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Diurnal Variation of Intraocular Pressure in Suspected Normal-Tension Glaucoma

Abstract

Purpose

To assess diurnal variations of intraocular pressure (IOP) in suspected normal-tension glaucoma (NTG) patients with subsequent long-term observation to detect changes that may lead to a new diagnosis.

Methods

Diurnal variation of IOP was measured in a sitting position at 2-h intervals for 24 h in a total of 569 subjects with suspected NTG.

Results

Thirty of the 569 subjects (5.3%) showed IOP values exceeding 20 mmHg during the 24-h monitoring and were diagnosed as having primary open-angle glaucoma (POAG). In subjects in whom NTG was definitely diagnosed based on the results of the 24-h monitoring, the average maximum, minimum, and mean IOP was 16.1, 11.7, and 13.9 mmHg, respectively, and the mean diurnal variation in IOP was 4.4 mmHg. The peak time was observed outside clinic hours (1800–0800) in 41.4% of patients, and the trough time was observed during clinic hours (1000–1600) in 15.9%. In 2.9% of NTG subjects, the diagnosis was eventually changed to POAG during follow-up.

Conclusion

Assessment of diurnal variations of IOP in suspected NTG patients is useful for the differential diagnosis of POAG from NTG and for establishment of a baseline, which may affect the management plan. Jpn J Ophthalmol 2006;50:449–454 © Japanese Ophthalmological Society 2006

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Hasegawa, K., Ishida, K., Sawada, A. et al. Diurnal Variation of Intraocular Pressure in Suspected Normal-Tension Glaucoma. Jpn J Ophthalmol 50, 449–454 (2006). https://doi.org/10.1007/s10384-006-0343-z

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  • DOI: https://doi.org/10.1007/s10384-006-0343-z

Key words

  • diurnal variations
  • intraocular pressure
  • normal-tension glaucoma