…

that helps reflect and bend light in a way that makes it possible for it to pass through the pupil, which lies in the center of the iris. The image is focused by the lens and cornea which is then projected in an upside down position onto the retina. The retina may well be the most important…