The third layer in the eye: the retina

The third layer in the eye: the retina, which is composed of layers, where nerve cells called rods and cones, a homogeneous form in all parts except in two areas, which are:
The entry area of the optic nerve to the eye optic disc where there are not networked to be a vision in this area non-existent, so called: blind spot.

An area called fovea, an area in the retina are like the pit small and be on one line with the lens, and where many of the cells of the cones so she can see colors and distinguish shapes more accurately than any other place in the retina, so you when you look at going to move your eyes so Down with the image you want to see on this place in the retina. As you do now, and as you read this.
If affected this region, the consideration will be affected much more than if affected by another area of the retina.

There is also the lens of the eye where the softer rubber and so can be changed so that the image on the retina is located.The lens hanging from the edges and surrounded by a capsule. It is possible to change, for example in diabetes becomes opaque and this so-called White Water, and can make the process of switching the lens.If you look at a picture near the ciliary muscle pulls the lens on the front allowing the lens to pellet.If you look at a picture far, the ciliary muscle relaxes.

Water gel, which is located at the back of the eye between the lens and the retina:Is a gelatinous liquid (generation) is transparent in the back of the eye. Contains very little of the phagocytic cells that gobble up the impurities that sour vision (Hallelujah) and has no blood vessels and is composed of water, salts and some sugars and collagen. Has a viscosity of equal to the viscosity of the water two to four times, making it the gelatinous shape.It also helps in the refraction of light rays entering the eye to fall on the right place in the retinaIt does not stick to the retina with it touching, but it stuck in only three places: on the front edge of the retina, in the macula, a region surrounded by Pal fovea, and in the area of ​​entering the nerve theoretical.
It helps to keep the retina in place.In contrast to the liquid in the anterior part of the eye (watery fluid that is secreted and acting consistently any changed continuously), the fluid gel in the back of the eye is not changed but remains as it is, so if there is a thing such as bleeding or pus or otherwise, that will only go away with surgery.Sometimes moving liquid gel away from the retina Vensmi: the separation of the liquid gel.