Vision without glasses scam - The structure of retina

by Johnathan Brewer Hi, I am Health specialist of the diseases Retina is a thin layer of nerve tissue, located inside the back of the eyeball. The retina is responsible for the perception of the image that is projected onto it by the cornea and lens, and transforms it into nerve impulses that are then transmitted to the brain.

Most strongly associated with the underlying retina covering the eyeball on the edge of the optic disc, retinal thickness varies in different areas: at the edge of the optic nerve, it is 0.4-0.5 mm in the fovea 0.2-0.25 mm, dimple of 0.07-0.08 mm, in the line is about 0.1 mm. The information is resource by vision without glasses scam. The complex structure of the retina can perceive the first light, process and transform light energy into irritation - signal which is encoded all the information about what the eye sees.

The most important part of the retina is the macula (macular area, yellow spot). The macula is responsible for central eyes vision, because it contains a large number of photoreceptors, namely cones. They give us the ability to see well in daylight. Macular disease can significantly reduce vision.

The first layer - the pigment epithelium Pigment epithelium extends throughout the optical part of the retina and directly borders the underlying choroids, having a relationship with a vitreous plate. Pigment epithelium is a single layer of closely spaced cells that contain a large amount of pigment cells are shaped hexagonal prisms and arranged in a single row. These cells are part of the so-called barrier, which provides selective intake of certain substances from the blood capillaries in the retina, choroid.

The second layer - the light-sensitive cells (photoreceptors) Sticks are a regular cylindrical formation length from 40 to 50 microns, the total number of rods in the retina of about 130 million. They provide vision in dim light, such as at night, having a very high light sensitivity. Cones in the retina of the human eye - 7 million and they act only in a bright environment. They are responsible for central vision and color vision shaped.

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Created on Dec 31st 1969 18:00. Viewed 0 times.

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