Effects of postural changes on measured intraocular pressure and repeatability of PT-100 tonometer and agreement with applanation and indentation tonometry
African Vision and Eye Health
| Field | Value | |
| Title | Effects of postural changes on measured intraocular pressure and repeatability of PT-100 tonometer and agreement with applanation and indentation tonometry | |
| Creator | Tairi, Ahmed I. Ogbuehi, Kelechi C. Zafar, Hamayun King, Matthew D. Obinwanne, Chukwuemeka J. Mashige, Khathutshelo P. Osuagwu, Uchechukwu L. | |
| Description | Background: Repeatability and validity are important components of precision in any measurement system.Aim: This study aimed to determine the effect of change in head and neck position and body posture on the repeatability of intraocular pressure (IOP) measurements with PT-100 non-contact tonometer and compare with Goldmann, PT-100 and Schiøtz tonometer readings.Setting: Optometry clinic, Saudi Arabia.Methods: The IOP was measured in one selected eye of 84 healthy participants (mean aged 21.9 ± 2.0 years) using PT-100 in three head and body positions, Goldmann tonometer and Schiøtz on two separate visits, in a randomised fashion. Central corneal thickness (CCT) was measured using an ultrasound pachymeter. The repeatability, agreement and correlations between CCT and IOP differentials were assessed.Results: The IOP measured in three head and body positions with the PT-100 were similar and comparable to Goldmann IOPs in sessions one and two with 74% and 86% of PT-100 measurements within ±3 mmHg of the Goldmann tonometry, respectively, for sessions one and two. The Schiøtz tonometer-measured IOP was higher than the Goldmann IOPs (p 0.05) with 60% and 44% of Schiøtz IOPs within ±3 mmHg of the Goldmann tonometer IOP in sessions one and two, respectively. The limits of repeatability and reproducibility were best with the PT-100 and worst with the Schiøtz tonometer. The mean CCT (552±36 µm) was negatively correlated with differences between Goldmann and both PT-100 and Schiøtz-measured IOP.Conclusion: Postural changes did not affect the validity and repeatability of PT-100 readings. PT-100 measurements were interchangeable with Goldmann tonometer. Schiøtz overestimated Goldmann IOP in thicker corneas more than the PT-100. | |
| Publisher | AOSIS | |
| Date | 2022-03-24 | |
| Identifier | 10.4102/aveh.v81i1.691 | |
| Source | African Vision and Eye Health; Vol 81, No 1 (2022); 9 pages 2410-1516 2413-3183 | |
| Language | eng | |
| Relation |
The following web links (URLs) may trigger a file download or direct you to an alternative webpage to gain access to a publication file format of the published article:
https://avehjournal.org/index.php/aveh/article/view/691/1765
https://avehjournal.org/index.php/aveh/article/view/691/1766
https://avehjournal.org/index.php/aveh/article/view/691/1767
https://avehjournal.org/index.php/aveh/article/view/691/1768
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