Comparison of IOP Measurement by Goldmann Applanation Tonometer, ICare Rebound Tonometer, and Tono-Pen in Keratoconus Patients after MyoRing Implantation

Rateb, Mahmoud; Abdel-Radi, Mahmoud; Eldaly, Zeiad H; Elmohamady, Mohamed Nagy; Din, Asaad Noor El

doi:10.1155/2019/1964107

Cited by 5 publications

(7 citation statements)

References 30 publications

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“…This study was in perfect agreement with our study. 13 Rateb M et al 14 in their study concluded that there was no significant correlation between the IOP measurements done using different tonometers, this was contrary to our present study finding, which showed a significant positive correlation between the measurements…”

Section: Discussioncontrasting

confidence: 99%

Four Tonometers and their correlation- A comparative study

E¹

2019

jmscr

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Background: Early identification of Ocular Hypertension is needed to prevent and control the life threatening glaucoma. Objectives 1. To compare the Intra ocular pressure assessed by using GAT, Schiotz, Tonopen and Non Contact Tonometer (NCT) 2. To correlate the Schiotz, Tonopen and NCT tonometers with GAT in measuring the IOP Materials and Methods: Cross-sectional study conducted in Ophthalmology department of SSSIHMS, Andhra Pradesh for a period of 2 months.112 study participants were included in the study and their IOP was assessed using GAT, Schiotz, Tonopen and NCT tonometers and the readings were compared. Statistical analysis was done using Pearson correlation and p value Results: The mean age of the participants was 53.20 ± 13.03 years. Most of them are males 66(58.9%), illiterates 50(44.7%) and they belonged to Class I socio-economic status 49(43.7%). The average intra ocular pressure was high in females than males. There was a difference in average IOP between Right eye and Left eye measured using the 4 different tonomters. The mean IOP in left eye was high compared to Right eye, measured using NCT, Tonopen and Schiotz. However the GAT measurement in contrary showed high IOP in Right eye comparing the left eye Pearson correlation showed a moderate positive correlation between the 4 tonometric assessments, having r value of 0.577 and it was statistically significant. Conclusion:Positive correlation between the tonometric readings gives the future consideration in using various tonometers for IOP measurements.

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Section: Discussioncontrasting

confidence: 99%

Four Tonometers and their correlation- A comparative study

E¹

2019

jmscr

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“…Our study showed a positive correlation between IOP readings taken by both air puff and GAT tonometers, and CCT, but both were statistically insignificant (p-value 0.190, 0.058 respectively). These results were consistent with those of Rateb et al's 16 study, where there was no significant correlation between CCT and any of the IOP measurements taken by GAT, Icare rebound tonometer, and Tono-Pen in KCN patients after MyoRing implantation.…”

Section: Discussionsupporting

confidence: 92%

“…However, it did not find a significant difference between GAT/Tono-Pen readings, where the p-value was 0.554, while Bland-Altman analysis showed a reasonable agreement between each pair of the tonometers. 16 In our study, there was a significant difference between the three tonometers readings (p-value <0.001) using ANOVA measure. By using the correlation coefficient, no agreement was found between any pair of them.…”

Section: Discussionmentioning

confidence: 46%

“…Accurate measurement of the IOP is crucial and at the same time challenging for many ophthalmologists, especially when the ocular surface has been modified in some way as in some corneal diseases for example, KCN or after corneal refractive surgeries. 16 GAT is usually considered the gold standard tonometry for IOP measurement by many ophthalmologists. 6 However, changes in corneal geometry caused by the presence of intrastromal corneal ring segments affect the capability of GAT to measure IOP accuretaley.…”

Section: Discussionmentioning

confidence: 99%

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Comparison between different tonometers following intrastromal corneal ring segments implantation

