老花眼介绍（Presbyopia is introduced）.docVIP

老花眼介绍（Presbyopia is introduced） Presbyopia is introduced What is the 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 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.. Presbyopia is what causes? (1) the cause of the disease; 1. age and adjustment of presbyopia is the essence of impaired ability to regulate the eye, age is one of the main factors affecting the regulation force, namely increasing the refractive power of the eye, through the crystal shape, convex variable to achieve, and the crystal in life is increasing, because the equatorial region of epithelial cells continuously the formation of new fiber, adding new cortex to the crystal on both sides, and the old fiber to the area, and with the increase of age, the crystal density gradually increased and the elasticity decreased gradually. The crystal shape is changed by convex lens capsule (mainly anterior capsule) mediated, capsular elasticity decreased gradually with the increase of age, and with the increase of age, the ciliary body and hypertrophy of fibrous tissue is slow because of the savings, crystal also increase gradually, although it is not crystal suspensory ligament with what the age of change, but the ciliary body and the crystals are close to each other will inevitably affect the crystal suspensory ligament tension. Early in life, human adjustment is large, about 15.00D ~ 25.00D