House fly eyes are complex organs that are comprised of thousands of individual lenses. Compound eyes are able of detecting both the polarization of light and color spectrums that are unseen by humans.
House fly eyes can know even the least movements in a full, 360-degree spectrum. This allows the housefly to see a distant wider range, as well as detect and react to movement at a faster pace than species with the simple eyes. This is the reason that it is very difficult to hit a housefly. One method that may prove successful is to hit at the fly simultaneously with two objects: this perplexes the receptors of the housefly.
Houseflies are scrupulous in their grooming, mostly around their eyes. These are using their forelegs to remove any fabric that has come into contact with the eyes.
