Comparison of intraocular pressure using Goldmann applanation tonometry versus non-contact tonometry in eyes with high-viscosity silicone oil

2019 ◽  
Vol 30 (3) ◽  
pp. 494-499 ◽  
Author(s):  
Dionysios D Pagoulatos ◽  
Zoi G Kapsala ◽  
Olga E Makri ◽  
Ilias G Georgalas ◽  
Constantinos D Georgakopoulos
Keyword(s):  
Intraocular Pressure ◽  
Silicone Oil ◽  
Corneal Thickness ◽  
Measurement Techniques ◽  
High Viscosity ◽  
Applanation Tonometry ◽  
Applanation Tonometer ◽  
Iop Measurement ◽  
Prospective Comparative Study ◽  
Silicone Oil Tamponade

Background: To compare intraocular pressure (IOP) measurements using Goldmann applanation tonometer (GAT) and air tonometer (non-contact tonometry [NT]) in vitrectomized eyes with high-viscosity silicone oil tamponade, as well as in normal eyes. Patients and Methods: In this prospective comparative study, 32 eyes with silicone oil tamponade of high viscosity (5700 CS) and 32 normal fellow eyes were included. IOP was measured by GAT and air tonometer 30 ± 12 days after vitrectomy, while measurements of central corneal thickness (CCT) were also obtained. Results: In eyes with silicone oil, IOP was 20.09 ± 4.91 mmHg and 16.75 ± 3.86 mmHg using contact tonometer and air tonometer, respectively ( p < 0.0001). In normal eyes, IOP was 16.41 ± 2.15 mmHg and 16.31 ± 2.49 mmHg using the same tonometry techniques and this difference was not statistically significant ( p = 0.598). In addition, no significant correlation was detected between IOP measurements using both techniques and age, gender, CCT, and type of lens. Conclusions: It seems that GAT overestimates IOP in eyes with high-viscosity silicone oil compared with NT, while both IOP measurement techniques in normal eyes provide similar values. Further assessment of available IOP measurement methods could possibly establish the most accurate technique for IOP estimation in vitrectomized eyes with silicone oil tamponade.

scholarly journals Intraocular Pressure Measurement Using Ocular Response Analyzer, Dynamic Contour Tonometer, and Scheimpflug Analyzer Corvis ST

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
Lisa Ramm ◽  
Robert Herber ◽  
Eberhard Spoerl ◽  
Frederik Raiskup ◽  
Lutz E. Pillunat ◽  
...  
Keyword(s):  
Intraocular Pressure ◽  
Healthy Subjects ◽  
Corneal Thickness ◽  
Applanation Tonometry ◽  
Ocular Response Analyzer ◽  
Corvis St ◽  
Dynamic Contour Tonometer ◽  
Iop Measurement ◽  
Good Agreement

Purpose. To compare intraocular pressure (IOP) measurements with Goldmann applanation tonometry (GAT), ocular response analyzer (ORA), dynamic contour tonometer (DCT), and Corvis ST (CST) in healthy subjects. Methods. In a prospective, observational study, IOP measurements with GAT (GAT-IOPc), ORA (IOPcc), DCT (DCT-IOP), and CST (bIOP) were performed and analyzed in 94 healthy subjects. Results. Mean age of the participants was 45.6 ± 17.2 years (range 18 to 81 years). Mean GAT-IOPc was 12.9 ± 2.4 mmHg, mean DCT-IOP was 16.1 ± 2.6 mmHg, and mean IOPcc was 15.6 ± 3.3 mmHg. DCT-IOP and IOPcc were significantly higher than GAT-IOPc (P<0.001). Mean bIOP was 13.5 ± 2.4 mmHg that was slightly higher but not significantly different from GAT-IOPc (P=0.146). Correlation analysis of IOP values and central corneal thickness (CCT) revealed a negative correlation between GAT-IOPc and CCT (r = −0.347; P=0.001). However, IOPcc, DCT-IOP, and bIOP showed no significant correlation to CCT. Only bIOP revealed a weak but significant age dependency (r = 0.321, P=0.002). Conclusion. All tonometry devices showed a good agreement of biomechanical corrected IOP values with GAT-IOPc. As no influence of CCT on IOPcc, DCT-IOP, and bIOP was detectable, the used correction algorithms appear to be appropriate in these tonometers in the clinical setting. The highest agreement was found between GAT-IOPc and bIOP. However, bIOP weakly correlated with participants’ age. Further studies are needed to elucidate the role of bIOP for IOP measurement.

