Our eyes along with the skin are one of the only external organs of the human body. Due to this fact, they are quite susceptible to the elements of the weather, environmental pollution and things that are associated with the negative effects of close up work. However, what is quite interesting about this external organ is that in spite of these challenges, the eyes still remains one of the most resilient organs in the human body. Here are some interesting facts about this sensory organ of sight: Even in the case of the eye disease Glaucoma, your eyes have the ability to compensate for blind spots in your vision. The resilience of the human eye shows due to the fact that if you have one eye that has vision problems the stronger eye compensates for this by filling in visual deficits in the other eye. This is also the case wherey one eye has a stronger focusing power than the other.
With regard to the eyes when it comes to eye anatomy the second layer of the eyes is called the choroid. One of the important parts of the eyes that play an essential role in vision function is the crystalline lens of the eyes. Therefore, here is some information concerning the role that the crystalline lens of the eye plays in vision function and in helping us to see objects clearly:
The crystalline lens is located behind the iris of the eyes. The lens accounts for about one third of the focusing power of the eyes. The lens of the eyes serves various purposes in the function of our visual system. For example, like the lens of a camera the lens plays a vital role in focusing images that fall on the retina of the eyes from near distances to far distances. The crystalline lens of the eyes works in conjunction with the focusing muscles of the eyes which include the ciliary muscles.
The focusing muscles of the eyes play a role in the ability of the eyes to focus on near and distant objects which is also known as the process of accommodation.
For instance, in the process of a visual activity such as reading; a visual activity that requires close up focus, the eyes converge, (turn inwardly together), then the lens changes its focus and the pupil constricts. Therefore, the lens changes its focus to accommodate different types of vision activities depending on the type of visual activity we are performing whether or not it is near of far.
For instance, the muscles that are responsible for focusing cause the lens to become flat when you are looking at a distant object. This visual activity relaxes the focusing muscles and this is the case with distance seeing activities such as going to the movies and focusing on a theater screen in the distance. In the case of an activity such as reading the ciliary muscles contract and the lens becomes round in shape. This biological action causes light to bend and facilitate near focus.
At a young age, when we are in our twenties and thirties our crystalline lens is flexible in nature. Therefore, it is easy for this part of your eyes to change focus. However, as we get older our crystalline lens loses its flexibility due to the negative effects of aging on the visual system as well as the accumulation of stress and tension in the visual system resulting from many years of close up work. In the case of presbyopia for instance, at age 40 our eye's hardens and its ability to focus on near and far objects is clearly greatly reduced. In this case, our vision becomes weak and we are not able to see near objects as clearly as we are able to see distant objects.
When it comes to the resilience of the amazing human eye there is an application for the practice of an eye exercise program to improve your vision naturally here. The pursuit of such a program in this respect, as eye exercises, can work in strengthening the eye muscles and improving the focusing ability of the visual system so that the eyes can retain their ability to focus on near and distant objects clearly as a result of the process of accommodation.