Traditional Culture Encyclopedia - Traditional festivals - As shown in the figure is a schematic diagram of the human eye, try to answer the following questions according to the diagram: (1) the light reflected from external objects into the eye imaging, thro

As shown in the figure is a schematic diagram of the human eye, try to answer the following questions according to the diagram: (1) the light reflected from external objects into the eye imaging, thro

As shown in the figure is a schematic diagram of the human eye, try to answer the following questions according to the diagram: (1) the light reflected from external objects into the eye imaging, through the pathway is ___.
(1), (2) the process of visual formation is: light reflected from external objects, through the cornea, the aqueous humor, from the pupil into the eye, and then through the lens and the vitreous refraction, in the retina can form a clear image of the object, the object stimulates the photoreceptor cells of the retina, these photoreceptor cells produce nerve impulses along the optic nerve to the visual center of the cerebral cortex, the formation of vision. These photoreceptor cells produce nerve impulses that travel along the optic nerve to the visual center of the cerebral cortex, where vision is formed.

(3) When looking at a near object, the convexity of the lens must be increased through the contraction of the ciliary muscle, so that the image of the near object can fall on the retina, in order to see clearly. Prolonged close work, such as reading, writing, watching TV, playing video games, etc., so that the eyes are adjusted for a long time of tension, the head is tilted forward, and the eyeballs continue to be congested with blood, and the pressure in the eye is correspondingly high, as well as extraocular muscle tension and compression of the eyeballs, and the eyeballs will be filled up. The tension and compression of the eyeball, or the traction of the vortex vein during the adjustment, hindering the flow of blood, so that the resistance of the sclera is weakened, resulting in excessive convexity of the lens, which can not be restored; in severe cases, the anterior and posterior diameters of the eyeballs are too long, so that the image formed by the light reflecting from the objects in the distance falls in the front of the retina, so that you can't see objects in the distance clearly, resulting in the formation of nearsightedness. Myopia can be corrected by wearing concave lenses.

The answer is: (1) cornea; lens; vitreous humor

(2) B lens; F retina; G optic nerve; brain (or cerebral cortex)

(3) excessively convex; front; concave

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