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J. Uehara, T. Sugawara, S. Yamamoto; Intraocular Pressure Changes After Posture Change Measured With a Rebound Tonometer. Invest. Ophthalmol. Vis. Sci. 2008;49(13):1048.
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The results of earlier studies suggested that the changes in the intraocular pressure (IOP) after posture changes are different between normal subjects, glaucoma patients who had undergone trabeclectomy, and those receiving latanoprost. To confirm these observations, we examined the IOP changes with a rebound tonometer after a posture change in glaucoma patients without treatment, those treated with latanoprost, those who had undergone trabeculectomy, and those who had undergone cataract surgery.
The IOP changes were measured with a rebound tonometer (iCare) immediately after a change from the sitting position to a lateral-recumbent position in 136 eyes of 68 glaucoma patients and 10 normal volunteers. Among the 136 glaucoma eyes, 13 eyes received no treatment, 72 eyes were treated with latanoprost, 32 eyes had had trabeculectomy, and 19 eyes had had cataract surgery.
The mean increase in the IOP after the posture change was 2.05 ± 1.40 mmHg in normal volunteers and 2.22 ± 2.19 mmHg for all the glaucoma patients (P>0.05). The IOP changes were significantly smaller in patients who had trabeculectomy than those who had not (P<0.05). There was no significant difference between patients treated with latanoprost and those who had not, between patients who had cataract surgery and those who had not, and between patients younger than 65-years-old and those older.
The smaller increase of the IOP after posture a change in glaucoma patients who had undergone trabeculectomy was confirmed by a rebound tonometer. The rebound tonometer is a useful tool to measure IOP changes in a routine clinical setting.
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