眼睛,是一个光感受器,由视网膜中的锥状和杆状细胞等组成。当光线经过瞳孔、晶状体进入眼球,在视网膜上便形成物像;这些物像刺激感光细胞,冲动传入中枢后,即引起视觉。人眼视物,则靠晶状体的凹凸变化,改变折光来调节。这些过程,虽为大家所熟悉,但为了保护好视觉,使之明亮有神,而对眼睛所需的一些营养保健食物,却鲜为人们所重视。例如: 维生素A它是人体应摄入的14种维生素之 The eye, which is a photoreceptor, consists of pyramidal and rodlike cells in the retina. When the light passes through the pupil, the lens enters the eyeball and forms an image on the retina. These objects stimulate photoreceptors and impulses into the central nervous system, causing vision. Human visual material, then by the convex and concave changes in the lens, change the refractive adjustment. Although these processes are familiar to everyone, they are rarely regarded by the people for the purpose of protecting their eyesight and making them bright and healthy. For example: Vitamin A It is the body should be intake of 14 kinds of vitamins