A study published in Acta Ophthalmologica examined the effect of pillow pressure on intraocular pressure (IOP) in 11 patients with primary open-angle glaucoma and 11 healthy volunteers. In the simulated sleep position, when participants turned their heads into the pillow, the estimated IOP in the inferior eye increased significantly—an average of 19.6 mm Hg in glaucoma patients and 28 mm Hg in controls. This increase was clinically significant and could lead to harmfully high IOP values during sleep, contributing to the progression of glaucomatous damage. The use of protective glasses placed on the edge of the orbit significantly reduced this increase - IOP decreased by 16.3 mm Hg in glaucoma patients and by 25.1 mm Hg in the control group. Pressures were measured with an epi-palpebral sphygmomanometer attached to the lid of the right eye. The study suggests that goggles may be a treatment option to prevent IOP spikes caused by external pillow pressure during sleep.[1][2][3]