Ocuton-S self tonometry vs. Goldmann tonometry; a diurnal comparison study

Péter Kóthy, P. Vargha, G. Holló

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Purpose: To compare 24-hour diurnal intraocular pressure (IOP) measurements obtained using the Ocuton-S applanation self tonometer and the Goldmann tonometer. Methods: 24-hour diurnal IOP curves were obtained on 14 eyes of 7 trained patients suffering from medically controlled primary open angle glaucoma. IOP was measured every third hour starting at 9 a.m. with a calibrated Goldmann tonometer; one week later, a similar set of measurements was obtained with Ocuton-S self tonometry by the patients. One week later still, ultrasound corneal pachymetry was performed at the same hours. Results: Overall IOP (24-hour mean) did not differ significantly between the different measuring techniques (ANOVA, p=0.74), but the IOP differed in a statistically significant manner around the clock (ANOVA, p=0.00006). The mean Goldmann tonometric readings were up to 2.8 mmHg lower than the Ocuton-S values during the daytime (9 a.m. to 9 p.m.), however, during the night (12 midnight to 6 a.m.) mean IOP measured with Goldmann tonometry was 2.2 to 3.3 mmHg higher than the corresponding average of the self tonometry readings. There was a statistically significant interaction between the type of tonometry and the time of the measurement (p=0.0007). Central corneal thickness (CCT) showed a significant change during the 24-hour period (p=0.000001). Conclusion: IOP shows a different diurnal curve when measured with the Goldmann tonometer and with the Ocuton-S applanation self tonometer. The instruments' readings might be influenced in different ways by the diurnal changes of the corneal thickness. Since Ocuton-S self tonometry underestimates the IOP in the early morning period, a careful evaluation is necessary when nocturnal and early morning IOP elevation is investigated with this technique.

Original languageEnglish
Pages (from-to)294-297
Number of pages4
JournalActa Ophthalmologica Scandinavica
Volume79
Issue number3
DOIs
Publication statusPublished - 2001

Fingerprint

Manometry
Intraocular Pressure
Reading
Analysis of Variance
Corneal Pachymetry

Keywords

  • Applanation tonometry
  • Corneal thickness
  • Diurnal intraocular pressure curve
  • Glaucoma
  • Ocuton-S tonometer
  • Self-tonometry

ASJC Scopus subject areas

  • Ophthalmology

Cite this

Ocuton-S self tonometry vs. Goldmann tonometry; a diurnal comparison study. / Kóthy, Péter; Vargha, P.; Holló, G.

In: Acta Ophthalmologica Scandinavica, Vol. 79, No. 3, 2001, p. 294-297.

Research output: Contribution to journalArticle

@article{914a9645ccd840cbb4049dea0e11ac2b,
title = "Ocuton-S self tonometry vs. Goldmann tonometry; a diurnal comparison study",
abstract = "Purpose: To compare 24-hour diurnal intraocular pressure (IOP) measurements obtained using the Ocuton-S applanation self tonometer and the Goldmann tonometer. Methods: 24-hour diurnal IOP curves were obtained on 14 eyes of 7 trained patients suffering from medically controlled primary open angle glaucoma. IOP was measured every third hour starting at 9 a.m. with a calibrated Goldmann tonometer; one week later, a similar set of measurements was obtained with Ocuton-S self tonometry by the patients. One week later still, ultrasound corneal pachymetry was performed at the same hours. Results: Overall IOP (24-hour mean) did not differ significantly between the different measuring techniques (ANOVA, p=0.74), but the IOP differed in a statistically significant manner around the clock (ANOVA, p=0.00006). The mean Goldmann tonometric readings were up to 2.8 mmHg lower than the Ocuton-S values during the daytime (9 a.m. to 9 p.m.), however, during the night (12 midnight to 6 a.m.) mean IOP measured with Goldmann tonometry was 2.2 to 3.3 mmHg higher than the corresponding average of the self tonometry readings. There was a statistically significant interaction between the type of tonometry and the time of the measurement (p=0.0007). Central corneal thickness (CCT) showed a significant change during the 24-hour period (p=0.000001). Conclusion: IOP shows a different diurnal curve when measured with the Goldmann tonometer and with the Ocuton-S applanation self tonometer. The instruments' readings might be influenced in different ways by the diurnal changes of the corneal thickness. Since Ocuton-S self tonometry underestimates the IOP in the early morning period, a careful evaluation is necessary when nocturnal and early morning IOP elevation is investigated with this technique.",
keywords = "Applanation tonometry, Corneal thickness, Diurnal intraocular pressure curve, Glaucoma, Ocuton-S tonometer, Self-tonometry",
author = "P{\'e}ter K{\'o}thy and P. Vargha and G. Holl{\'o}",
year = "2001",
doi = "10.1034/j.1600-0420.2001.790317.x",
language = "English",
volume = "79",
pages = "294--297",
journal = "Acta Ophthalmologica",
issn = "1755-375X",
publisher = "Wiley-Blackwell",
number = "3",

}

TY - JOUR

T1 - Ocuton-S self tonometry vs. Goldmann tonometry; a diurnal comparison study

AU - Kóthy, Péter

AU - Vargha, P.

