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Corvis ST tonometer yields reliable IOP, central corneal thickness readings
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A new non-contact tonometer provided accurate IOP and central corneal thickness measurements but less accurate corneal deformation measurements, according to a study.
The Corvis ST (Oculus), an automated non-contact air-puff tonometer with ultra-high-speed Scheimpflug technology, measures IOP and corneal pachymetry and provides readings on corneal biomechanical properties.
The prospective, randomized study included one eye of 85 glaucoma patients and 79 healthy controls. The Corvis ST and Goldmann applanation tonometry were used randomly to take three IOP measurements in each eye.
Overall, mean IOP readings were 17.3 mm Hg with GAT and 15.9 mm with Corvis ST.
Among patients with primary open-angle glaucoma, mean IOP readings were 19.1 mm Hg with GAT and 16.5 mm Hg with Corvis ST. Mean IOP readings on controls were 15.5 mm Hg with GAT and 15.2 mm Hg with Corvis ST.
Intermethod correlations between IOP readings were significant (P < .001) for all groups. Intermethod comparisons were significant (P < .001) for the entire study group and POAG subgroup but not for controls.
Correlation coefficients with the Corvis ST ranged from 0.95 to 0.99 for IOP and central corneal thickness and from 0.17 to 0.97 for corneal deformation parameters.
Corneas in glaucoma patients were significantly less deformable than corneas in control subjects (P < .05).
GAT and Corvis ST IOP correlated strongly with central corneal thickness (P < .05) and corneal deformation parameters (P < .001). – by Matt Hasson
Disclosure: The authors report no relevant financial disclosures.
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Salvetat ML, et al. J Glaucoma. 2015;doi:10.1097/IJG.0000000000000133.
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