25th January 2009 In the previous post we were considering the visual apparatus of humans, what are their weaknesses. Using as a reference for other animals, we were comparing how our eyes and other visual system, which went well and those areas in which no. I was giving some reason to put us in a good place within the animal kingdom. To summarize: Our image sharpness is very good. The lens is an eye-shaped biconvex lens which is located behind the iris and in front of the vitreous humor. Its main purpose is to allow focus objects at different distances. This is achieved by increasing its curvature and thickness, a process called accommodation. The crystal is characterized by high concentration of proteins, which gives it a refractive index higher than the fluid surrounding it. This is what gives it its ability to refract light, helping the cornea to form images on the retina. As the subject’s age increases, the lens is gradually losing its ability to accommodate. This phenomenon is known as presbyopia or eyestrain and its causes are unknown. Affects the entire population from fifty years, requiring the use of glasses to focus near objects. The main disease that affects the crystal is waterfalls. This name is known to any loss of transparency of it that affects the vision. the only way to go around Israel is to and book online with Israel Maven Its causes are diverse and when they are at an advanced stage requiring surgery.