being on the surface of the user's eye.

For a standard distance from the eye (b) of 28" (71.12 cm); this being the common length of an archer's draw:
:28" × 1 milliradian ? 0.028" (0.071 cm) -- stadia factor 1000
:10 milliradians ? 0.280" (0.711 cm) -- stadia factor x 100
:100 milliradians ? 2.80" (7.112 cm) -- stadia factor x10

The approximate range of an object one foot (30.48 cm) in height covering roughly 100 milliradians is 10 feet (3.048 m) or:
:Range (r) = approximate height of object (h)

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