scholarly journals Effect of Hemifacial Spasm on Intraocular Pressure Measurement

2018 ◽  
Vol 2018 ◽  
pp. 1-4
Author(s):  
Erdogan Cicik ◽  
Rengin Yildirim ◽  
Ceyhun Arici ◽  
Funda Dikkaya ◽  
Osman Sevki Arslan
Keyword(s):  
Intraocular Pressure ◽  
Healthy Volunteers ◽  
Hemifacial Spasm ◽  
Clinical Decision Making ◽  
Corneal Thickness ◽  
Clinical Decision ◽  
Age And Gender ◽  
Applanation Tonometer ◽  
Iop Measurement ◽  
And Gender

Purpose. To evaluate the effect of hemifacial spasm (HFS) on intraocular pressure (IOP) measurement. Methods. Twenty-four consecutive patients with HFS and 25 age- and gender-matched randomly selected eyes of healthy volunteers underwent corneal pachymetry and IOP measurements using Goldmann applanation tonometer (GAT) and noncontact tonometer (NCT). IOP measurements were performed before (during HFS) and 2 weeks after Botox injections in HFS patients and in healthy volunteers without Botox injections. Results. There was no statistical difference between involved eye side and uninvolved eye side of HFS patients in measured central corneal thickness. Similarly, no difference was found between involved eye side of HFS patients and controls. There were no statistically significant differences comparing IOP values before treatment and levels measured at 2 weeks of Botox injections, either with GAT (p=0.33, 0.11) or NCT (p=0.80, 0.43) devices in the involved eyes and uninvolved eyes of patients with HFS, respectively. There were also no significant differences in these parameters (GAT (p=0.63) and NCT (p=0.54)) in controls. Conclusions. Contractions in facial muscles may not lead to significant increase in IOP in HFS patients. This result may help clinical decision making in the treatment of glaucoma patients with HFS. This trial is registered with NCT03390803.

Comparison of Intraocular Pressure Measurement between Non-Contact and Goldmann Applanation Tonometry among Glaucoma Patients in Ratchaburi Hospital

2020 ◽  
Vol 103 (8) ◽  
pp. 819-823
Keyword(s):  
Intraocular Pressure ◽  
Outpatient Clinic ◽  
Pressure Measurement ◽  
Applanation Tonometry ◽  
Goldmann Applanation Tonometry ◽  
Mean Difference ◽  
Goldmann Applanation Tonometer ◽  
Applanation Tonometer ◽  
Iop Measurement ◽  
The Mean

Objective: To compare the intraocular pressure (IOP) values acquired from the non-contact tonometers and a Goldmann applanation tonometer in glaucoma patients. Materials and Methods: The present study included 300 eyes from 150 participants that attended the glaucoma outpatient clinic. The IOP was measured using both non-contact tonometry (NCT) and Goldmann applanation tonometry (GAT). The differences in IOP readings between the two techniques were evaluated. Results: The mean IOP as measured by NCT was 16.26±6.95 mmHg, when that of measured by GAT was 16.11±8.43 mmHg. The mean difference between the two techniques of measurement was 0.147±3.01 mmHg. The values acquired from NCT were slightly higher than those acquired by GAT in 49% of patients, and this difference was more distinct when the IOP as measured by GAT more than 21 mmHg. Conclusion: There was no statistically significant correlation in the measurement of IOP between non-contact and GAT tonometers. NCT is a proper method for mass screenings of IOP even if the IOP measurement by NCT is slightly higher than by GAT. Keywords: Tonometry, Comparison, Glaucoma, Non-contact tonometry, Goldmann applanation tonometerv

Ocular Response Analyzer versus Goldmann Applanation Tonometer for Measurement of Intra-Ocular Pressure

