In fact, in order to adapt to daytime light, we and lizards have the same visual structure, that is, cones are scattered all over the retina. This is a type of cell that is built for strong light and is commonly found in the eyes of diurnal vertebrates, such as most birds, monkeys, turtles, and some lizards. But the ancestors of geckos turned to night life because they were too competitive during the day, so the cone cells in their eyes evolved into rod cells that are more suitable for night life, and their functions are very similar to "normal" rod cells. So it is almost certain that geckos evolved from diurnal lizards, but after becoming "geckos", they all became nocturnal animals.