If you take a red pencil and start moving it to the side of the eyes (you need to look at this time directly in front of you); when the image of the pencil hits the edge of the retina, where the sticks are concentrated, the pencil appears to be black. The yellow pencils will appear light gray. The shape of the object, its movement will be reproduced accurately, but the color will not be perceived.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.