An ant's eye is a compound eye composed of hundreds of monocles, and each eye can only see a small part of the space, which together constitute an ant's complete field of vision. But the resolution of ants' compound eyes is much worse than that of humans, and the world in their eyes is much more blurred than ours. The world in people's eyes, 650 eyes and 150 compound eyes see the following scenes respectively. Biologists painted transparent nail polish on the compound eyes of dead ants, took them off after solidification, and obtained a "replica" of the eyes of ants. By counting the number and diameter of eyes, scientists estimate that the vision of ants is only110 of the average human vision.
Although the eyesight is almost "blind", ants have the ability of spatial perception and can move unhindered in various complex environments. In addition, the nest structure of ants is exquisite, extending in all directions, and the complexity is comparable to the huge project of human beings. All this shows that ants are not "two-dimensional creatures", but they do have the perception ability of three-dimensional space. However, it is still difficult for human beings with advanced technology to understand the concept of high-dimensional space due to cognitive limitations. There are many kinds of ants. The length of cattle ants in Australia can reach 8mm to 40mm, while that of thief ants is only1.5 mm. It is found that smaller ants have fewer eyes, lower spatial visual acuity and poor vision. Researchers have placed obstacles on the crawling path of homing ants. The results show that larger ants start to detour when they are 5 cm away from obstacles 17 cm, while smaller ants don't notice them until they are 5 cm away from obstacles.