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Ho Soong Kim, Ki Ho Park, Jae Hoon Jeong, Joo Hyun Park, Kyu Hwa Roh, Jin Wook Jeoung, Seok Hwan Kim, Tae Woo Kim, Dong Myung Kim; Can We Measure the IOP When the Eyeball is Compressed on the Pillow in the Lateral Decubitus Position?. Invest. Ophthalmol. Vis. Sci. 2012;53(14):5073.
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We still do not know how much the intraocular pressure (IOP) elevates when we lie on the side with the eyeball compressed on the pillow. This study was performed to evaluate the amount of IOP change in the eye compressed on the pillow in the lateral decubitus position (LDP).
Thirty eyes from 15 healthy volunteers (12 men and 3 women) aged 29.27 ± 3.26 (range 25 - 37) years participated in this study. Using the rebound tonometer (Icare PRO, Icare Finland Oy, Helsinki, Finland), the IOP of both eyes was checked in sitting, supine, right and left LDP. In the LDP, the additional IOP measurements were done with the lower eyeball compressed on the latex pillow. In each measurement the IOP was checked both immediately after the position change and 10 minutes after maintaining the changed position.
Baseline IOP in the sitting position was 12.73 ± 1.94 mm Hg in right eye and 12.75 ± 2.20 mm Hg in left eye. Ten minutes after shifting from the sitting to the supine position, IOP increased significantly (right eye: +1.43± 1.44 mm Hg, p = 0.006; left eye: +1.83 ± 1.49 mm Hg, p = 0.001). Changing from the supine to the right and left LDP increased significantly the IOP of dependent eye after 10 minutes (right eye: +2.25 ± 1.83 mm Hg, p = 0.001; left eye: +1.47 ± 1.77 mm Hg, p = 0.011). When the dependent eye was compressed on the pillow in the LDP, the IOP of the dependent eyes increased significantly after 10 minutes (right eye in the right LDP: +4.06 ± 4.86 mm Hg, p = 0.011; left eye in the left LDP: +3.40 ± 3.69 mm Hg, p = 0.006). The final IOP was 20.47 ± 4.89 mm Hg in the compressed right eye in the right LDP and 19.43 ± 3.88 mm Hg in the compressed left eye in the left LDP.
The IOP was significantly elevated when the eyeball was compressed on the pillow in the LDP. This phenomenon may partially explain the mechanism of the optic nerve damage in normal tension glaucoma.
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