stine is a sensitive to a light sensitive layer, which rolled back to the back of the eye . The thickness is only 0.2 mm and has approximately the size of the silver dollar.The Styted consists of 200 million neurons, many of which are photoreceptors. Fashion steniffs absorb light, and then convert and transmit these signals through the visual nerve into the brain.
There are two main types of photoreceptors, rods and cones, on the retina retina.Fovea in Macula, which is the central space of the retina, has the highest concentration of cones, but not a rod. CONTR provide a better resolution of the image.The periphery of the retina, on the other hand, has many rods, and these types of photoreceptors are the best detectors.This organization of cones and bars means that the night star looked directly, will appear very boring, but if you can see with peripheral vision, it will be perceived as brighter and more visible.
Very similar to the film in the camera, the images pass through the eye lens and focus on the retina. Then, the retina converts these images into electrical signals and sends them to the brain.
When the doctor extends his eyes during a complete examination in , he says he or she looks at the eye.Fundus includes Retina,And also the following parts:
- Rear pillar: rear rear on the back of the retina and includes a visual and macula / li>
- Visitor’s head nerve: Optical nerve head with aVisual nerve assent on the back of the eye. It is made of millions of nerve fibers and transmits visual information to the brain for processing.
- Macula: Macula: A specialized pigmented part of the retina in the center of the retina, which gives us a central vision. In the center of Makula is FOVYA. The Council has an area of better visual acuity.
- Ecuador and medium peripheral retina: This is the area of the retina, as it extends from the rear post.
- Serrata: Serrata Pray is the retinal area between the mesh and the ciliary case.This compound takes note of the transition from the non-specific field of the retina to the light sensitive field.