An Eye of Horus fraction is one of the six unit fractions 1/2, 1/4, 1/8, 1/16, 1/32, and 1/64 conventionally associated with six parts of the
eye of the Egyptian god Horus. The corresponding powers-of-two fractions were used
for subdivisions of the hekat, an ancient Egyptian measure of capacity.
The values are labels assigned to the depicted parts, not quantities obtained from their lengths, areas, heights, or curvatures. Moreover, the historical origin of the familiar eye diagram is disputed. Ritter (2003) argues that the early hieratic capacity signs did not originate as pieces of the Eye of Horus and that the usual identification lacks firm ancient evidence. The later interpretation was encouraged by the myth in which the eye was broken into pieces and restored by the god Thoth.
