IN A PREVIOUS ARTICLE,1 WE FOUND THAT ELEVATION of asymmetric intraocular pressure (IOP) in the lateral decubitus position was associated with asymmetric visual field (VF) loss in patients with glaucoma. We also found that the number of patients preferring the worse-eye-dependent lateral decubitus position was significantly higher than that of patients preferring the better-eye-dependent lateral decubitus position; the better eye and the worse eye were defined based on the mean deviation value determined by Humphrey visual field analysis. In considering these results, we speculated that preferred sleep position, with postural IOP, might be a contributory factor to glaucoma manifestation. So in the present study, we endeavored to verify our hypothesis concerning the association between preferred sleep position and asymmetric VF loss in a larger subject group.
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