The majority of people in the 40 to 45-year-old will quietly appear see thing difficultly, at first they can not look at a small writing thing, we must move books, newspapers a little far away, then we can see more clear.
In fact, this is a normal physiological phenomenon of human body, it is the body signals of the beginning of aging. With age, lens of the eye gradually hardening, thickening, and the ability to regulate the eye muscles also will be diminished, resulting in reduced ability to zoom.
Therefore, when we look at close objects, the image that projects on the retina can not be completely focused, when look at close objects our eyes will be blurred. Even if you take good eye protection, the degree of presbyopia will increase with age, generally in accordance with 50 degrees every five years to enhance the speed of increase. According to age and eyes, presbyopia degree of correspondence tables, most of their own eyes and refraction in good condition, that is, no myopia, hyperopia people, the age of 45 eyes of presbyopia degree is usually 100 degrees, 55 to 200 degrees, to 60 year-old, degrees will be increased to 250 degrees to 300 degrees, then took degrees in general is no longer the old eyes deepened.
(more eyeglasses…)