What adaptation do whales have for having a good eyesight?

Whales have evolved several adaptations for good eyesight, particularly in low-light underwater environments. Their eyes have a large lens and a high concentration of rod cells, which enhance their ability to see in dim light. Additionally, many species possess a reflective layer behind the retina, called the tapetum lucidum, which improves vision in dark waters by reflecting light that passes through the retina back into their photoreceptor cells. These adaptations help whales navigate and hunt effectively in their aquatic habitats.