In order to understand how we can see things in the daytime when there is no darkness, it's important to clarify the concept of darkness and its relationship with light.
Darkness, in a strict sense, is the absence of light or the absence of sufficient light for our eyes to perceive objects clearly. However, even during the daytime, when the sun is illuminating our surroundings, there are still variations in the intensity of light.
Our ability to see objects relies on the presence of contrasting light levels. In a well-lit environment, such as during the daytime, light from the sun or other light sources allows us to perceive objects. The light reflects off objects and enters our eyes, where it is detected by specialized cells called photoreceptors in the retina. These photoreceptors convert the incoming light signals into electrical signals, which are then transmitted to the brain for interpretation.
While it may be true that we do not experience darkness during the daytime, the perception of objects and their details is possible due to differences in the amount of light reflected from various surfaces. Objects reflect and scatter light differently based on their properties. This variation in the reflection and scattering of light creates contrasts and shading, allowing our eyes and brain to discern shapes, colors, and textures.
In summary, our ability to see things during the daytime is not dependent on the presence of darkness. Rather, it is based on the presence of contrasting light levels and the interaction of light with objects, enabling our visual system to detect and interpret the information provided by the light.