Table 1.

 Pupil size and upper lid level changes (SD) (mm) of the groups

Variable (mm)	OSP group (n = 31)			Control group (n = 54)
	Baseline (range)	Apraclonidine (range)	p Value	Baseline (range)	Apraclonidine (range)	p Value
PS	2.33 (0.47) (2–4)	4.38 (1.06) (3–8)	<0.001	3.09 (0.70) (2–4.5)	2.94 (0.54) (2–4.5)	<0.05
PD	2.04 (0.83) (1–4.5)			−0.14 (0.45) (−1–0.5)		<0.001
Ptosis	1.35 (0.75) (0–3)	−0.40 (0.89)* (0– (−3))	<0.001	0.19 (0.51) (0–2)	−0.41 (0.79)* (0–(−3))	<0.001
LR	1.75 (1.00) (0–4)			0.61 (0.82) (1–3)		<0.001

PS, pupil size; PD, pupil difference; LR, lid retraction.

*Retraction with respect to the presumed normal upper lid level.