一般来说人眼在45岁时,眼调节能力因为晶状体硬化以及睫状肌功能的减退而减弱,因此正常人眼此时视近物就会出现吃力,需要将物体移远才能看清楚的早期老花的现象。到了四十七八岁,调节力进一步下降,视近处物体更加不清晰时,就提示需要戴老花镜来进行矫正了。当然由于个体调节幅度的差异,有无屈光不正以及不良用眼习惯等,人眼的老视开始时间以及程度也不尽相同。 In general, the human eye at the age of 45, the ability to regulate the eye because of lens sclerosis and diminished ciliary muscle function and weakened, so the normal human eye as near objects will be strenuous, you need to move objects to see the early The phenomenon of old flowers. At forty-seven and eighty-eight years of age, the accommodative power dropped further. As the objects in the vicinity were more unclear, they suggested that reading glasses should be worn to correct them. Of course, due to individual differences in the rate of adjustment, with or without refractive errors and habits of the eye, the human eye’s presbyopic start time and extent are not the same.