Fig. 2.

Measurements of the eyelid and eyebrow parameters by the ImageJ (NIH, Bethesda, Md.) software. The radius of the cornea was used as a standard scale of 5.5 mm (A). The following parameters were measured and analyzed: (1) the eyelid MRD of the upper (MRD-1) and lower (MRD-2) eyelids; (2) EBH, measured as the vertical distance from the center of the eyebrow to the pupil center (B); (3) OSA, calculated automatically by the software following the delineation of the eyelid margins manually (C). If the upper eyelid covered the corneal light reflex, the putative center of a circle overlapping the corneal limbus was deemed as the corneal light reflex. Then the MRD-1 was measured and expressed as a negative value.