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Monday / May 20.


The Reichert Ocular Response Analyzer (ORA) G3 is the only tonometer that measures corneal hysteresis (CH), a superior predictor of glaucoma progression. Corneal hysteresis is an indication of the biomechanical properties of the cornea differing from thickness or topography, which are geometrical attributes.

CH measurements are significantly associated with risk of glaucoma progression. A study showed that eyes with lower CH had faster rates of visual field loss than those with higher CH.1

The ORA also provides Corneal Compensated Intraocular Pressure (IOPcc), a better indication of the true pressure, proven to be less influenced by corneal properties than Goldmann or other methods of tonometry.2

Contact: BOC Instruments (AUS) 1800 804 331

1 – Medeiros FA, Meira-Freitas D, Lisboa R, Kuang TM, Zangwill LM, Weinreb RN. Corneal hysteresis as a risk factor for glaucoma progression: a prospective longitudinal study. Ophthalmology. 2013 Aug;120(8):1533-40.
2 – Felipe A. Medeiros, MD and Robert N. Weinreb, MD. Evaluation of the Influence of
Corneal Biomechanical Properties on Intraocular Pressure Measurements Using the Ocular Response Analyzer. J Glaucoma 2006;15:364–370.