Repeatability and Effects of Sequential Measurements with POBF Tonograph

Abstract

If IOP measurements have to be repeated using the POBF Tonograph, they are best done after an interval of at least 2 minutes and preferably after 15 minutes. Use of the POBF Tonograph had no significant immediate effect on the IOP or POBF values obtained from a fellow eye.

Clinical Evaluation of Methods to Correct Intraocular Pressure Measurements by the Goldmann Applanation Tonometer, Ocular Response Analyzer, and Corvis ST Tonometer for the Effects of Corneal Stiffness Parameters

“…38 Clinical studies to quantify the effects of corneal stiffness (which varies with corneal thickness, curvature, age, and medical history) started >50 years ago, and concentrated on the thickness for being the most prominent stiffness parameter. 39 Using both clinical data and mathematical modeling, the studies estimated errors in GAT-IOP within the wide range of 0.7 to 7.1 mm Hg for a change in CCT of 100 mm. 3,7-11 Similar work has shown a similar effect of CCT on IOP readings by ORA and CVS, with IOP being underestimated in thin corneas and overestimated in thick corneas.…”

Pulsatile ocular blood flow: relationship with flow velocities in vessels supplying the retina and choroid

“…[9][10][11][12][13][14] Despite wide interindividual variation, the technique is characterised by excellent reproducibility. [15][16][17] In healthy adults, mild systemic hypoxia did not alter POBF, suggesting that global pulsatile choroidal blood flow was not vulnerable to mild transient hypoxia. 18 It has been reported that POBF readings are not altered by the Valsalva manoeuvre (unlike IOP) in healthy subjects.…”

Ocular blood-flow hemodynamics before and after application of a laser in situ keratomileusis ring

“…This finding is also unsurprising because a reduction in IOP recorded during sequential tonometry has been recorded during POBF measurements 25 and Goldmann applanation tonometry. 26 During microkeratome application, IOP increased to a mean 88.9 G 2.3 mm Hg.…”