The Influence of the Cornea on Intraocular Pressure Measurement by ICARE PRO and ORA

Pluháček, František; Unzeitigová, Andrea; Marešová, K; Rybář, Jan

doi:10.31348/2019/3/1

Cited by 4 publications

(3 citation statements)

References 35 publications

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“…The authors concluded that the major factor that influences the IOP is CCT ( Uva et al, 2011 ). Another study reported that the IOP measured using Icare was positively correlated with CCT ( Pluháček et al, 2019 ). In the present study, we did not measure CCT in infants.…”

Section: Discussionmentioning

confidence: 99%

Intraocular pressure effect of intravitreal conbercept injection for retinopathy of prematurity

Gao

Zhao

et al. 2023

Front. Pharmacol.

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Purpose: Intravitreal injection of conbercept (IVC) is a novel anti-vascular endothelial growth factor (anti-VEGF) treatment for retinopathy of prematurity (ROP). This study aimed to assess the intraocular pressure (IOP) effect of IVC.Methods: All IVC surgeries were performed in the Department of Ophthalmology, Guangdong Women and Children Hospital, from January 2021 to May 2021. In this study, 30 eyes of 15 infants who received intravitreal injections of conbercept at a dose of 0.25 mg/0.025 mL were included. The IOP of all participants was measured prior to administering the injection and subsequently at 2 min, 1 h, 1 day, and 1 week thereafter.Results: We included 30 eyes (10 boys and 5 girls) with ROP. For the male group, the mean birth weight, mean gestational age at birth, and the mean time of postmenstrual age (PMA) at IVC treatment were 1,174.0 ± 446.0 g, 28.4 ± 3.0 weeks, and 37.1 ± 1.6 weeks, respectively; for the female group, they were 1,108 ± 285.5 g, 28.2 ± 2.5 weeks, and 36.8 ± 2.1 weeks, respectively. For the male group, the IOP at baseline, 2 min, 1 h, 1 day, and 1 week after IVC were 12.4 ± 1.5 mmHg, 49.0 ± 3.1 mmHg, 26.3 ± 2.5 mmHg, 13.4 ± 2.2 mmHg, and 11.6 ± 1.7 mmHg, respectively; for the female group, they were 10.7 ± 2.0 mmHg, 47.3 ± 3.2 mmHg, 26.4 ± 3.2 mmHg, 10.7 ± 1.8 mmHg, and 10.2 ± 1.8 mmHg, respectively. In both groups, the IOP immediately (2 min) after the operation was significantly higher than that at any other time point (p < 0.01). IOP values returned to the preoperative baseline level on the first day after surgery, with no significant difference compared with that before injection (p > 0.05). IOP continued to be maintained at the preoperative baseline level on the first week after surgery, with no significant difference compared with that before surgery (p > 0.05).Conclusion: Infants with ROP who received IVC experienced a sharp increase in the IOP immediately after injection, which decreased to below 30 mmHg after 1 h and maintain that level for 1 week or longer.

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Section: Discussionmentioning

confidence: 99%

Intraocular pressure effect of intravitreal conbercept injection for retinopathy of prematurity

Gao

Zhao

et al. 2023

Front. Pharmacol.

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“…central corneal thickness, corneal hysteresis, corneal curvature, and corneal rigidity factor) could influence IOP measurements. 53 – 55 Additionally, a previous experiment used the retrograde transport method and observed occasionally labeled neurons in the SCG by applying horseradish peroxidase-wheat germ agglutinin to the central cornea of rats. 56 This implied that SCG electrostimulation might change the biomechanical properties of the cornea, influencing the IOP readings.…”

Section: Discussionmentioning

confidence: 99%

Effect of Electrical Stimulation of Cervical Sympathetic Ganglia on Intraocular Pressure Regulation According to Different Circadian Rhythms in Rats

Luo

Meng

et al. 2020

Invest. Ophthalmol. Vis. Sci.

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The purpose of this study was to investigate the relationship between circadian rhythm and intraocular pressure (IOP), and to explore whether electrical stimulation of cervical sympathetic ganglia (SCG) can regulate IOP via neurotransmitter distribution around the Schlemm's canal (SC) in rats. METHODS. Sprague Dawley rats were housed under normal (N-normal), constant dark (N-dark), and constant light (N-light) rhythms (n = 6 per group). Electrical stimulation (intermittent wave [20 hertz {Hz}, 2 mA, 10 minutes]) was used to stimulate the SCG. Atropine sulfate eye gel was applied three times a day. DiI was injected into the SCG and anterior chamber. The cross-sectional area and circumference of SC were evaluated using hematoxylin-eosin staining. Immunofluorescence staining was used to evaluate dopamine-β-hydroxylase (DβH) expression in SC endothelial (SCE) cells. RESULTS. N-Dark increased the IOP, decreased the cross-sectional area of SC, and increased DβH levels in SCE cells. Nerve projection between SC and SCG was detected, and electrical stimulation of SCG upregulated DβH expression in SCE cells. Under normal and constant light rhythms, electrical stimulation of SCG increased DβH and decreased the cross-sectional area and circumference of SC, while simultaneously increasing IOP and decreasing IOP fluctuations. After paralyzing the ciliary muscles, electrical stimulation of SCG decreased the cross-sectional area and circumference of SC under normal and constant light rhythms. CONCLUSIONS. N-Dark increased DβH in SCE cells, reduced the cross-sectional area of SC, and increased IOP. Under the normal and light rhythms, electrical stimulation of SCG increased DβH in SCE cells, reduced the cross-sectional area and circumference of SC, and in turn elevated IOP and decreased IOP fluctuations.

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“…STU used this artificial eye as one of the transfer-standards in the mentioned above eyetonometry comparison. In a separate study, UPOL collected and evaluated the IOP data using rebound and non-contact tonometers accompanied with the respective cornea properties data [10]. According to the previous literature review, the results indicate that the measurement of intraocular pressure using rebound and non-contact tonometers is influenced by corneal hysteresis and corneal thickness.…”

Section: Emerging Techniquesmentioning

confidence: 99%

Metrology for intraocular pressure measurements

et al. 2020

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The World Health Organization reports glaucoma as the second leading cause of blindness and the leading cause of irreversible blindness. Intraocular hypertension is the most relevant and only treatable risk factor for the disease. Non-invasive intraocular-pressure (IOP) measurements, carried out using eye tonometers, are used to screen for the intraocular hypertension. A correct measurement of the IOP is essential in the prevention and the fight against glaucoma. The authors present their work towards ensuring on one side the accuracy of IOP measurements for contact and non-contact tonometers in the Central European region and obtaining a harmonization of the requirements for IOP metrology at national level.

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The Influence of the Cornea on Intraocular Pressure Measurement by ICARE PRO and ORA

Cited by 4 publications

References 35 publications

Intraocular pressure effect of intravitreal conbercept injection for retinopathy of prematurity

Intraocular pressure effect of intravitreal conbercept injection for retinopathy of prematurity

Effect of Electrical Stimulation of Cervical Sympathetic Ganglia on Intraocular Pressure Regulation According to Different Circadian Rhythms in Rats

Metrology for intraocular pressure measurements

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