QJM ◽  
2021 ◽  
Vol 114 (Supplement_1) ◽  
Author(s):  
Rim Raafat Fayez ◽  
Mohamed Adel Abdelshafik ◽  
Ahmed Ibrahim Aboulenain ◽  
Momen Mahmoud Hamdi
Keyword(s):  
Corneal Thickness ◽  
Cross Sectional Study ◽  
Applanation Tonometry ◽  
Ocular Response Analyzer ◽  
Cross Sectional ◽  
Goldmann Applanation Tonometer ◽  
Applanation Tonometer ◽  
Iop Measurement ◽  
The Mean ◽  
Method Of Evaluation

Abstract Background Goldmann applanation tonometry (GAT) has been the gold standard for intraocular pressure(IOP) measurement ,since its appearance in clinical practice around 50 years ago.(1) In spite of being almost unchallenged, the last few years have become a sustained search for a new standard method for IOP measurement,. One such recently marketed instrument is the Ocular Response Analyzer (ORA), which able to detect the corneal biomechanics. Aim of the Work is to compare the IOP measurement estimated by Goldmann applanation tonometer to that of ORA and detect the effect of state of refraction, corneal topography and central corneal thickness (CCT) on these measurements. Patients and Methods This cross-sectional study was done from March 2018 to October 2018 on 65 eyes of patients visiting the outpatient clinic. Results The mean GAT IOP was 15.938 ± 6.041 while the mean ORA (IOPcc) and (IOPg) were 19.711 ± 7.59 and 17.242 ± 7.35 mm Hg respectively. There is a strong positive relationship between GAT IOP & ORA IOPg measurement (r = 0.880 – p = &lt;0.001*). Also finding a weak yet significant correlation between IOPg and CCT (r = 0.385, p = 0.001). None of the pressure measurements was affected by refraction or corneal curvature significantly. Conclusion In conclusion, our results suggest that mean IOPs obtained by ORA were significantly higher than that of GAT with different influencing factors that are not completely understood. caution has to be sought when using the ORA, the values obtained ought not to be used interchangeably with the values obtained by 1 GAT, despite the presence of a positive correlation between these values. This underlines the importance of using one and only method of evaluation of the IOP for every patient in successive follow-up visits.

Intraocular Pressure Measurement

Glaucoma ◽  
2012 ◽  
Author(s):  
Manishi Desai
Keyword(s):  
Intraocular Pressure ◽  
Corneal Thickness ◽  
Applanation Tonometry ◽  
Slit Lamp ◽  
Topical Anesthetic ◽  
Fick Principle ◽  
Average Patient ◽  
Risk Of Progression ◽  
Iop Measurement ◽  
To Come

Intraocular pressure (IOP) measurement is a key test by which patients with glaucoma are clinically monitored. Clinical trials have demonstrated that a reduction in IOP results in a reduction in the risk of progression of glaucoma. Accordingly, measuring IOP with relative accuracy is very important in managing patients. There are multiple methods to measure IOP. The method used may depend on the particular clinical setting. All are surrogate measures in comparison to manometry (i.e., IOP measurement using an intracameral cannula), which is the most direct means to measure IOP. However, manometry is not practical for everyday clinical practice since it is invasive. This overview provides information about currently available methods to measure IOP and how they may be best applied. This section also outlines the advantages and disadvantages involved with these methods. Not all techniques are available to every practitioner, but knowing the principles behind these methods and the limitations should allow clinicians to more carefully interpret and reliably obtain IOP measurements using the techniques at their disposal. Goldmann applanation tonometry (GAT) is considered to be the standard by which IOP is measured for the average patient (i.e., average corneal thickness without apparent corneal abnormalities). GAT is also likely the measurement modality most readily available to practitioners. The Perkins tonometer is a handheld Goldmann applanation device (Fig. 1.1B). This is helpful when measuring IOP in children as it can be used in the upright or supine position and for patients unable to come to the slit lamp. Based on the Imbert-Fick principle Applanation diameter is 3.06 mm (not the size of the applanation tip, which is larger), so that 1 g of force represents 10 mmHg. Assumes the eye is a sphere, corneal thickness is estimated to be 0.52 mm, and volume displaced by contact is negligible Instill topical anesthetic and fluorescein dye. Clean tip (see recommended cleaning technique at end of this section). Position patient at slit lamp (for GAT). Set illumination to cobalt blue filter and set force knob/drum to 1 (which corresponds to 10 mmHg).

