Open this publication in new window or tab >>Show others...
2022 (English)In: African Vision and Eye Health, ISSN 2413-3183, E-ISSN 2410-1516, Vol. 81, no 1, article id a691Article in journal (Refereed) Published
Abstract [en]
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 noncontact tonometer and compare with Goldmann, PT-100 and Schi⊘tz 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 Schi⊘tz 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 Schi⊘tz tonometer-measured IOP was higher than the Goldmann IOPs (p < 0.05) with 60% and 44% of Schi⊘tz 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 Schi⊘tz tonometer. The mean CCT (552±36 µm) was negatively correlated with differences between Goldmann and both PT-100 and Schi0tz-measured IOP.
Conclusion: Postural changes did not affect the validity and repeatability of PT-100 readings. PT-100 measurements were interchangeable with Goldmann tonometer. Schi⊘tz overestimated Goldmann IOP in thicker corneas more than the PT-100.
Place, publisher, year, edition, pages
AOSIS, 2022
Keywords
glaucoma, Goldmann applanation tonometer, intraocular pressure, non-contact tonometer, posture, repeatability
National Category
Ophthalmology
Identifiers
urn:nbn:se:umu:diva-194540 (URN)10.4102/aveh.v81i1.691 (DOI)000836331900002 ()2-s2.0-85128874639 (Scopus ID)
2022-05-092022-05-092023-09-05Bibliographically approved