通过食物改善老花眼（Improve presbyopia through food）.doc

通过食物改善老花眼（Improve presbyopia through food） The therapeutic methods of presbyopia Presbyopia is a physiological phenomenon is not a pathological state and does not belong to the ametropia, is an inevitable problem in vision people enter old age after the. With the increase of age, eye regulation ability decreased gradually due to the recent difficulties that patients in close work, must be in its static refractive outside plus a convex lens can have a clear vision of the past, this phenomenon is called presbyopia (presbyopia). Presbyopia is directly related to the occurrence and development of age and occurs mostly in 45 years later, it happened sooner or later and the severity is related to other factors, such as the original status, height ametropia reading habits, lighting and general health etc.. As age increases, the forces of change change. Figure 1 is the Duane from the map can clearly see the adjustment of the determination results of 4000 human eyes, a teenager adjusting force is 14.0D, the near point at 7cm after that age, near point gradually and continuously back, at the age of 36 has retreated to 14cm, the control force of 7.0D by the age of 45, near point to 25cm, adjusted only 4.0D. By age 60, only about 1.0D is maintained. Table 1 adjusted normal values for different ages (D). Principle of hyperopia Most of the near working distances are between 28 and 30cm. Emmetropia by the age of 45, only 3.5D ~ 4.0D regulation the regulation level has reached the limit to see near objects in this case, if you need to continue to do close work, to take all the accommodation can be usually sight. In order to keep close vision, the eye should work in a tense manner, and the continuous tension will inevitably cause visual fatigue. In general use adjustment can only use all the adjusting force of 2/3, but also to 1/3 as to keep power, work up to be comfortable as mentioned earlier, the 45 year old eyes, such as hand 25cm, to use all the accommodation, so the visual fat