Insects have what is called a Compacted Eye.
This eye is made out of hundreds maybe thousands of tiny little eyes. Each of these eyes sees and then sends it's own message to the insects brain.
We aren't really sure why GOD did it this way but He did.
Some insects also have what is called a Ocelli Eye. It is such a basic eye that it can only tell light from dark.
|This is what a compacted eye sees.|
|Sorry about the fly. I found the most attractive picture that I could.|
Some insects have these in only one stage of their life and others will have it there entire life.