Persistence of Vision:

Definition: Persistence of vision refers to the phenomenon where the human eye retains an image for a fraction of a second even after it has been removed from the field of view. This persistence allows us to perceive motion and create the illusion of continuous images.

How does it work?
- When we look at an object, the light reflected from it enters our eyes and falls on the retina, which contains light-sensitive cells called photoreceptors.
- These photoreceptors convert the light into electrical signals that are sent to the brain for processing.
- The brain processes these signals and interprets them as visual information, creating the perception of an image.
- However, the photoreceptors do not instantly reset after exposure to light. They retain their sensitivity for a short time, resulting in a temporary afterimage.

Key Points:
1. Retention of Image: Persistence of vision allows the human eye to retain an image for a short duration, even after the image is no longer present in the field of view.
2. Perception of Motion: This phenomenon is crucial for perceiving motion. By rapidly displaying a sequence of still images, the brain combines them to create the illusion of continuous motion.
3. Frame Rate: The perception of smooth motion is influenced by the frame rate at which images are presented. Higher frame rates result in smoother motion.
4. Film and Animation: Persistence of vision is fundamental in film and animation industries. Movies are created by displaying a rapid succession of individual frames, each slightly different from the previous one, to create the illusion of movement.
5. LED Displays: Modern LED displays utilize the persistence of vision to create the illusion of continuous images. By rapidly cycling through different LEDs, they give the impression of a static image or video.

Conclusion:
Persistence of vision is a phenomenon in which the human eye retains an image for a fraction of a second, allowing us to perceive motion and create the illusion of continuous images. It plays a crucial role in various fields such as film, animation, and LED displays. Understanding persistence of vision helps in designing visually appealing and seamless visual experiences.