Visual Acuity: Humans have significantly sharper vision than dogs. Normal human vision is 20/20, meaning clear sight at 20 feet. Dogs typically have 20/75 vision, meaning they must be 20 feet from an object to see it as clearly as a human can at 75 feet. This makes dogs' vision appear blurry, especially for distant or fine details.

Color Perception: Humans are trichromatic, with three types of cones detecting red, green, and blue, allowing us to see millions of colors. Dogs are dichromatic, with only two cone types—sensitive to blue and yellow-green. They cannot distinguish reds and greens, which appear as varying shades of yellow or gray.

Field of View: Dogs have a much wider field of view—about 240° to 250°—compared to humans' 180°.
This allows dogs to see more of their surroundings at once, especially in peripheral vision, aiding in detecting movement and potential threats.

Night Vision & Motion Detection: Dogs excel in low-light conditions due to a higher number of rods (light-sensitive cells) and a reflective layer called the tapetum lucidum, which enhances night vision.
They can see in about one-quarter the light humans need. Dogs also detect motion far better than humans, with motion sensitivity up to 10–20 times greater, especially in dim light.

Depth Perception: Humans have better depth perception due to greater binocular overlap (140°) from front-facing eyes. Dogs have less overlap (~100°), resulting in reduced depth perception, though they can still judge distances well enough for daily activities.

In summary, human vision is superior in sharpness, color range, and depth perception, while dog vision excels in peripheral awareness, motion detection, and low-light performance—each adapted to their evolutionary roles as hunters and companions.