top of page


Manufacturer: Reichert
Product code: DSG3

Make a more confident glaucoma risk assessment, with Corneal Hysteresis.


The Ocular Response Analyzer® (ORA) is the only non contact 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 were significantly associated with risk of glaucoma progression. Eyes with lower CH had faster rates of visual field loss than those with higher CH.”1

In addition to Corneal Hysteresis, Ocular Response Analyser 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.

Despite improvements in treatment options, Glaucoma remains a leading cause of blindness with no cure.  Diagnosing and predicting glaucoma progression is challenging due to the wide variety of risk factors, all with relatively low specificity.  As such, it is essential that we consider glaucoma to be a multi-factorial disease with numerous risk factors that should be taken into account. 


The Ocular Hypertension Treatment Study (OHTS) put central corneal thickness (CCT) on the map due to the surprise finding that CCT was independently and strongly related to glaucoma risk.  This was the first time that a corneal parameter was shown to be related to development of glaucoma.  Now, we have ample evidence that Corneal Hysteresis (CH) is even more important that CCT in the assessment of glaucoma risk.


Studies have shown CH measurements are significantly, and independently, associated with glaucoma risk.  Eyes with lower CH tend to progress more rapidly.  Prospective longitudinal studies have demonstrated that baseline CH predicts the rate of future visual field loss in glaucoma suspects and patients.  The biggest challenge in managing glaucoma is predicting future progression.  It typically takes 5-6 visual field test results over a period of months or years to establish progression rates. Different glaucoma patients with similar risk factors may progress at dramatically different rates. This is unnerving to patients and clinicians alike. Ideally we would allocate resources to those who require it most.


Since CH has been shown to be more predictive of future visual field progression than other factors, including this parameter in assessment of glaucoma risk will improve glaucoma decision making and facilitate earlier intervention to improve visual outcomes.


  • Dimensions: 50.2 W x 26.7 H x 35.6 cm D (19.75 x 10.5 x 14 in.) 

  • Weight: 10.4 kg (23 lbs) 

  • Voltage: 100/240 VAC Frequency 50/60 Hz 

  • Measurement Range: 7 - 60 mmHg (ISO 8612 tonometer standard) 

  • Communication Port: RS-232

bottom of page