Dependence of dynamic contour and Goldmann applanation tonometries on peripheral corneal thickness

Saenz-Frances, Federico; Sanz-Pozo, Claudia; Borrego-Sanz, Lara; Jáñez, Luis; Morales-Fernández, Laura; Martinez-de-la-Casa, José M.; García–Sánchez, J.; García‐Feijoó, Julián; Santos-Bueso, E.

doi:10.18240/ijo.2017.10.07

Cited by 6 publications

(8 citation statements)

References 38 publications

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“…However, as IOP is measured through the cornea, readings are affected by characteristics of the cornea such as corneal curvature, thickness and biomechanics [ 4 , 5 ]. Measurements of central corneal thickness (CCT) and corneal biomechanical properties such as corneal hysteresis provide useful additional information for risk profiling but also have a confounding effect on the measurement of IOP [ 2 , 6 , 7 , 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

“…Goldmann applanation tonometry (GAT) remains widely regarded as the gold standard method of IOP measurement [ 6 , 11 , 12 , 13 , 14 , 15 ], but a range of newer devices are available including non-contact tonometry (NCT), rebound tonometry (RT) and dynamic contour tonometry (DCT) [ 6 , 7 , 8 , 9 , 11 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ]. NCT uses an air puff that deforms the cornea, with the advantage of not requiring anesthetic eye drops [ 8 , 21 , 26 , 29 ]; RT assesses IOP by firing a small plastic-tipped probe at the surface of the cornea, with the speed at which the probe returns to its initial position providing information on IOP [ 22 , 23 , 30 , 31 , 32 ]; and DCT uses a slit lamp mounted device containing a pressure sensor.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Corneal Thickness, Densitometry and Curvature on Intraocular Pressure Measurements Obtained by Applanation, Rebound and Dynamic Contour Tonometry

Junior

Augusto²,

Gracitelli

et al. 2020

Vision

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Evaluate the effect of corneal thickness, densitometry and curvature on intraocular pressure (IOP) measurements obtained by Goldmann applanation tonometry (GAT), non-contact tonometry (NCT), rebound tonometry (RT), and dynamic contour tonometry (DCT). A cross-sectional prospective study involving 40 participants was performed. Corneal measurements were obtained using Pentacam (Oculus GMbH, Wetzlar, Germany), densitometry was measured at annuli of 0–2, 2–6, 6–10 and 10–12 mm. The relationship between corneal thickness (central, 4 and 6 mm), corneal astigmatism and corneal densitometry and IOP was examined. There was a significant relationship between corneal thickness (central, 4 and 6 mm) and GAT180, GAT90, RT, and NCT (P < 0.001 for all comparisons) but not for DCT. Higher corneal densitometry (6–10 mm and 10–12 mm zones) was associated with higher IOP from GAT180 and GAT90, and higher densitometry in the 6–10 mm zone correlated with higher IOP from NCT, however corneal densitometry increased with age. Accounting for age, the relationship between corneal densitometry and IOP measurements was not significant. In eyes with greater corneal astigmatism there was a greater difference between GAT90 and GAT180 measurements. IOP measurements may be affected by corneal thickness, densitometry and curvature. DCT was less affected by properties of the cornea compared to other devices.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Effect of Corneal Thickness, Densitometry and Curvature on Intraocular Pressure Measurements Obtained by Applanation, Rebound and Dynamic Contour Tonometry

Junior

Augusto²,

Gracitelli

et al. 2020

Vision

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“…For example, for such defined vibrations, a comparative analysis with patients with keratoconus or glaucoma can be performed. Any change in the biomechanical conditions of the cornea and in particular corneal thickness [ 32 , 80 – 86 ] affects the measured biomechanical parameters of vibrations. Evaluation of the effect of these diseases on the obtained results and their diagnostic usefulness will be the subject of subsequent authors' papers.…”

Section: Discussionmentioning

confidence: 99%

Corneal Vibrations during Intraocular Pressure Measurement with an Air-Puff Method

Koprowski

Wilczyński

2018

Journal of Healthcare Engineering

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Introduction The paper presents a commentary on the method of analysis of corneal vibrations occurring during eye pressure measurements with air-puff tonometers, for example, Corvis. The presented definition and measurement method allow for the analysis of image sequences of eye responses—cornea deformation. In particular, the outer corneal contour and sclera fragments are analysed, and 3D reconstruction is performed. Methods On this basis, well-known parameters such as eyeball reaction or corneal response are determined. The next steps of analysis allow for automatic and reproducible separation of four different corneal vibrations. These vibrations are associated with (1) the location of the maximum of cornea deformation; (2) the cutoff area measured in relation to the cornea in a steady state; (3) the maximum of peaks occurring between applanations; and (4) the other characteristic points of the corneal contour. Results The results obtained enable (1) automatic determination of the amplitude of vibrations; (2) determination of the frequency of vibrations; and (3) determination of the correlation between the selected types of vibrations. Conclusions These are diagnostic features that can be directly applied clinically for new and archived data.

