Why do flies have so many small eyes

In insects, it is called "compound eyes", and many insects have "compound eyes" that allow them to see enemies and food more clearly.

Because many insects have compound eyes, such as dragonflies.

The large fly is generally the mung bean fly, a species of fly that is widely distributed in most parts of the world, and is best known as the "mercerized green fly". The fly is slightly larger than the average housefly, with a round abdomen and a mung bean shape, and is used to be called a mung bean fly. The mung bean fly is 10-14 mm long, and its body has a shiny metallic hue, which is classified as blue-green or gold, with black markings.

Flies have 2 pairs of wings, and each pair of wings has 2 eyes, so flies have a total of 4 eyes.

So, flies have 4 eyes.

Flies have more than 400 eyes.

Flies have compound eyes for the following reasons:

Compound eyes allow flies to perceive subtle changes in their surroundings and help them identify the location of state dust and hazards. The structure of the compound eye allows the overlapping parts of adjacent units to be raised to provide a more comprehensive field of vision.

The fly's eye is made up of a number of small hexagonal structures. Each little hexagon is a small eye, which scientists call small eyes. In a fly's eye, there are more than 3,000 small eyes, and a pair of fly eyes have more than 6,000 small eyes.

This type of eye, which is made up of many small eyes, is called a compound eye.

The eyes of flies are insect eyes, also known as compound eyes. The compound eye is made up of a large number of small eyes. The small eye surface in the compound eye is generally hexagonal.

The number, size, and shape of the small eye surface vary greatly among various insects, and the compound eye of the male scale insect consists of only a few round small eyes. The compound eyes of houseflies are composed of 4,000 small eyes, and the compound eyes of butterflies and moths have 28,000 small eyes.

The compound eye, as opposed to the monocular, is the main visual organ of the insect and usually occupies a prominent position on the insect's head. Most insects have round, oval, or kidney-shaped compound eyes. It consists of a large number of small eyes.

Each eyelet has structures such as cornea, crystal vertebrae, pigment cells, retinal cells, and rods, and is an independent photoreceptor unit.

The fly's eyes are hemispherical, large and smooth, like two bright searchlights, taking up a large part of the head.

They are similar to the eyes of bees, they are also composed of many hexagonal small eyes, small eyes have a high temporal resolution, can divide moving objects into a continuous single lens, each small eye has a cornea and lens, coincidentally can be imaged separately, how many small eyes can form how many pictures at the same time, and then these pictures are combined in the brain of the fly, is a clear moving object image, even a very fast moving object can not escape the "magic eye" of the fly.

The fly's eye response + minutes are sensitive, and it can see ultraviolet rays that are invisible to the human eye, and it generally takes seconds for the human eye to see the outline of the object clearly, while the fly's eye only needs seconds. So scientists imitate the structure of the fly's eye and make a fly's eye camera with a honeycomb-like lens, which is made of several small lenses glued together, and the shooting has a high definition. In addition, there are many bionics of flies, people make small gas analyzers according to the sensitive antennae of flies, their hind wings will become a balance rod when flying, people apply this principle to the maintenance of stability of rockets and airplanes, as well as optical velocimeters, "ultraviolet eyes" and so on, which are the enlightenment that flies bring to human beings.