How do I not see something

Visual process

The light that hits the eye, regardless of whether it emanates directly from a light source or is reflected from objects, reaches the retina through the cornea, lens and vitreous humor and is perceived there by the rods and cones. The signals generated in this way are passed on to the brain via the optic nerve and processed there as a sensory impression. Our ability to see things clearly near and far is related to the fact that the curvature of the lens can change. If you look into the distance, the curvature of the lens is relatively flat; if you look closer, the curvature becomes more pronounced. So we cannot see both near and far at the same time; our brain controls the curvature of the lens in fractions of a second without any further action, so that we normally do not notice this.

Spatial vision requires seeing with both eyes. The brain can determine the position in space through the angle of the visual axes of the two eyes.

With normal lighting, a healthy human eye can distinguish up to 100,000 color nuances.

Color vision

The cones are stimulated to different degrees by the different wavelengths of light. Depending on the primary valences and their intensity, a different type of cone is stimulated. These more or less strong stimuli evoke the sensory impression "color" with all possible nuances in the brain.

If the ambient light decreases, the cones gradually lose their effect. The rods, which are more sensitive to light and therefore still respond in low light, continue to send impulses to the brain. When the light fades, the signals for red, green and blue decrease one after the other. Yellow is the longest time to differentiate itself from gray. For this reason, yellow is an ideal signal color.

In the dark, we can hardly see objects that we fix with the eye, because the yellow spot, i.e. the point on the retina with the greatest visual acuity, only contains color-sensitive cones that can only fully recognize colors in daylight. If we do not fix the observed object exactly, we can see it better in the dark, because the more light-sensitive rods from the peripheral areas of the eye are stimulated.

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