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

2020 ◽  
Vol 30 (6) ◽  
Author(s):  
Samuel Kyei ◽  
Frank Assiamah ◽  
Michael Agyemang Kwarteng ◽  
Cynthia Pakyennu Gboglu
Keyword(s):  
Intraocular Pressure ◽  
Significant Relationship ◽  
Pressure Measurement ◽  
Central Corneal Thickness ◽  
Corneal Thickness ◽  
Applanation Tonometry ◽  
Goldmann Applanation Tonometry ◽  
Goldmann Applanation Tonometer ◽  
Applanation Tonometer ◽  
The Right

BACKGROUND፡ The aim of this study was to determine whether Central Corneal Thickness (CCT) is associated with intraocular pressure measurement (IOP) with a Non-contact tonometer and the Goldmann applanation tonometer in glaucoma patients.MATERIALS AND METHODS: The study involved two hundred and thirty-two eyes of clinically diagnosed glaucoma patients receiving care at a referral facility. IOP measurements were obtained using both the Non-Contact Tonometer (NCT) and Goldmann Applanation Tonometer (GAT). The association between age, ethnicity, and CCT, as well as CCT on the measures of NCT and GAT, were analyzed.RESULTS: There were 64(55.2%) males and 52 (44.8%) females and their ages ranged from 18 to 85 years (mean age = 47.72; SD ±15.75 years). There was a weak positive correlation between the CCT and NCT findings in the right eye (r = 0.19, n = 116, p < 0.05) and in the left eye (r = 0.25, n = 116, p < 0.05). However, there was no correlation between CCT and GAT measurements. Age had a significant correlation with CCT while gender and ethnicity had no significant correlation.CONCLUSION: The study found a significant association between CCT and NCT. However, there was no significant association between CCT and GAT. CCT had an association with age but independent of gender and ethnicity since there was no significant relationship between these variables.

scholarly journals Comparability of three intraocular pressure measurement: iCare pro rebound, non-contact and Goldmann applanation tonometry in different IOP group

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Min Chen ◽  
Lina Zhang ◽  
Jia Xu ◽  
Xinyi Chen ◽  
Yuxiang Gu ◽  
...  
Keyword(s):  
Intraocular Pressure ◽  
Pearson Correlation ◽  
Linear Regression Analysis ◽  
Corneal Thickness ◽  
Intraclass Correlation ◽  
Cross Sectional Study ◽  
Applanation Tonometry ◽  
Cross Sectional ◽  
Wide Range ◽  
Iop Measurement

Abstract Background Measurement of intraocular pressure (IOP) is essential for glaucoma patients. Many factors such as central corneal thickness (CCT) can affect the accuracy of IOP measurement. The purpose of this study was to evaluate the agreement of IOP measured by non-contact tonometer (NCT), iCare pro rebound tonometer (iCare), and Goldmann applanation tonometer (GAT) in different IOP group. Methods This was a Hospital-based cross-sectional study. Two hundred subjects were enrolled in this study. All subjects underwent IOP measurement using an NCT–iCare–GAT sequence. Bland-Altman, Pearson correlation and intraclass correlation analysis were performed using SPSS 17.0 software. The influence of CCT on each IOP measurement methods was evaluated by linear regression analysis. Results The mean difference (Δ) of NCT–GAT did not differ from (Δ) iCare–GAT in IOP < 10 and 10–21 mmHg group. However, (Δ) NCT–GAT was significantly higher than (Δ) iCare–GAT in IOP 22–30 and > 30 mmHg group (P < 0.05). Bland–Altman analysis showed significant agreement between the three devices (P < 0.01). IOP measurements of the three methods were significantly correlated with CCT (P < 0.01). Conclusions ICare pro shows a higher agreement with GAT over a wide range of IOP compared with NCT. The consistency between the three tonometers was similar in a low and normal IOP range. However, NCT shows a greater overestimate of IOP in moderate and higher IOP group. The variability of IOP measurement affected by CCT is NCT > iCare pro > GAT.

