How do scientists observe flies and make fly-eye cameras?

The cameras we usually use can only take one photo when we press the shutter button, but have you heard of a camera that can take more than a thousand high-definition photos at a time? Yes, it is a fly-eye camera! The fly-eye camera was invented by humans based on the structure of the fly's eye. Human eyes are spherical, but through research, people have found that fly eyes are hemispherical like honeycombs, and fly eyes are compound eyes composed of thousands of small eyes, which are very different from human eyes.

Fly eyes do not have eyeballs, eye sockets and eyelids, and fly eyes cannot rotate. The fly has to turn its body and neck to turn its eyes towards the object, but the fly's viewing angle range is much larger than that of humans. If a person's head remains still, the eyes will certainly not be able to see what is behind the body. However, a fly's eyes can see almost 360 degrees. Only a very narrow area on the back of the head cannot be seen. Each ommatidium in the fly's eye is equivalent to an independent camera, which can produce different images independently, because each ommatidium has an imaging system composed of cornea and crystal vertebrae, pigment cells, retinal cells, and rods.

Scientists once conducted experiments where they cut off the cornea of ??a fly's eye and took pictures under a microscope. Hundreds of identical photos could be taken at once. Do you think fly eyes are magical? In fact, there are many animals with compound eyes in the world. Nearly a quarter of animals see with compound eyes, such as the familiar dragonflies, bees, fireflies, etc.