AU - Holló, G.

PY - 2001

Y1 - 2001

N2 - Purpose: To compare 24-hour diurnal intraocular pressure (IOP) measurements obtained using the Ocuton-S applanation self tonometer and the Goldmann tonometer. Methods: 24-hour diurnal IOP curves were obtained on 14 eyes of 7 trained patients suffering from medically controlled primary open angle glaucoma. IOP was measured every third hour starting at 9 a.m. with a calibrated Goldmann tonometer; one week later, a similar set of measurements was obtained with Ocuton-S self tonometry by the patients. One week later still, ultrasound corneal pachymetry was performed at the same hours. Results: Overall IOP (24-hour mean) did not differ significantly between the different measuring techniques (ANOVA, p=0.74), but the IOP differed in a statistically significant manner around the clock (ANOVA, p=0.00006). The mean Goldmann tonometric readings were up to 2.8 mmHg lower than the Ocuton-S values during the daytime (9 a.m. to 9 p.m.), however, during the night (12 midnight to 6 a.m.) mean IOP measured with Goldmann tonometry was 2.2 to 3.3 mmHg higher than the corresponding average of the self tonometry readings. There was a statistically significant interaction between the type of tonometry and the time of the measurement (p=0.0007). Central corneal thickness (CCT) showed a significant change during the 24-hour period (p=0.000001). Conclusion: IOP shows a different diurnal curve when measured with the Goldmann tonometer and with the Ocuton-S applanation self tonometer. The instruments' readings might be influenced in different ways by the diurnal changes of the corneal thickness. Since Ocuton-S self tonometry underestimates the IOP in the early morning period, a careful evaluation is necessary when nocturnal and early morning IOP elevation is investigated with this technique.

AB - Purpose: To compare 24-hour diurnal intraocular pressure (IOP) measurements obtained using the Ocuton-S applanation self tonometer and the Goldmann tonometer. Methods: 24-hour diurnal IOP curves were obtained on 14 eyes of 7 trained patients suffering from medically controlled primary open angle glaucoma. IOP was measured every third hour starting at 9 a.m. with a calibrated Goldmann tonometer; one week later, a similar set of measurements was obtained with Ocuton-S self tonometry by the patients. One week later still, ultrasound corneal pachymetry was performed at the same hours. Results: Overall IOP (24-hour mean) did not differ significantly between the different measuring techniques (ANOVA, p=0.74), but the IOP differed in a statistically significant manner around the clock (ANOVA, p=0.00006). The mean Goldmann tonometric readings were up to 2.8 mmHg lower than the Ocuton-S values during the daytime (9 a.m. to 9 p.m.), however, during the night (12 midnight to 6 a.m.) mean IOP measured with Goldmann tonometry was 2.2 to 3.3 mmHg higher than the corresponding average of the self tonometry readings. There was a statistically significant interaction between the type of tonometry and the time of the measurement (p=0.0007). Central corneal thickness (CCT) showed a significant change during the 24-hour period (p=0.000001). Conclusion: IOP shows a different diurnal curve when measured with the Goldmann tonometer and with the Ocuton-S applanation self tonometer. The instruments' readings might be influenced in different ways by the diurnal changes of the corneal thickness. Since Ocuton-S self tonometry underestimates the IOP in the early morning period, a careful evaluation is necessary when nocturnal and early morning IOP elevation is investigated with this technique.

KW - Applanation tonometry

KW - Corneal thickness

KW - Diurnal intraocular pressure curve

KW - Glaucoma

KW - Ocuton-S tonometer

KW - Self-tonometry

UR - http://www.scopus.com/inward/record.url?scp=0034971323&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0034971323&partnerID=8YFLogxK

U2 - 10.1034/j.1600-0420.2001.790317.x

DO - 10.1034/j.1600-0420.2001.790317.x

M3 - Article

C2 - 11401642

AN - SCOPUS:0034971323

VL - 79

SP - 294

EP - 297

JO - Acta Ophthalmologica

JF - Acta Ophthalmologica

SN - 1755-375X

IS - 3

ER -