Shift your gaze immediately to the blank wall. You should see a vivid inverted color image hovering in space. This is your afterimage.

An afterimage is the image that continues to appear in your eyes after exposure to the original image has ceased. You have likely experienced this when staring at a bright light or a colorful pattern and then looking away to see a "ghost" of the image. An is a software, exercise protocol, or visual tool designed to manipulate, extend, or utilize these afterimages to train visual memory, improve focus, and even aid in vision therapy.

Place the image at eye level one arm’s length away. Stare at the very center dot. Do not let your eyes saccade (jump). For 30 seconds, hold your gaze. Blink only if absolutely necessary.

A: The acute effect (seeing weird colors) lasts seconds. The long-term neural adaptation (better visual memory) lasts about 48 hours and requires daily practice to maintain.