Posters

Limitations in rebound tonometry and efficacy of limbal probe position in estimating intraocular pressure

Poster Details

First Author: G.Bontzos GREECE

Co Author(s): Z. Kapsala   E. Detorakis                 

Abstract Details

Purpose:

The accuracy of tonometry may be compromised in disorders affecting central corneal bio-mechanical properties. We explore the limitations of classic tonometric techniques and evaluate an alternative method to estimate intraocular pressure by switching the tonometer position to the cornea-scleral limbus.

Setting:

Prospective cross-sectional study and brief review of literature at the University Hospital of Heraklion, Crete, Greece.

Methods:

Consecutive cataract surgery candidates without concomitant ocular pathology, apart from cataract, were included. Intraocular pressure was measured using Goldmann applanation tonometry and Rebound tonometry, which was performed on the central cornea as well as on the limbus and scleral spur area. Findings were correlated with axial length, central corneal thickness, and corneal curvature measurements.

Results:

Limbal rebound tonometry readings were associated with respective central readings (r = 0.91, P < 0.001) and with Goldmann applanation tonometry readings (r=0.864, P < 0.001), whereas correlations with other parameters examined were not statistically significant.

Conclusions:

In clinical practice, the accuracy of intraocular pressure measurements is often compromised in cases of structural corneal changes such as keratoconus, distorted surfaces after trauma or keratoprothesis. Limbal rebound tonometry may be used as an alternative tool in clinical practice to determine intraocular pressure when conventional devices and techniques might be inadequate or unreliable.

Financial Disclosure:

None