初中生理卫生课本第136页提出了预防近视的四点注意事项,本文对这段教材作初步分析。眼这个光感受器与耳一样,是接受物理性刺激的外部感受器,它与鼻、舌接受化学性刺激的外部感受器不同。眼的感光机制的调节可分为:1.摄入眼内光量的调节;2.所看物体在眼内成象焦距的调节;3.摄光方向、位置的调 Junior high school physical health textbook page 136 proposed four points of precautions to prevent myopia, this article for preliminary analysis of this textbook. The photoreceptor, like the ear, is an external receptor that receives physical stimuli and differs from the external receptors that undergo nasal or lingual chemical stimulation. The adjustment of the sensory mechanism of the eye can be divided into: 1. The adjustment of the amount of light taken in the eye; 2. The adjustment of the focal length of the object to be seen in the eye; 3. The adjustment of the direction of the light and the position