Effects of corneal thickness on intraocular pressure measured with three different tonometers

Abstract

For measurements of IOP in normal eyes, the GAT is the tonometer least affected by the CCT, compared with the PNCT and NCT. A PNCT is more likely to be affected by variations in CCT than the GAT.

Purinergic dysregulation causes hypertensive glaucoma–like optic neuropathy

“…CCT measurement revealed that P2Y 6 KO mice showed thicker CCT at middle age. Many reports have suggested that IOP is positively correlated to CCT (67)(68)(69)(70)(71)(72)(73)(74)(75). Our present data demonstrated that mature adult P2Y 6 KO Figure 6.…”

Effect of the Honan intraocular pressure reducer on intraocular pressure increase following intravitreal injection using the tunneled scleral technique

“…The Schiotz tonometer has some limitations in that the results are dependent on ocular rigidity, corneal thickness, and corneal pathology [22,23]. However, Chiara et al [24] report that the Schiotz tonometer correlates well with Goldmann applanation tonometry, which is the standard.…”

Air-Puff Tonometry in population research – a comparison with Goldmann tonometer in individuals with suspected ocular hypertension

“…Recent research found that corneal resistance to applanation is the main predictive factor for matching the measurements obtained with different tonometers (17) , and the values obtained with TG and TA suffer the same type of variation due to both tonometers being dependent on the same mechanism of IOP measurement (9) . However, because it is a populational and screening study, pachymetry of the cornea was not part of the propaedeutics.…”

“…A limiting factor of the study was the lack of assessment of corneal thickness, since there are differences between the methods dependent on the corneal thickness and curvature (8,9) . Recent research found that corneal resistance to applanation is the main predictive factor for matching the measurements obtained with different tonometers (17) , and the values obtained with TG and TA suffer the same type of variation due to both tonometers being dependent on the same mechanism of IOP measurement (9) .…”

“…The reliability of the IOP measures with TG and TA is knowingly influenced by the curvature and the central corneal thickness. These parameters could influence more measures with TA (8) , but there is no consensus about it (9) . The TA helps the examination of children in field projects or in population studies due to the relative speed and convenience during the exam, since there is no use of fluorescein eyedrops and topical anesthetic, required when using TG.…”