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sight
Vision is a physiological vocabulary.
The feeling that the image of an object stimulates the eyes (retina).
Light acts on the visual organs, which excites their sensory cells, and its information is processed by the visual nervous system to produce vision.
People and animals perceive the size, brightness, color and movement of external objects through vision, and obtain all kinds of information that is of great significance to the survival of organisms. At least 80% of external information is obtained through vision, and vision is the most important feeling for people and animals.
Formation process
Light → cornea → pupil → lens (refracting light) → vitreous body (fixing eyeball) → retina (forming object image) → optic nerve (transmitting visual information) → brain visual center (forming vision).
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visual angle
The opening angle of the human eye to both ends of the object
Angle of view, the angle formed by the line of sight and the vertical direction of the display, etc. , and when observing an object, the angle formed by the light emitted from both ends of the object (up, down or left and right) at the center of the human eye. The smaller the size of the object, the farther away from the observer, and the smaller the viewing angle. The minimum visual angle that normal eyes can distinguish two points on an object is about 1 point.
The angle between the line of sight and the vertical direction of the display, etc. The reflection of the screen is different in all directions. The farther away from the center of the screen in the horizontal direction, the lower the brightness. The viewing angle when the brightness drops to 50% is defined as the viewing angle.