Random Eye Musing

The dragonfly's head is mostly eye.  Each eye is made up of "30,000 facets, each of which is a separate light-sensing organ or ommatidium, arranged to give nearly a 360⁰ field of vision" (Red Planet, n.d.).

"The approximate field of view of a human eye is 95⁰out, 75⁰ down, 60⁰ in, 60⁰up.  About 12-15⁰temporal and 1.5⁰below the horizontal is the optic nerve or blind spot which is roughly 7.5⁰high and 5.5⁰wide" (Human eye, 2012).

I see better than either of these Calico Pennants, even though I have two lenses to each of their 60,000.

Nevertheless, I wonder what they see when they see me, as they clearly did when I snapped and snapped and snapped their mating wheel.

Sources

Human eye.  (2012, May 28).  Retrieved from http://en.wikipedia.org/wiki/Human_eye#Field_of_view

Red Planet Inc.  (n.d.).  Dragonflies of North America.  Retrieved from http://www.cirrusimage.com/dragonflies.htm