A comparison of NCT, Goldman application tonometry values with and without fluorescein

Abstract

PurposeThe aim of the study was to statistically compare intraocular pressure (IOP) values measured using noncontact tonometer (NCT), Goldmann applanation tonometry (GAT) with fluorescein (fGAT), and GAT without fluorescein (nGAT). The study was also performed to test whether the values obtained using each technique change in accordance with the central corneal thickness (CCT) and refractive and keratometric values.Study designThis study was a prospective study of 188 eyes of 94 healthy volunteers. Methods: IOP was measured using fGAT, nGAT and NCT. CCT, refractive values, and keratometric values were measured, and the correlations and differences in the IOP for each tonometer were investigated.ResultsThe mean IOP values obtained with the NCT, nGAT, and fGAT were 17.5±3.7, 12.3±2.7, and 12.5±2 mmHg. The mean CCT was 538.2±34.4 µm, the mean refractive value was 0.9±1.2 D, and the mean keratometric value was 43.5±1.5 D. NCT was positively correlated with fGAT and GAT values and was significantly higher than both the values. There were no differences between fGAT and GAT values. No correlation was observed between the CCT and keratometric and refractive values and the difference between NCT and nGAT or fGAT.ConclusionDifferences in the measurements obtained using nGAT and fGAT were insignificant (P>0.05). Both values were positively correlated with NCT measurements (r =0.354, P<0.05) and were independent of CCT, keratometry, and refraction values. nGAT appears to be suitable for use in routine clinic practice.

The Association of Central Corneal Thickness and Intraocular Pressure Measures by Non-Contact Tonometry and Goldmann Applanation Tonometry among Glaucoma Patients.

“…This is due to the viscoelastic property of the cornea in which stiffness is associated with the degree of application of tension ( 20 – 22 ). Similar studies have reported that NCT is affected more by CCT than GAT ( 23 , 24 ). In another study among a keratoconus population, the same findings were reported ( 25 ).…”

Comparative Study of Intraocular Pressure Measurements with Airpuff, iCare and Goldmann Applanation Tonometers

“…Erdogan et al 18 conducted a study to compare intraocular pressure (IOP) measurements by noncontact tonometer (NCT), Goldmann applanation tonometry with fluorescein (fGAT), and GAT without fluorescein (nGAT). They also assessed the effect of central corneal thickness (CCT) and keratometric values on IOP.…”

Analysis of Goldman Applanation Tonometry with and without Fluorescein among glaucomatous and non-glaucomatous patients Attending Mzuzu Central Hospital in Malawi

“…Glaucoma is a group of disorders related to optic neuropathy characterized by optic nerve damage due to the loss of ganglion cells [4]. The development of glaucoma and the progression of glaucomatous damage is strongly linked to visual loss [5].…”

“…Although uorescein as a dye enhances the visualization of mires, it is not without its challenges in clinical practice. First, the use of the dye has not been standardized such that too much or too little uorescein affects the diameter of the mires leading to under-or over-estimation of IOP respectively [4].…”

“…However, Bamdad and colleagues assessed the difference in GAT measurements with and without uorescein among non-glaucoma patients in Iran and found no statistically signi cant difference [12]. Again, others [4] in Turkey found no signi cant difference between nfGAT with fGAT.…”