1. Man-made product: Engineers have developed an artificial compound eye that fits 8,500 lenses into a space the size of a pinhead.

2. Apposition eyes were almost certainly the original type of compound eye and are the oldest fossil eyes known, identified from the trilobites of the Cambrian Period

3. Apposition eye definition is - a compound eye that is characteristic of diurnal insects and in which entering light reaches the retina of each ommatidium as a …