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Hyo Jong Cho, Byung-ju Choo, Jae Suk Kim, Mi Sun Sung, Jin Choi, Joo Hwa Lee; The Measurement of the Intraocular Pressure and Anterior Chamber Depth in the Normal Eye with Changes of the Posture. Invest. Ophthalmol. Vis. Sci. 2011;52(14):682.
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The anterior chamber depth and intraocular pressure changes in normal eyes according to changes of the posture were investigated in this study.
Forty eight eyes in 48 healthy male subjects were enrolled. None of the subjects had any systemic or ophthalmologic disorders. The crystalline lens thickness, the central anterior chamber depth, the axial length and the intraocular pressure were measured 10 minutes after each position (upright, sitting, supine and prone positions) by using A-scan ultrasonography and TonoPen. The data was analyzed with statistical methods.
There was a significantly positive correlation of the axial length and the central anterior chamber depth among the positions (P<0.01), and for the intraocular pressure among the positions, except for the prone position. The mean intraocular pressure was 19.68±2.15mmHg in the prone position, 17.19±1.33mmHg in the supine position, 16.49±1.76mmHg in the sitting position and 15.33±1.34mmHg in the upright position. The difference among the positions was statistically significant (P<0.01). The mean central anterior chamber depth was 3.68±0.35mm in the upright position, 3.63±0.32mm in the supine position, 3.59±0.34mm in the sitting position and 3.47±0.30mm in the prone position. The difference among the positions was statistically significant (P<0.01) except for the difference between the supine position and the sitting position. There was a significantly negative correlation between the crystalline lens thickness and the central anterior chamber depth in all the positions. Simple linear regression analysis revealed that the central anterior chamber depth was significantly correlated with the intraocular pressure in the prone position (R square: 0.139, P<0.01).
There was a significant change in the central anterior chamber depth and the intraocular pressure of the normal eye as the posture changed, and the central anterior chamber depth was significantly correlated with the intraocular pressure only in the prone position.
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