Goldmann applanation tonometry versus non-contact tonometry: a comparative study

Chakrabarty, Lipi

doi:10.18203/2320-6012.ijrms20163547

Cited by 8 publications

(6 citation statements)

References 9 publications

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“…For IOP <10 mmHg it varied by 1-2 mmHg and for >24 mmHg the range was in between 2-5 mmHg. The overestimation of IOP in lower range was also noted by Chakrabarty L. 22 The mean CCT of right eye was 528.9± 29.6micron meters and that of left eye was 530.6±29.6micron meters. All the four instruments namely GAT, Perkin's, Icare ic100 and NCT were influenced by CCT but values positively correlated for Icare ic100 (r 2 =0.032) and NCT (r 2 = 0.035).…”

Section: Discussionsupporting

confidence: 53%

“…Most studies showed NCT overestimates IOP in higher range and underestimates at lower range. [21][22][23] In our study, NCT overestimated IOP in either extremes. For IOP <10 mmHg it varied by 1-2 mmHg and for >24 mmHg the range was in between 2-5 mmHg.…”

Section: Discussioncontrasting

confidence: 42%

“…Both in cases of low IOP (<10 mmHg) and high IOP (>24 mmHg) variation between GAT and NCT was noted. Various other studies such as those done by Tonnu et al, 21 Chakrabarty L., 22 Moseley et al, 23 Lawson Kopp et al, 24 also concluded that NCT is a valuable tool for screening but reliability decreases in outside normal range of IOP. Most studies showed NCT overestimates IOP in higher range and underestimates at lower range.…”

Section: Discussionmentioning

confidence: 89%

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Comparison of intra-ocular pressure measurement with four different methods of tonometry

A¹,

M²,

Shalini³

et al. 2021

IJCEO

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The aim of this study was to measure the intraocular pressure (IOP) by Perkins hand held tonometer, non contact tonometer(NCT) and rebound tonometer with the Gold standard GAT and to analyse their correlation with varied CCT. Materials and Methods: Cross-sectional, hospital-based study that included 200 patients from the glaucoma department. After complete eye evaluation, the IOP measurement was performed sequentially in the same order-NCT, RT, Perkin's and GAT. CCT was then measured for all the patients. The intraocular pressure within the eyes was compared by paired "t" test and between the right and left eyes were compared by the independent "t" test. Results: Mean age of the patients was 54.5±13.5 years. The mean IOP of Right and Left eyes measured with GAT were 15.9±6.2 and 16.3±7.0 mm/Hg, that with Perkins were 15.7±6.2 and 16.3±7.0 mm/Hg respectively. Both eyes' mean IOP were 15.4±6.7 and 15.9±7.4 mm/Hg by Icare. The mean IOP measured by NCT were 16.4±6.7 and 16.9±8.0 mm/Hg. The mean CCT of right eye was 528.9± 29.6 and left eye was 530.6±29.6 microns. All the four instruments namely GAT, Perkin's, Icare ic100 and NCT were influenced by CCT. Conclusions: IOP remains the only alterable factor in the management of glaucoma patients. Numerous methods have been devised to measure IOP accurately. The IOP measured with Perkin's, NCT and Icare are comparable but GAT remains the gold standard.

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Section: Discussionsupporting

confidence: 53%

Section: Discussioncontrasting

confidence: 42%

Section: Discussionmentioning

confidence: 89%

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Comparison of intra-ocular pressure measurement with four different methods of tonometry

A¹,

M²,

Shalini³

et al. 2021

IJCEO

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“…Contrary to some studies, good correlation between GAT and NCT in higher IOP ranges was found. 3 In our study we found NCT values were significantly higher than that of GAT and the values were statistically significant. Shih et al had an objective to ascertain whether CCT affected patient management.…”

Section: Discussionsupporting

confidence: 49%

Comparative Study of Intraocular Pressure Measured by Non-Contact and Goldmann Applanation Tonometer and their Correlation with Corneal Thickness in a General Population

