May 2008
Volume 49, Issue 13
Free
ARVO Annual Meeting Abstract  |   May 2008
Correlation Between I-Care and Tonopen-XL With Goldmann Applanation Tonometer and the Influence of Pachymetry Over These Two Methods
Author Affiliations & Notes
  • G. M. Vieira
    Glaucoma, Brasilia GlaucomaCenter, Brasilia, Brazil
    Ophthalmology, Uniplac School of Medicine, Brasília, Brazil
  • J. O. Duarte, Jr.
    Ophthalmology, Uniplac School of Medicine, Brasilia, Brazil
  • R. A. Vieira
    Ophthalmology, Uniplac School of Medicine, Brasilia, Brazil
  • Footnotes
    Commercial Relationships  G.M. Vieira, None; J.O. Duarte, None; R.A. Vieira, None.
  • Footnotes
    Support  None.
Investigative Ophthalmology & Visual Science May 2008, Vol.49, 701. doi:https://doi.org/
  • Views
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to authenticated users only.
      Sign In or Create an Account ×
    • Get Citation

      G. M. Vieira, J. O. Duarte, Jr., R. A. Vieira; Correlation Between I-Care and Tonopen-XL With Goldmann Applanation Tonometer and the Influence of Pachymetry Over These Two Methods. Invest. Ophthalmol. Vis. Sci. 2008;49(13):701. doi: https://doi.org/.

      Download citation file:


      © ARVO (1962-2015); The Authors (2016-present)

      ×
  • Supplements
Abstract

Purpose: : : to asses the correlation of intraocular pressure (IOP) measurements obtained from two different methods, the Rebound tonometer (i-care) and the Tono Pen XL (TP), with the Goldmann applanation tonometer (GAT).

Methods: : two hundred sixty nine eyes from 135 consecutive patients were involved in this cross-sectional study. All IOP and pachymetry measurements were made by the same examiner, who was masked to the observed result. I-care tonometry was performed first, followed by TP, GAT and pachymetry in a randomly order.

Results: : one hundred twenty one patients were normal, 12 had ocular hypertension, and two glaucoma. Mean IOP was 16.89, 17.87, and 15.88 mmHg for i-care, TP and GAT respectively. The difference between the measurements obtained with all the three methods was statistically significant (Duncan test, p< .05). There was a good correlation between IOP readings obtained using the i-care and GAT (r = 0.76, p=.00) and between TP and GAT (r = 0.75, p=.00). A Bland-Altman plot indicated that the 95% limits of agreement between TP and GAT were -7.10 to 3.50 mmHg, and between i-care and GAT were -7.01 to 5.0 mmHg. In corneas thinner than 500 µ, the difference between GAT and TP (2.16 mmHg) was statistically significant (Duncan test, p= .73), but not between GAT and i-care (0.26 mmHg, p<.05). In corneas thicker than 560 µ a difference of 1.50 and 1.58 mmHg was obtained between GAT and i-care and between GAT and TP respectively, and both were statistically significant (Duncan test, p=.92).

Conclusions: : both i-care and TP correlates well with GAT, and provide an overestimation of IOP measured by GAT. Tono-Pen XL overestimate IOP obtained by GAT in thinner corneas, and both i-care and TP overestimate IOP obtained by GAT in thicker corneas.

Keywords: intraocular pressure • reading 
×
×

This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.

×