Which Eyes Do Spiders Have?
WouterArachnids like spiders, flies and bees have two types of eyes. The primary eyes are the ones that form an image of the world around them. The secondary eyes help spiders detect motion and depth perception information. Generally, the primary eyes are large and have good resolution. The secondary eyes are usually smaller and are placed in the front or on the sides of the head.
Some spiders have the ability to recognize the direction of light and also respond to changes in light and dark intensity. This is a good tool for hunting at night. They are also able to pick out details, and some even have polarised eyes to navigate through the light.
In addition to the four pairs of main eyes, most arachnids have up to three pairs of secondary eyes. The second set of eyes is designed to move independently of the primary ones. The tapetum lucidum is usually present behind these secondary eyes to reflect light.
Wolf spiders have specially designed eyes that glow when they are exposed to light. These eyes are sensitive to low light levels, and they are especially active during dusk and night. They also have four large posterior eyes that give them a good advantage in dim light conditions.
They have an optical system that’s better than most animals. They can detect the movements of other predators and they can focus on their prey. They can also track their own body movements and judge the distance between themselves and their prey.
