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Journals / Glokom Katarakt / 2009 / Cilt: 4 - Sayı: 4

The relationship between dynamic contour tonometer and central corneal thickness

Dinamik kontur tonometri ve santral korneal kalınlık ilişkisi

İlker ESER
Barış AKÖMÜR
Ezgi YILMAZ
ARZU TAŞKIRAN ÇÖMEZ
Pages
216–220
DOI
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Discussion: DCT seemed less effected from CCT especially in corneas thinner than 510 μm, resulting more correct measurements, however especially in eyes with corneas thicker than 540 μm, the results of measurements could be very similar to those results of GAT.We conclude that, in thin corneas on which it is not possible to form a nomogram according to CCT,1-2 mmHg addition could be done to the measurements obtained by GAT; however, we think that this should be confirmed by following studies with larger series.

📌 3 Key Takeaways

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Objective & Hypothesis:Purpose: To investigate the relationship between intraocular pressure (IOP) measured by Pascal Dynamic Contour Tonometry (DCT) and central corneal thickness (CCT).
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Key Findings & Data:Materials and Methods: A hundred-sixteen eyes of 58 glaucoma suspected or healthy subjects (23 male,35 female) with a mean age of 48.2±13.3 years were included in the study.After CCTs of all eyes measured by Ultrasonic pachymeter (NidekUS-4000,Japan), IOP was measured by DCT (Ziemer Group,Switzerland), then, by Goldmann Applanation Tonometer (GAT), (Optilasa,Spain).
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Conclusion & Impact:Discussion: DCT seemed less effected from CCT especially in corneas thinner than 510 μm, resulting more correct measurements, however especially in eyes with corneas thicker than 540 μm, the results of measurements could be very similar to those results of GAT.We conclude that, in thin corneas on which it is not possible to form a nomogram according to CCT,1-2 mmHg addition could be done to the measurements obtained by GAT; however, we think that this should be confirmed by following studies with larger series.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Domain Parameters

Abstract

Purpose: To investigate the relationship between intraocular pressure (IOP) measured by Pascal Dynamic Contour Tonometry (DCT) and central corneal thickness (CCT). Materials and Methods: A hundred-sixteen eyes of 58 glaucoma suspected or healthy subjects (23 male,35 female) with a mean age of 48.2±13.3 years were included in the study.After CCTs of all eyes measured by Ultrasonic pachymeter (NidekUS-4000,Japan), IOP was measured by DCT (Ziemer Group,Switzerland), then, by Goldmann Applanation Tonometer (GAT), (Optilasa,Spain). The relationship between measurements of these two tonometers and CCT was evaluated for statistical significance by Pearson correlation analysis. Results: The mean value of CCT measurements was found to be 541.1±41.0(455-635) μm. Mean IOPs measured by DCT and GAT were; 19.6±3.3(12.6-29.4) mmHg and 18.5±3.1(12-28) mmHg, respectively. Although the mean difference between two devices was found to be, 1.1(-5.7 - +7.3) mmHg, it was seen that IOP differences obtained from both devices were decreasing while CCTs were increasing(r=-0.205, p=0.03), (Pearson correlation analysis).In 27 eyes in which CCT was thinner than 517 μm, the differences were always cut in favour of DCT device, while the values obtained from both devices could be higher in eyes with CCTs especially thicker than 540 μm. Discussion: DCT seemed less effected from CCT especially in corneas thinner than 510 μm, resulting more correct measurements, however especially in eyes with corneas thicker than 540 μm, the results of measurements could be very similar to those results of GAT.We conclude that, in thin corneas on which it is not possible to form a nomogram according to CCT,1-2 mmHg addition could be done to the measurements obtained by GAT; however, we think that this should be confirmed by following studies with larger series.

Özet

Amaç: Pascal dinamik kontur tonometre (DKT) ile ölçülen göz içi basınç (GİB)'larının santral kornea kalınlığı (SKK) ile ilişkisini araştırmak. Gereç ve Yöntem: Ortalama yaşları 48.2±13.3 olan glokom şüphesi nedeni ile takip edilen veya sağlıklı olan 58 olgunun (23 erkek 35 kadın) 116 gözü çalışmaya dahil edildi. Ultrasonik pakimetre (Nidek US-4000, Japonya) ile tüm gözlerin SKK ölçümü yapıldıktan sonra, GİB ölçümü önce DKT (Ziemer Group, İsviçre), sonrasında Goldmann applanasyon tonometresi (GAT) (Optilasa, İspanya) ile yapıldı. Bu tonometrelerin ölçümleri ile SKK arasında ilişki olup olmadığı Pearson korelasyon analizi ile istatistiksel olarak değerlendirildi. Bulgular: SKK ortalaması 541.1±41.0 (455-635) μm bulundu. Ortalama GİB'ları DKT ile 19.6±3.3 (12.6-29.4) mmHg, GAT ile 18.5±3.1 (12-28) mmHg idi. Cihazlar arasındaki ortalama fark 1,1 (-5.7-+7.3) mmHg bulunurken, SKK arttıkça her iki cihazdan elde edilen GİB farkının azaldığı görüldü (r=-0.205, p=0.03), (Pearson korelasyon analizi). SKK'ın 517 μm'dan daha ince olduğu 23 gözde aradaki fark hep DKT lehine iken, özellikle 540 μm'nin üzerinde her iki cihazdan alınan değerlerin de yüksek olabildiği görüldü. Sonuç: DKT'in özellikle 510 μm'den ince kornealarda genellikle SKK'dan daha az etkilenerek daha doğru sonuçlar verebileceği ancak özellikle 540 μm'dan daha kalın kornealı gözlerde ölçüm sonuçlarının GAT değerlerine yakın çıkabileceği izlendi. SKK'ına göre nomogram yapmanın elimizdeki verilerle pek mümkün olmadığı, ince kornealarda GAT ile elde edilen ölçümlere 1-2 mmHg eklenebileceği ancak bu durumun daha geniş sayıda hastalarla yapılacak çalışmalarla desteklenmesi gerektiğini düşünmekteyiz.

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Cite This Article

ESER, İ., AKÖMÜR, B., YILMAZ, E., ÇÖMEZ, A. T. (2009). The relationship between dynamic contour tonometer and central corneal thickness. Glokom Katarakt, Cilt: 4 - Sayı: 4, 216–220. https://ajindex.com/articles/226617

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