eye-to-bag ratio

Eye-to-bag ratio, symbol ξ, is defined such that

ξ = h(eye)/h(eye bag) = k*beauty

where h is a function of height,
h(eye) is the height of an individual's open eye,
h(eye bag) is the visible height of the eye bag, and

k is a nonzero arbitrary constant. Rearranging the equation gives:

beauty ∝ξ

Evidence suggests that when
- h(eye) is high and/or
- h(eye bag) is low,
ξ (eye-to-bag ratio) is large and thus, under a constant k condition, beauty of the individual yielding the calculated ξ is also large.