scholarly journals Evaluation of Intraocular Pressure (IOP) Regarding Circadian Rhythm, Age, Sex and Eye Side in Awassi Sheep

2018 ◽  
Vol 69 (2) ◽  
pp. 959 ◽  
Author(s):  
K. KULUALP ◽  
S. KILIҪ ◽  
S. ÇAKIR ◽  
C. ORHAN
Keyword(s):  
Circadian Rhythm ◽  
Intraocular Pressure ◽  
Ganglion Cells ◽  
Applanation Tonometry ◽  
Nerve Degeneration ◽  
Awassi Sheep ◽  
Healthy Sheep ◽  
Applanation Tonometer ◽  
Iop Measurement ◽  
Eye Examination

Measurement of intraocular pressure (IOP) in domestic animals has become a part of routine eye examination with advent of applanation tonometer. Delayed control of high IOP may lead to permanent blindness due to retinal ganglion cells dysfunction and optic nerve degeneration. This study aimed at evaluating IOP of Awassi sheep with respect to circadian rhythm, age, sex and eye sides and finally to establish a reference (baseline, normal) IOP value for this particular species. A total of 24 healthy sheep with different ages and sexes were used. The animals were divided into 2 equal groups, <1 (6 male, 6 female, n = 12) and ≥1 (6 male, 6 female, n = 12) years old. IOP measurements were performed twice, in the morning (6:00 a.m.) and in the evening (8:00 p.m.) with Tono-pen Vet® applanation tonometer. Mean IOP in the animals decreased from 16.21 mmHg in the morning to 12.65 mmHg in the evening with an approximately rate of 22% (P <0.0001). Comparison of mean IOP values of right eyes (n=12) to the left (n=12), male (n=48) to female (n=48), and ages < 1 (n=48) to ≥ 1 (n=48) showed no difference (P >0.05). The reference IOP for this animal was calculated as 14.43±2.72 mmHg notwithstanding any variable. It was concluded that in this breed IOP values can vary significantly as far as circadian rhythm is concerned and Tono-pen Vet® can be used for sheep IOP measurement as an alternative to other applanation tonometry.

Dynamic Contour Tonometry and Goldmann Applanation Tonometry: Correlation with Intracameral Assessment of Intraocular Pressure

2011 ◽  
Vol 22 (1) ◽  
pp. 55-62 ◽  
Author(s):  
Ivano Riva ◽  
Luciano Quaranta ◽  
Andrea Russo ◽  
Andreas Katsanos ◽  
Eliana Rulli ◽  
...  
Keyword(s):  
Intraocular Pressure ◽  
Anterior Chamber ◽  
Open Angle Glaucoma ◽  
Corneal Thickness ◽  
Applanation Tonometry ◽  
Dynamic Contour Tonometry ◽  
Altman Plot ◽  
Applanation Tonometer ◽  
The Relationship

Purpose To compare intraocular pressure (IOP) measured using a dynamic contour tonometer (DCT) and a Goldmann applanation tonometer (GAT) with in vivo intracameral IOP, and establish the relationship between DCT, GAT and central corneal thickness (CCT) in patients with primary open-angle glaucoma (POAG). Materials and Methods We examined 50 eyes of 50 patients with POAG scheduled for glaucoma or cataract surgery. Immediately before surgery, CCT, GAT and DCT IOP were assessed, after which manometry of the anterior chamber was performed. A Bland-Altman plot was used to test the agreement among the 3 measurements of IOP, and univariate and multivariate regression analyses were used to evaluate the effect of CCT on DCT and GAT. Results On average, the DCT readings were 4.0±1.6 mmHg higher than the GAT readings and 2.3±2.4 mmHg higher than the manometric readings; the GAT measurements were generally a mean 1.7±1.8 mmHg lower than the manometric readings. The CCT had an almost similar influence on DCT and GAT measurements (p=0.84). Conclusions The DCT-measured IOP was significantly higher than that measured by means of GAT and anterior chamber manometry. The DCT and GAT readings were both influenced by CCT to the same extent.

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