Das¹

2019

jmscr

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To compare the intraocular pressure (IOP) measured by Non-Contact tonometer (NCT) and Goldmann Applanation tonometer (GAT) and their correlation with central corneal thickness (CCT) as well as the reliability of each tonometer. Methods: 500 patients (1000 eyes) attending the ophthalmology OPD aged 18 years and above were taken up for the study. Patients with anterior and posterior segment pathologies like corneal ulcer, leukoma, staphyloma, corneal lacerations, ectatic corneal conditions, corneal dystrophies, oedema, perforations, acute angle closure glaucoma, retinal detachments, vitreous haemorrhage and unwilling patients were excluded from the study. IOP was recorded using NCT and GAT after assessing the patient's visual acuity.Following IOP measurement, central corneal thickness (CCT) value of each patient was measured using pachymetry. All the data were collected and tabulated for statistical analysis to obtain results. Results: In the present study there were 256 males (51.2%) and 244 females (48.8%). The mean CCT in males was 0.5350 mm and in females 0.5340 mm respectively. The mean IOP measured by NCT is 16.43 mm hg whereas the mean IOP measured by GAT is 15.43 mm hg. IOP measured by NCT is significantly higher than the IOP measured by GAT (p<0.001). When correlated with CCT all the tonometers show significant correlation with GAT showing the strongest significant correlation. NCT overestimates IOP in normal, thin and thicker corneas when compared to GAT and are statistically significant. Conclusion:From the present study we can conclude that IOP measured by NCT is higher than GAT. NCT values are significantly higher than GAT values in thin and normal corneas whereas it overestimates more in thicker corneas. All the tonometers show significant correlation with CCT with GAT showing the strongest significant correlation in this study. So, it is always advisable to measure the corrected IOP for each and every patient after taking into account the CCT of that particular person.

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“…Contrary to some studies, good correlation between GAT and NCT in higher IOP ranges was found. 6 In our study we found that NCT values are higher compared to GAT values. NCT overestimates IOP more when CCT values are more than 560-micron metre.…”

Section: Discussionsupporting

confidence: 44%

Comparative study of intraocular pressure measured by non-contact, rebound and goldmann applanation tonometer and their correlation with corneal thickness and true IOP in a general population

Das¹,

L²

2020

IJCEO

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To compare the Intraocular Pressure (IOP) measured by Non-contact tonometer (NCT), Rebound tonometer (RBT) and Goldmann Applanation tonometer (GAT) and their correlation with central corneal thickness (CCT) and true IOP. Reliability of each tonometer. Materials and Methods: 500 random patients aged 18 years and above were taken up for the study. Patients with anterior and posterior segment pathologies like corneal ulcer, leukoma, staphyloma, corneal lacerations, ectatic corneal conditions, corneal dystrophies, oedema, perforations, acute angle closure glaucoma, retinal detachments, vitreous haemorrhage and unwilling patients were excluded from the study. IOP was recorded using NCT, RBT and GAT after assessing the patient's visual acuity. Following IOP measurement, central corneal thickness (CCT) of each patient was measured using pachymetry. All the data were collected and tabulated for statistical analysis to obtain results. Results: The mean CCT in males was 0.5350 mm and in females 0.5340 mm respectively. The mean IOP measured by NCT is 16.43 mm hg whereas the mean IOP measured by GAT is 15.43 mm hg. IOP measured by NCT is significantly higher than the IOP measured by GAT (p<0.001). When NCT and RBT are compared NCT values are significantly higher than that of RBT(p<0.001). Although the mean RBT IOP 15.83 mm hg is higher than the mean GAT IOP of 15.42 mm hg the values are not statistically significant. When correlated with CCT all the tonometers showed significant correlation with GAT showing the strongest correlation. NCT overestimates IOP in normal, thin and thicker corneas when compared to GAT and are statistically significant. RBT also overestimates in the normal and thick corneas when compared to GAT but their values are much closer to GAT values in thinner corneas. The IOP measured by all the 3 tonometers correlated with corrected IOP with NCT showing the best correlation followed by GAT. Conclusion:From the present study we can conclude that IOP measured by NCT and RBT is higher than GAT. NCT values are significantly higher than GAT values in thin and normal corneas whereas it overestimates more in thicker corneas. RBT values are significantly higher than that of GAT in normal and thick corneas. So, it is always advisable to measure the corrected IOP for each patient after considering the CCT.

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Goldmann applanation tonometry versus non-contact tonometry: a comparative study

Cited by 8 publications

References 9 publications

Comparison of intra-ocular pressure measurement with four different methods of tonometry

Comparison of intra-ocular pressure measurement with four different methods of tonometry

Comparative Study of Intraocular Pressure Measured by Non-Contact and Goldmann Applanation Tonometer and their Correlation with Corneal Thickness in a General Population

Comparative study of intraocular pressure measured by non-contact, rebound and goldmann applanation tonometer and their correlation with corneal thickness and true IOP in a general population

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