Most species of snakes have relatively poor eyesight compared to humans and other animals that rely heavily on vision. However, the exact level of visual acuity varies depending on the species and their specific ecological niche. Some snakes, such as pit vipers, have specialized heat-sensing organs that allow them to detect prey and predators in complete darkness. Others rely more on their sense of smell and their ability to detect vibrations through the ground to navigate their environment and locate prey.