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“…Elena JORDANOVA 1 , Paraskeva HENTOVA-SENCANIC 2 , Ivan MARJANOVIC 3,4 , Ivan SENCANIC, Ivana STEFANOVIC 6 , Marko BARALIC 7…”

Section: Original Articleunclassified

“…Tetrakain hlorid 1%. Vršena su tri uzastopna merenja, na ekranu pahimetra očitavana je srednja vrednost CCT izražene u μm [3,6]. Izvršena je podela vrednosti CCT u tri podgrupe: tanka rožnjača (485-519 μm), rožnjača srednje debljine (520 do 589 μm) i debela rožnjača od 590-684 μm.…”

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The impact of central corneal thickness on values of intraocular pressure measured using two methods: Goldmann applanation and dynamic contour tonometry in patients with open-angle glaucoma

Jordanova¹,

Hentova-Sencanic²,

Marjanović³

et al. 2020

NČ urgent medic Halo 194

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Uvod/clij Dinamička konturna tonometrija (DCT) je kontaktna, neaplanaciona metoda merenja IOP-a. Cilj studije je bio da se utvrdi uticaj centralne deblije rožnjače (CCT) na visinu IOP-a izmerenog dvema metodama: GAT i DCT kod obolelih od glaukoma otvorenog ugla. Metode Studija je obuhvatila 150 ispitanika (300 očiju) sa dijagnozom primarnog glaukoma otvorenog ugla (54 muškaraca) prosečne starosti 59,39 ± 13,12 godina. IOP je meren dvema metodama: Goldmanova aplanaciona tonometrija (GAT) i dinamička konturna tonometrija (DCT). Određivana je CCT (ultrazvučni pahimetar). DCT uvodi još jednu vrednost-okularnu pulsnu amplitudu (OPA). Rezultati IOP izmeren GAT metodom bio je niži u poređenju sa IOP-om izmerenim DCT metodom (17,71 ± 3,35 mmHg vs 19,80 ± 3,67 mmHg). Povezanost IOP-a izmerenog GAT metodom sa IOP-a izmerenim DCT metodom bila je visoko statistički značajna pozitivnog smera (r= 0,867; p< 0,01). Povezanost CCT sa IOP-om izmernim GAT metodom kod svih ispitanika bila je visoko statistički značajna (r=0,198; p< 0,01), dok je povezanost CCT sa IOP-om izmernim DCT metodom bila statistički značajna (r=0,180; p< 0,05). Pri promeni CCT za svakih 10 μm dolazi do promene IOP-a izmerenog GAT metodom za 0,3 mmHg, dok je prosečna promena IOP-a izmerenog DCT metodom za 0,4 mmHg. CCT je visoko statistički značajno pozitivno korelirala sa OPA (r=0,204; p< 0,01). Povezanost OPA sa IOP-om izmerenog GAT metodom (r= 0,393; p< 0,01) i IOP-om izmerenog DCT metodom (r=0,452; p< 0,01) bila je visoko statistički značajna pozitivnog smera. Zaključak IOP izmeren GAT metodom bio je niži u poređenju sa IOP-om izmerenim DCT metodom. CCT je imala uticaj na IOP izmeren obema metodama: GAT I DCT. Uticaj CCT na IOP-a izmeren DCT metodom bio je niži u poređenju sa uticajem CCT na IOP izmeren GAT metodom. Ključne reči: centralna debljina rožnjače, dinamički konturni tonometar, okularna pulsna amplituda. Uvod Glaukom je masovna, nezarazna bolest, čija pojava ne može da se spreči. Ali, pravovremeno dijagnostikovan, uspešno se kompenzuje medikamentnim i hirurškim metodama. Glaukom nelečen ili neadekvatno lečen u konačnom ishodu dovodi do slepila [1]. Rana dijagnoza glaukoma je od izuzetnog značaja u prevenciji progresije ove bolesti. Jedna od osnovih metoda za postavljanje dijagnoze glukoma je tonometrija-metoda merenja intraokularnog pritiska (IOP-a) [2]. U svakodnevnoj oftalmološkoj praksi standard za merenje IOP-a predstavlja Goldmanova aplanaciona

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Dependence of dynamic contour and Goldmann applanation tonometries on peripheral corneal thickness

Abstract: DCT and GAT measurements are conditioned by PCT though this effect, rather than linear, follows a 2-degree polynomial pattern.

Cited by 6 publications

References 38 publications

The Effect of Corneal Thickness, Densitometry and Curvature on Intraocular Pressure Measurements Obtained by Applanation, Rebound and Dynamic Contour Tonometry

The Effect of Corneal Thickness, Densitometry and Curvature on Intraocular Pressure Measurements Obtained by Applanation, Rebound and Dynamic Contour Tonometry

Corneal Vibrations during Intraocular Pressure Measurement with an Air-Puff Method

The impact of central corneal thickness on values of intraocular pressure measured using two methods: Goldmann applanation and dynamic contour tonometry in patients with open-angle glaucoma

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