Table 1.

Demographic characteristics of subjects.

Age	25.6 (3.4) yrs, Range: 22–40
Sex	19F, 9M
Race	17W, 10A, 1B
RE OD	−1.93 (2.75) SED, Range: +1.50 to −10.75
RE OS	−1.82 (3.02) SED, Range: +3.50 to −11.00
Eyelid tension	11 Average, 7 Loose, 9 Tight, 2 Unspecified

Data presented as mean (standard deviation). Yrs: Years; F: Female; M: Male; W: White; A: Asian; B: Black; OD: Right eye; OS: Left eye; RE: refractive error; SED: Spherical equivalent diopters.