Eyes

• Compound eyes 

   located on each side of the head of most adult insects, which consist of many hexagonal elements known as facets or ommatidia
• Simple eyes or ocelli (singular: ocellus)

  are three simple lenses located between the compound eyes on top of the head, typically arranged in an isosceles triangle; for light detection and are not designed for high resolution vision
• Lateral or posterior ocelli

  found between the eyes and above the bases of the antennae
• Anterior or median ocellus

   antero – ventral to the lateral ocelli and between the antennal bases