Life Cycle of House Flies. Lesser House Flies. House Fly Problems. House Fly Larvae. House Fly Eyes. House Flies and Disease. Connect with Us Our customer care team is available for you 24 hours a day. The effect is much like how we see stippling or newspaper print -- up close the image is a lot of tiny dots, but take a step back and it's a complete image. The more ommatidia a compound eye contains, the clearer the image it creates. There's a reason why flies are especially jumpy creatures that take off at the slightest flinch.
A fly's vision is nowhere near as clear or effective as a human's, but it's especially good at picking up form and movement. As an object moves across the fly's field of view the ommatidia fire and stop firing. This is called a flicker effect. It's similar to how a scrolling marquis works -- with lights turning on and off to give the illusion of motion.
Because a fly can easily see motion and form, but not necessarily what the large moving object is, they are quick to flee, even if the moving object is harmless. Flies have limited color vision. Each color has its own wave frequency, but flies have only two kinds of color receptor cells.
This means they have trouble distinguishing between colors, for instance discerning between yellow and white. Insects cannot see the color red, which is the lowest color frequency humans can see. However, houseflies have the ability to see polarized light, but humans cannot differentiate between polarized and unpolarized light. Polarized light is light in which the waves travel only in one plane.
The explanation turns out to be steeped in Physics and Biochemistry, and both are languages that the BugLady spoke briefly, a long time ago, and not well. Many insects have two kinds of eyes — simple and compound all insects with compound eyes have simple eyes, but not all insects with simple eyes have compound eyes.
Ocelli detect motion and light including UV light but do not transmit images. Most insects have one to three of these simple eyes, and insects that spend a lot of time on the wing have larger ocelli.
The eye of an insect that lives in the dark in the soil may have fewer than 25 ommatidia, and a single eye of a Common Green Darner has 28, As with human eyes, information from each eye is resolved into a single image in the brain right-side-up, in the case of insects. Different visual needs — nocturnal vs diurnal; predator vs prey, aquatic vs terrestrial, landlubber vs aerialist — require different numbers and sizes of ommatidia your Scrabble game is improving already!
In fly species with gigantic eyes, an acute zone makes him more far-sighted, equipping him to recognize a female of the species before she can even see him!
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