Orthetrum glaucum is an Asian dragonfly species, common across much of tropical and subtropical Asia. The common name for this species is blue marsh hawk. Wikipedia
All dragonfly species have excellent vision. Each compound eye is comprised of several thousand elements known as facets or ommatidiaDragonflies (and bees) have the largest compound eyes of any insect; each containing up to 30,000 facets, and the eyes cover most of the insect’s head GrrlScientist
Spotted at Dairy Farm Nature Park