Elfwwal

Elbasty

Khattab

et al. 2021

European Journal of Ophthalmology

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Purpose: To compare different intraocular pressure (IOP) readings in corneas with intrastromal corneal ring segments (ICRS) taken by three different tonometers; Goldmann applanation tonometry (GAT), air puff tonometer, and ocular response analyzer (ORA) corneal-compensated IOP (ORA-IOPcc) and determine the relation of these measurements to different corneal parameters taken by Pentacam. Methods: An observational cross-sectional analytic study included patients who underwent ICRS keraring implantation at 3 months. In each eye, the two rings were placed using the femtosecond laser assisted technique 5.5 or 6 mm from the center. IOP was measured using three different tonometers; GAT, air puff tonometer, and ocular response analyzer (ORA) corneal-compensated IOP (ORA-IOPcc). Results: Fifty eyes of 30 patients (20 males and 10 females) aged 27.56 ± 6.38 years were included. IOP measurements by GAT, air puff tonometer, and ORA-IOPcc were 13.28 ± 2.13 mmHg, 10.47 ± 2.55 mmHg, and 13.19 ± 2.78 mmHg, respectively. Comparisons between air puff and each of GAT and ORA-IOPcc were statistically highly significant ( p-value <0.001). Conclusion: IOP measurements taken by air puff tonometer were significantly lower than those taken by GAT and ORA-IOPcc. These differences were not constant across the pressure range but increased as the pressure values determined using GAT and ORA increased. ORA-IOPcc and GAT showed similar readings. No correlation was found between any of the IOP readings taken by the three tonometers and the central corneal thickness.

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“…31 KC is most common in adolescents and young adults and occurs in both boys/men and girls/women. 11 In the present study, we selected SP-A1 as a biomechanical factor to analyze its correlations with DIOP1 and DIOP2 and adjusted the age and CCT. The differences between DIOP1 and DIOP2 were correlated with SP-A1 in all 3 groups after adjustment for CCT and age.…”

Section: Discussionmentioning

confidence: 99%

Agreement of Corrected Intraocular Pressure Values Between Corvis ST and Pentacam in Patients With Keratoconus, Subclinical Keratoconus, and Normal Cornea

Chen

Hua²,

Liu³

et al. 2021

Cornea

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To analyze the agreement of corrected intraocular pressure (IOP) values between Corvis ST (DIOP1) and Pentacam (DIOP2) in patients with keratoconus (KC), subclinical KC (sub-KC), and normal cornea. Methods:In total, 235 eyes were divided into KC, sub-KC, and control groups. Differences in DIOP1 (biomechanically corrected IOP minus uncorrected IOP) and DIOP2 (central corneal thickness-corrected amounts of IOP) were analyzed within and among groups. Topographical and biomechanical differences were compared among the 3 groups. Factors affecting differences between DIOP1 and DIOP2 were analyzed. Agreement analysis of DIOP2 and DIOP1 was performed by Bland-Altman plots for all 3 groups.Results: Mean DIOP1 was highest in the KC group (1.23 6 0.84 mm Hg), followed by sub-KC and control groups (all P , 0.05). Deformation amplitude ratio at 2 mm (DA-2 mm), integrated radius, stiffness parameter at first applanation, and Corvis biomechanical index values significantly differed between sub-KC and control groups. The differences between DIOP1 and DIOP2 were affected by stiffness parameter at first applanation, after adjusting for central corneal thickness and age, in all 3 groups. The lowest agreement between DIOP2 and DIOP1 was observed in the KC group (mean difference: 1.90 mm Hg; 95% limit of agreement ranged from 20.2 to 3.9 mm Hg).Conclusions: Among the 3 groups in this study, the KC group exhibited the worst consistency between DIOP2 and DIOP1. For the sub-KC and control groups, corrected IOP values derived by Pentacam were similar to Corvis ST. Ophthalmologists should carefully consider the mechanical properties of eyes with KC during IOP management.

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Comparison of IOP Measurement by Goldmann Applanation Tonometer, ICare Rebound Tonometer, and Tono-Pen in Keratoconus Patients after MyoRing Implantation

Cited by 5 publications

References 30 publications

Four Tonometers and their correlation- A comparative study

Four Tonometers and their correlation- A comparative study

Comparison between different tonometers following intrastromal corneal ring segments implantation

Agreement of Corrected Intraocular Pressure Values Between Corvis ST and Pentacam in Patients With Keratoconus, Subclinical Keratoconus, and Normal Cornea

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