Naked eye
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Naked eye, also called bare eye or unaided eye, is the practice of engaging in visual perception unaided by a magnifying, light-collecting optical instrument, such as a telescope or microscope, or eye protection.
The Milky Way is visible over the Very Large Telescope, demonstrating clear atmosphere above Paranal Observatory.
Visual perception
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Visual perception is the ability to interpret the surrounding environment through photopic vision, color vision, scotopic vision, and mesopic vision, using light in the visible spectrum reflected by objects in the environment. This is different from visual acuity, which refers to how clearly a person sees. A person can have problems with visual perceptual processing even if they have 20/20 vision.
Leonardo da Vinci: The eye has a central line and everything that reaches the eye through this central line can be seen distinctly.
Eye movement first 2 seconds (Yarbus, 1967)