Word of the Day - Ommatidium

ommatidium

/ˌɒməˈtɪdɪəm/
noun
Entomology
Each of the optical units that make up the compound eye of an insect.

Origin
Late 19th century: modern Latin, from Greek ommatidion, diminutive of omma, ommat- ‘eye’.

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To get a good look at an ommatidium, one must use a good magnifying glass or a dissecting microscope. Flies care nothing for that, simply using their compound eyes to judge your swatting motion so they jump the opposite direction.