The influence of corneal density and thickness on tonometry measurement with goldmann applanation, non-contact and iCare tonometry methods

Lubbad, Ahmed; Oluwatoba-Popoola, Irene; Haar, M. van der; Framme, Carsten; Bajor, Anna

doi:10.1007/s10792-022-02216-6

Cited by 3 publications

(3 citation statements)

References 23 publications

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“…15 The Goldmann Applanation tonometer (GAT) is less vulnerable to CCT than the NCT. [15][16][17][18][19] NCT causes the cornea to flatten in a brief amount of time-roughly 8 ms-making the cornea more rigid than GAT, which measures the response of cornea to steady pressure or compression. Increased measured IOP with increased CCT are consistent across clinical and demographic research alike.…”

Section: Discussionmentioning

confidence: 99%

Correlation between Central Corneal Thickness and Intraocular Pressure: A Cross Sectional Study

Alberta¹,

Ernawati²,

Rofiq³

2023

pak J Ophthalmol

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Purpose: To find out correlation between Central Corneal Thickness (CCT) and Intra Ocular Pressure (IOP). Study Design: Observational Correlational study. Place and Duration of Study: This study was conducted in Ophthalmology Clinic Primasatya Husada Citra Hospital Surabaya from September 2021 to October 2021. Methods: One hundred and fifteen subjects were selected through consecutive sampling. Patients of 20-60 years age and visiting ophthalmology clinic were included. Patients with history of glaucoma, hypertension, body mass index (BMI) above 30 kg/m2, under steroid treatment (topical, systemic, peri ocular, inhalation), undergone eye surgery including corneal and refractive surgery, smoker (> 100 cigarettes in his/her life and is still smoking), Alcoholic (> 1 time/month), chronic kidney disease (CKD) and myopia (> 6 diopters) were excluded. Association between CCT and IOP was calculated using Pearson's correlation coefficient. Results: A total 115 patients were included, 69 (60%) females and 46 (40.0%) males. Mean age was 35.78 ± 11.64 years old. Mean CCT was 550.26 ± 31.66 µm and 551.43 ± 34.92 µm for right and left eye respectively. IOP was 16.06 ± 3.71 mmHg and 15.76 ± 3.52 mmHg in right and left eyes respectively. There was a moderate positive relationship of CCT and IOP. There was a good relationship between right and left “IOP (R = 0.830, p = 0.000) and CCT (R = 0.856, p = 0.000).” Conclusion: CCT had a moderate positive correlation with IOP (right eyes: R = 0.355, p = 0.000; left eyes: R = 0.381, P = 0.000). There is a positive relationship between CCT and IOP in both eyes (p = 0.000).

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Section: Discussionmentioning

confidence: 99%

Correlation between Central Corneal Thickness and Intraocular Pressure: A Cross Sectional Study

Alberta¹,

Ernawati²,

Rofiq³

2023

pak J Ophthalmol

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“…Measuring CCT is an important parameter in determining IOP by GAT. 12,14 An elevated IOP after PPV can be due to numerous causes including change in CCT. 15 A quickly triggered, inflammatory (TNF-α mediated), IOP-independent process occurring due to acute injury or surgical procedure is also identified.…”

Section: Discussionmentioning

confidence: 99%

“…9,10 This can cause errors in readings of IOP and may lead to false diagnosis of secondaryglaucoma. 11,12 Doughty and Zaman reported that a 10% change in CCT may cause 3.4mmHg change in IOP. 13 This research was designed to assess the outcome of PPV in terms of CCT and its influence on IOP.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pars Plana Vitrectomy on Central Corneal Thickness and Its Influence onIntraocular Pressure

Zia,

Kazi,

Ghazipura

et al. 2023

pak J Ophthalmol

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Purpose: To determine the effect of Pars Plana Vitrectomy on the central corneal thickness(CCT)and its influence on intraocular pressure(IOP). Study Design: Interventional case series. Place and Duration of Study: This research was conducted at Ibrahim Eye Hospital, Karachi, Pakistan, from October 2022 to March 2023. Methods: Forty-one patients of either sexpresenting with posterior segment disease and planned for Pars Plana vitrectomy (PPV) were selected after written informed consent. Pre and post-operative comparison of CCT and IOP was done using paired t-test. Follow-up of readings was done by repeated measures ANOVA test. BCVA measurements were based on the Snellen chart and were converted to the logarithm of the minimum angle of resolution (logMAR) scale for statistical analysis. Results: CCT and IOP of the affected eyes were increased considerably in the first post-operative week (CCT=591 ± 1.5,IOP=28 ± 1.5)and decreased significantly in the 3rd month(CCT=527 ± 1.34, IOP=13 ± 2.5). The change was insignificant at 6thmonth follow-up. BCVA was improved in first week (626 ± 1.34) and remained same throughout the follow-up period. Maximum change in CCT (ΔCCT)was found in age <15 years and in aphakic eyes (119 ± 0.09). Conclusion: Pars Plana vitrectomy causes significant change in CCTwhich can influenceIOP. This change should be kept in mind to prevent false diagnosis of glaucoma in the early post-operative period of PPV. Young patients and Aphakic eyes are more prone to the corneal changes.

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Impacts and Correlations on Corneal Biomechanics, Corneal Optical Density and Intraocular Pressure after Cataract Surgery

Lin,

Ho,

et al. 2024

Diagnostics

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The study aimed to investigate the extended effects and interrelations of corneal biomechanics, corneal optical density (COD), corneal thickness (CT), and intraocular pressure (IOP) following cataract surgery. Sixteen eyes were analyzed prospectively. The Corneal Visualization Scheimpflug Technology (Corvis ST) device assessed corneal biomechanics, while the Pentacam AxL® (Pentacam) measured COD and CT. Postoperative data were collected around six months after surgery, with a subgroup analysis of data at nine months. The Pearson correlation was used to examine the relationship between surgical-induced changes in corneal biomechanics and COD. At six months, significant postoperative differences were observed in various biomechanical indices, including uncorrected IOP (IOPuct) and biomechanics-corrected IOP (bIOP). However, many indices lost statistical significance by the nine-month mark, suggesting the reversibility of postoperative corneal changes. Postoperative COD increased at the anterior layer of the 2−6 mm annulus and incision site. The changes in COD correlated with certain biomechanical indices, including maximal (Max) deformative amplitude (DA) and stiffness parameter (SP). In conclusion, despite significant immediate postoperative changes, corneal biomechanics, COD, and IOP experienced a gradual recovery process following cataract surgery. Clinicians should maintain vigilance for any unusual changes during the short-term observation period to detect abnormalities early.

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The influence of corneal density and thickness on tonometry measurement with goldmann applanation, non-contact and iCare tonometry methods

Cited by 3 publications

References 23 publications

Correlation between Central Corneal Thickness and Intraocular Pressure: A Cross Sectional Study

Correlation between Central Corneal Thickness and Intraocular Pressure: A Cross Sectional Study

Effect of Pars Plana Vitrectomy on Central Corneal Thickness and Its Influence onIntraocular Pressure

Impacts and Correlations on Corneal Biomechanics, Corneal Optical Density and Intraocular Pressure after Cataract Surgery

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