Describe the operation of the visual sensory system: the passage of the light beam in the eyeball, the display of the image on the retina and the formation of the visual image. Give four rationales for the processes.
1) The passage of the light ray in the eyeball: On the way to the photosensitive shell of the eye – the retina – light rays pass through several transparent surfaces – the cornea, crystalline lens and vitreous body. The different curvatures and refractive indices of these surfaces determine the refraction of light rays inside the eye.
2) Light stimulates the visual receptors of the retina – rods and cones.
3) Excitation along the optic nerve is transmitted to the visual zone of the cerebral cortex.
4) The image is analyzed in the visual zone of the cerebral cortex and is perceived by a person in its real reflection
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