In the region outside the fovea, both types of cells were present. The more far-sighted the fovea was, the more rods were present and the fewer cones were present. Where the optic nerve leaves the retina (the nipple), blind spots form because there are no photoreceptors. According to the visual physiological characteristics and distribution characteristics of the two photoreceptors, color observation mainly uses the central area of the retina of the eyeball, that is, the field of view is smaller.
Usually through the object into our eyes there are three types of light: reflected light, transmitted light and emitted light, and we commonly see the sun, incandescent late astigmatism or daylight lights are white, they are composed of red, orange, yellow, green, blue, indigo, violet and other seven colors of light composite. When the white light hits the object, part of it is absorbed by the object, and the other part is reflected by the object, which is reflected light. Different objects will reflect different colors of light, some reflect red light, some reflect blue light, some reflect green light, these reflected light into our eyes, we see that some objects are red, some are blue, some are green, and the color of the object that does not reflect any light is black.
The color of the opaque body is determined by the color of the light it reflects. The object can reflect red light, and the hail is red. Black can absorb all color light so it is black.
The head color of a transparent body is determined by the color light it passes through, and red can only pass through red light, so it is red. White reflects all colors of light so it is white.
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