Hi Lyston,
You seemed to be having a problem with distinguishing between different types of compound eyes?
May I suggest that you read the following web resource on Trilobite Eyes?
The Trilobite Eye
As you can see there are
three distinct types of Trilobite compound eyes.
Read carefully and you'll see that each type is constructed differently.
In addition each type of compound eye in Trilobites had tremendous variation in form and size.
Hope this helps?
Cheers