Spider eyes are specialized organs that allow spiders to see their surroundings. Most spiders have eight eyes, but the number can vary from six to two, depending on the species. These eyes are typically arranged in specific patterns on the spider's head, which helps them detect movement and judge distances. Unlike human eyes, spider eyes do not have eyelids and cannot move. Instead, they rely on their ability to detect light and motion. Some spiders, like jumping spiders, have excellent vision and can see in color, while others, like web-building spiders, have poorer eyesight but are highly sensitive to vibrations.