Effects of postural changes on measured intraocular pressure and repeatability of PT-100 tonometer and agreement with applanation and indentation tonometry

Background: Repeatability and validity are important components of precision in any measurement system. Aim: This study aimed to determine the effect change head neck position body posture on repeatability intraocular pressure (IOP) measurements with PT-100 non-contact tonometer compare Goldmann, Schiøtz readings. Setting: Optometry clinic, Saudi Arabia. Methods: The IOP was measured one selected eye 84 healthy participants (mean aged 21.9 ± 2.0 years) using three positions, Goldmann two separate visits, a randomised fashion. Central corneal thickness (CCT) an ultrasound pachymeter. repeatability, agreement correlations between CCT differentials were assessed. Results: positions similar comparable IOPs sessions 74% 86% within ±3 mmHg tonometry, respectively, for two. tonometer-measured higher than ( p < 0.05) 60% 44% two, respectively. limits reproducibility best worst tonometer. mean (552±36 µm) negatively correlated differences both Schiøtz-measured IOP. Conclusion: Postural changes did not affect interchangeable overestimated thicker corneas more PT-100.