April 2010
Volume 51, Issue 13
Free
ARVO Annual Meeting Abstract  |   April 2010
RIGITEST - A New Method to Estimate Corneal Hysteresis? A Comparison Between Normal Subjects vs. Keratoconus Patients
Author Affiliations & Notes
  • V. R. Couto
    Santa Casa de Belo Horizonte - MG, Belo Horizonte, Brazil
  • L. Gontijo
    Ophtalmology,
    Santa Casa de Belo Horizonte - MG, Belo Horizonte, Brazil
  • F. N. Kanadani
    Ophthalmology/Glaucoma, New York Eye and Ear Infirmary, Belo Horizonte, Brazil
  • A. D. C. Gontijo
    Medicine, Faculdade da Saude e Ecologia Humana, Belo Horizonte, Brazil
  • S. K. Dorairaj
    Glaucoma, Einhorn Rsch Center, NYEE, New York, New York
  • Footnotes
    Commercial Relationships  V.R. Couto, None; L. Gontijo, None; F.N. Kanadani, None; A.D.C. Gontijo, None; S.K. Dorairaj, None.
  • Footnotes
    Support  None.
Investigative Ophthalmology & Visual Science April 2010, Vol.51, 4988. doi:
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      V. R. Couto, L. Gontijo, F. N. Kanadani, A. D. C. Gontijo, S. K. Dorairaj; RIGITEST - A New Method to Estimate Corneal Hysteresis? A Comparison Between Normal Subjects vs. Keratoconus Patients. Invest. Ophthalmol. Vis. Sci. 2010;51(13):4988.

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

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Abstract
 
Purpose:
 

To describe the RIGITEST, a possible new method to estimate corneal hysteresis. To compare the corneal hysteresis between controls and keratoconus patients.

 
Methods:
 

Based on intraocular pressure (IOP) measurements by applanation (GAT) and Dynamic contour tonometry (DCT), the rigitest was calculated as [GAT/DCT-1.5]. 57 eyes of 57 patients (30 emmetropes, 27 keratoconus patients) were prospectively enrolled for this study. GAT measurements were taken 10 minutes before DCT, both were performed in sitting position. Keratoconus was determined using corneal topography and keratometry. The mean value of 2 measurements from the right eye of each patient was calculated and compared using t-Test. P values < 0.05 were considered statistical significant.

 
Results:
 

Keratoconus patients had thinner corneal thickness [mean ± SD][485.7 ± 49.0 vs 566.0 ± 40.2 µ; p <0.001], lower GAT [12.2 ± 3.3 vs 17.2 ± 3.8 mmHg; p<0.001], lower DCT [14.3 ± 1.9 vs 17.3 ± 3.2 mmHg; p< 0.001] and lower rigitest [0.9 ± 0.2 vs 1.1 ± 0.1; p<0.001] compared to normal subjects.

 
Conclusions:
 

Keratoconus eyes demonstrated thinner corneas and lower IOP measurements on GAT and DCT compared to normal eyes. In concordance with the pathophysiology of Keratoconus, these eyes demonstrated a decreased corneal hysteresis calculated by RIGITEST.  

 
Keywords: keratoconus • refractive surgery 
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